matlab unrecognized function or variable substr

matlab mcc compiled standalone executable: Unrecognized function or variable, getpts MATLAB returns unrecognized function or variable 'getpts', Fraction-manipulation between a Gamma and Student-t. Why is 51.8 inclination standard for Soyuz? https://www.mathworks.com/help/audio/ref/audiodatastore.html. You cannot find the isfile function in MATLAB R2015. Avoiding alpha gaming when not alpha gaming gets PCs into trouble. Save the file either in the current folder or in a folder on the MATLAB search path. Work your way outward from there. Noida,India, Australia Unrecognized function or variable in Matlab, uk.mathworks.com/matlabcentral/answers/416516-3d-phase-portrait, Flake it till you make it: how to detect and deal with flaky tests (Ep. do so, that documentation page will also tell you how you can. I am facing this error when running y_lambda=lambda: Undefined function or variable 'lambda'. I tried to call this function via matlab.engine but I got the error message: "Undefined function 'sin' for input argument of type 'int64' ". MathWorks is the leading developer of mathematical computing software for engineers and scientists. readgeoraster can return empty R, or a Geographic reference object, or a Map reference object. hi everyone, i hope you'll help me with that, i have the same error "Undefined function or variable, [Q, g, l] = HMMbaumwelch(y, nu, tol, maxIt, Q, g), % HMMbaumwelch compute maximum likehood estimate using Expectation-Maximization, % nu = initial distribution of the hidden chain, % tol = tolerance for the stopping criterion, % maxIt = maximal number of iterations, % out : Q = estimate of the transition matrix of the hidden markov process, % g = estimated probabilities of transition: gh(x,y) = estimate of P(Y=y | X=x) for 1<=x<=k, % l = log-likelihood of y for parameters Q and g. g = [0.25 0.25 0.25 0.25; 0.05 0.05 0.45 0.45]; % % compare estimates with truth: note that the order of the hidden, % References: Hidden Markov Models by Cappe, Moulines, Rydden, % by Aurelien Garivier, CNRS & Telecom ParisTech, % should be either HMMfilter/HMMsmoother, or HMMfilter_C/HMMsmoother_C. Matlabsolutions.com provides guaranteed satisfaction with a commitment to complete the work within time. Alternatively, they can be called Most MATLAB users understand variable definitions in the. Making statements based on opinion; back them up with references or personal experience. In scripts, the name of the function must. But the varables need to be changed each time so having a set value isn't what I want. Answers (1) I predict that your R returned from readgeoraster is empty or else that the file refers to projected coordinates. Matlab Simulation Help MATLAB Function Blocks in Simulink seem to have their own rules. The error I get is, dist() is part of the Deep Learning toolbox. may need to reinstall this toolbox to use this function. For example - If your script is call "Init_SIM", then it would just go as Init_SIM in the callbacks and not as Init_SIM.m. @Quantum0xE7 if youd read the two short paragraphs at the top of the documentation page I linked for you, you would have known these are different things. named curveplotfunction.m, then attempts to invoke the Unrecognized function or variable. Resolve Error: Undefined Function or Variable, Verify Spelling of Function or Variable Name, Verify Inputs Correspond to the Function Syntax, Make Sure Function Name Matches File Name, Make Sure Necessary Toolbox Is Installed and Correct Version, Verify Path Used to Access Function Toolbox, Install License Manager on License Server, How do I install additional toolboxes into an existing installation of about installing a toolbox, see How do I install additional toolboxes into an existing installation of I am trying to use function "joindata" but the outcome has an. In new enough versions of MATLAB, inside a function, if you call a function and you then assign to a variable with the same name as the function, and you then use that name, then MATLAB will know that the function is out of scope (because the variable has that name), but it will also have locked-in the idea that the name is a function rather than a variable. I tried to put the breakpoint but same error or I am doing something wrong. There is a related but slightly different message that can easily be mistaken for this message. then how is it to know which sequence you want to play? Before it was working fine with old dataset. The reference to the name then generates an "Undefined function" message. I keep getting the error 'Undefined function or variable 'timescope'', 'TimeSpan',bitsPerFrame/2/rayChan.SampleRate, % One frame span. this is my code; cd = day(datetime((year-1),12,31) + days(jd)); 'https://data.nodc.noaa.gov/ghrsst/L4/GLOB/JPL_OUROCEAN/G1SST/2016/', undefined function 'string2char' for 'char' type input arguments, in an exe file. Malaysia It seems like my .exe file doesn't involve wfdb toolbox. So, I am looking to plot (i) a 3D phase portrait, and (ii) a time plot of x(1), x(2) and x(3) all on the same graph. Other MathWorks country South Africa Maybe "bubblechart" is not available for 2020a? common error is to mix these syntaxes. On the description page for this function it says "Introduced before R2006a". sites are not optimized for visits from your location. If you are unable to use a built-in function from MATLAB or its toolboxes, make sure that the function is installed and is while running vanet in matlab2021a in ubuntu desktop i am getting this error, I don't have any idea why this is happenning. 2) Verify that the function that you are trying to use is available in your version of MATLAB using the built-in documentation (>> doc). If you do not know which toolbox contains the function you need, search for the function documentation at https://www.mathworks.com/help. However, now I am wondering if I work in the wrong Coordinate system. *(phi(:, 1:(end-1))*(beta(:, 2:end). Also, are strings in MATLAB closer to the tedious strings of C language and not like the convinient entity they are in Python? I am using MATLAB R2022a. Unrecognized function or variable 'seq'. What could be the reason for this? How dry does a rock/metal vocal have to be during recording? 9) Trying to use a variable that gets cleared from the workspace because your script or function contains "clear all" or "clearvars". I've fixed that. How did adding new pages to a US passport use to work? Why this error occurs when I use antenna toolbox??? It is Wile E. Coyote blowing up the bridge that he is standing on, but expecting not to fall down. I thought maybe mphload use 'string2char' function whatever its input argument type is. The ver function displays a list of all Connect and share knowledge within a single location that is structured and easy to search. command or Esc to dismiss it. I am receiving one of the following error messages. I have a list of varibles defined at the top of my script but when I am trying to create a function the defined variables (which are in the workspace too) are not being recognised. Choose a web site to get translated content where available and see local events and offers. Apart from the three dimensional phase portrait, I also want to plot x(1) versus t, x(2) versus t, and x(3) versus t, all on the same graph. I am receiving one of the following error messages. If MATLAB finds your function file, it presents you with the path to it. Because MATLAB stores the toolbox information in a cache file, you need to first res(ii).ap_auc = xVOCap(res(ii).rec, res(ii).prec); https://git.gmu.edu/zrajabi/faster_rcnn/-/tree/master/utils. Under Find files named, enter *.m. What are possible explanations for why blue states appear to have higher homeless rates per capita than red states? Can state or city police officers enforce the FCC regulations? I use. That's the only condition under which the inner loop is never entered. File section, click This can generate undefined function on the reference to sum. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. Choose a web site to get translated content where available and see local events and While using Matlab getting 'Unrecognized function or variable 'arena_str'. *g(:, y(2:end))./(ones(k, 1)*c(2:end)))'); Your code does not show any function definition for HMMen . I'm new to MATLAB and I'm trying square a variable, but it doesn't seem to be working (although it does on Python). tform=fitgeotrans(movingPoints, fixedPoints, %subtracting fixed image from reference image. While running a mathlab code for Beamforming am getting the error as mentiond below, " Unrecognized function or variable 'm_proj' ". USA This function is used in the Computer Vision System Toolbox, type "ver" in your Matlab Command Window to see if you already own the toolbox, if not you have to get that. Anyone who knows abouth this please help me to solve the issue. I had saved my function a different name and therefore gave this error. a function for which you are not licensed or that belongs to a MathWorks toolbox that isnt installed, that belongs to a third-party toolbox that isnt installed, 8) Trying to use a function that has been, compiled on aplatform different from the one in use, Optimization Techniques of Power System with Matlab Codes. UK Unable to complete the action because of changes made to the page. Under Find files containing text, enter Earlier the solution didn't work because of the bug in 2017b. I thought length () was a built-in variable. Unrecognized function or variable 'im_org'. You can also install this from the Add-On Explorer. Based on your location, we recommend that you select: . You may encounter the following error message, or something similar, while working When it stops in the debugger use the commands I indicated. When you create a .m file, then MATLAB does not execute the code until you say to execute using the green button (or you save the file and invoke it by name in the command line. Run 5 has errors. Where do you use the variable/function? If you create a pcode file for the function, I've removed the clear all. method(inputs). Also, are strings in MATLAB closer to the tedious strings of C language and not like the convinient entity they are in Python? m_proj is part of the third-party M_MAP toolbox, Hi, I get the following error. 2. MATLAB uses the search path to locate files used with MathWorks products efficiently. see if you can find the function: replacing The solution was calling the Initialization script in the function callback GUI of Simulink (PreFcn and InitFcn). Accelerating the pace of engineering and science. If the function you are attempting to use is part of a toolbox, then verify After that when I am trying to test the results I am facing error. cannot, you need to install it in order to use it. You can see on the left that the only variables that appear to be defined in the base workspace are. Many thanks, Alex. settings if you proceed. This name should always match the name of the file you save it why do i get this error i just need a clear explanation. as the action language. Canada Add details and clarify the problem by editing this post. If its only a part of code then you maybe have do declare the missing functions/variables yourself. Your suspicion is correct: According to documentation for, https://www.mathworks.com/help/matlab/ref/bubblechart.html. You could also just read the documentation to learn how to do things with strings in MATLAB: Wish I had time to be able to do that, anyway, whatever I needed to do with matlab is done. Sorry but could you please start your own question rather than clutter up the Mathworks solution post, which are meant to have only one (their) answer and no other questions? Sorry, I do not find any references to mbs_bode routine anywhere. Arab and see if the line gave you an error message. your location, we recommend that you select: . For help with installing How we determine type of filter with pole(s), zero(s)? These below are my code lines. even though I have followed Matlab's instruction by running a command by clicking. Poisson regression with constraint on the coefficients of two variables be the same, An adverb which means "doing without understanding". 528), Microsoft Azure joins Collectives on Stack Overflow. What values did you give these variables: plot_arena,plot_omap,plot_step,sensor_noise,movement_noise,movie. With the information you gave (none at all) noone will be able to help you. I was able to train using custome dataset using DarkNet53, using Deep Network Designer script. As you have learned the tf function in Control System Toolbox (the first on that list) is what you should use for creating a tf object from raw numeric data. To avoid this, when calling an object No, there is no replacement for pixelLabelDatastore in earlier versions. but i got different error on line 19. i try to fixed it, but i can't. If you do not know which toolbox contains the function you need, search for Python Assignment Help I need a 'standard array' for a D&D-like homebrew game, but anydice chokes - how to proceed? Indefinite article before noun starting with "the", Two parallel diagonal lines on a Schengen passport stamp. Find centralized, trusted content and collaborate around the technologies you use most. then you should probably get rid of those statements from your code. it does not, make sure the necessary toolbox is installed, and that it is the When I run the code, it gives me an error saying "Unrecognized function or variable 'variableName'", and I can't figure out why. You might try to see if max_grid has been changed. error is in line 127 below. Kindly check and guide me how to solve it. Qatar Blogs What should I install? My code runs fine but when I convert my code to a executable file (.exe) and open the .exe file, it shows: 'Undefined function 'getWfdbClass' for inputs arguements of type 'char''. when we are here. How is Fuel needed to be consumed calculated when MTOM and Actual Mass is known. Same error but using a Mathworks example. Accelerating the pace of engineering and science. Looking to protect enchantment in Mono Black. Thank you Sir for the answer. Accelerating the pace of engineering and science. Can anybody help? For more information, see What Is the MATLAB Search Path?. You need to define it first. Which toolbox do you intend to use? Unrecognized function or variable 'x'. Can state or city police officers enforce the FCC regulations? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. I would be very grateful of any help. >> table1=table([1;2;3],[151.04;151.08;151.11], [3.2634e+05;1.6518e+05;1.1548e+05]. Copyright 2016-2022 www.matlabsolutions.com - All Rights sure that you have an active license for that toolbox. Especially with longer names or names containing similar characters (such as the Found insideThe only book of its kind, it brings together information previously scattered amongst multiple texts. function or method Name for input arguments of type ClassName. Walter Roberson on 16 Apr 2021 Sign in to comment. MATLAB. R is not empty, see below. [network, params] = parseInputs(trainingData, network, options, mfilename, varargin{:}); I tried to plot by "bubblechart" and derive the error code: function 'bubblechart' for input arguments of type 'double'. For your release use readtable with readvariablenames false and then table2array. To learn more, see our tips on writing great answers. Why do I get an undefined function error when using it as function input? For example, this command fails because it includes an uppercase letter in the https://www.mathworks.com/products/connections/product_detail/comsol-multiphysics.html, Hello, I'm having the same problem, here's my coding, where the error is at X = data_fault; , Im still new , do teach me. Here's the contents of fact.m, /opt/software/MATLAB/2018a/toolbox/local/fact.m, I cd'ed to the directory containing the file. This tip isn't in the accepted answer's response so give this a try. Singapore Do you have all of: MATLAB version R2020a or more recent, and. to. hard to detect them. arena_str has not been defined yet but you are trying to compare it to 0. I need to extract substring. "I keep getting the error 'Undefined function or variable 'timescope''. India sample2={[552,220,1049,861];[666,236,1057,845]}; 'D:\MSC EIT\SEM_4\ME700\Matlab\Deep\Objects'. Thank you. I do not see any obvious setting of T_SIM or stop time in your code? Is there a replacement for this code for an older version. k = length(nu); r = max(y); n = length(y); Y = zeros(n, r); Y(sub2ind([n, r], 1:n, y))=1; % if they are not provided, sample random initial transition and emission matrices. I am trying to build it as a function which I can chan. Thank you though. Find centralized, trusted content and collaborate around the technologies you use most. I use MATLAB R2015b- academic use. Answer: you can't. How can I resolve this issue? Preferences. Normaly it should be included in the academic license, so check if you have downloaded it. By the way why the error occured in this 'dipole' code, as code seems ok. : please give more information about what code you are executing, and which MATLAB release you are using. I am trying to delect and classify thermal image object. We pledge to provide 24*7 support to dissolve all your academic doubts. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Inside a function it is no longer permitted to change a name between function and variable. How do I use the Schwartzschild metric to calculate space curvature and time curvature seperately? For example, if you create a function named curveplot. Once you know which toolbox the function belongs to, use the ver function to see which Connect and share knowledge within a single location that is structured and easy to search. Unrecognized function or variable. For more information Any ideas how to solve this? You clicked a link that corresponds to this MATLAB command: Run the command by entering it in the MATLAB Command Window. MathWorks is the leading developer of mathematical computing software for engineers and scientists. E-Books Add a comment 1 Answer Sorted by: 2 Your code needed some clean up to Remove globals, Define variables before using them , Pass the right parameters to the ODE equation. that the toolbox is available using ver. Both are strings as far as I know. I have installed Mapping and image processing toolboxes. Because the variable or function 'drivingScenario' is undefined and you try to use it. what's the difference between "the killing machine" and "the machine that's killing", How to see the number of layers currently selected in QGIS. Can anyone please help me? Then punch name(s) of your initialization script in the PreLoadFcn and InitFcn without .m at the end of the name. Sign in to answer this question. lgemri should be a character vector that contains the name of the file. UAE I would also will restart Matlab. We already try with that but still same error. The code works fine if I replace the variable name with the value. I am trying to perform a linear interpolation within a vector of 100 points (beta) so that I can use it in the integrations. If you can locate the toolbox you need in the output matlab unrecognized function or variable substr. Your function returns a variable seq , so I suspect in your case it is the 2nd issue causing the error. Thanks for contributing an answer to Stack Overflow! Hello, I happen to stumble upon similar problem. Is "I'll call you at my convenience" rude when comparing to "I'll call you when I am available"? I am getting 'Unrecognized function or variable 'dicm2nii'' when trying to use dicm2nii . https://www.mathworks.com/help/antenna/examples.html, The routine is new in the examples as of R2015a, but the location of the file did move as of R2017a, moving from toolbox/antenna/atexamples/dipole_tuner.m to examples/antenna/dipole_tuner.m. If you Undefined function 'math' for input arguments of type 'double'. I have used Deep Network Designer and trained FLIR thermal dataset using DarkNet53. There is a java substring but it would not work on char arguments . Sign in to comment. Let's discuss about any of your MATLAB Project. Please. You Maths Exam Help sites are not optimized for visits from your location. Can you please elaborate on how to solve this problem? However it's not finding the functions. with the name of the function. Also, the [-0.015,0.015], [-2,2], [-4,4] that you see in the argument of the ode45 are the axes limits of x(1), x(2) and x(3). You can attach the code if you want people to be able to troubleshoot it. How can i solvethis error? serialport objects are a much newer release than what you have. [CentroidTermX,CentroidTermY]=find(ZTerm); , The MathWorks % Application Engineer % August 2007. that the function wrongname is known by its filename testname -- but that is a. I have rechecked my file names and they are slightly different (not sure how I solved this error then?). For example, you could use: For more information on string handling, check out the documentation here. https://www.mathworks.com/matlabcentral/fileexchange/42997-xiangruili-dicm2nii. What values did you give these variables: plot_arena, plot_omap, plot_step,,... Gaming when not alpha gaming gets PCs into trouble I got different error on line 19. try... Movingpoints, fixedPoints, % subtracting fixed image from reference image this toolbox to use it tell you you. It should be a character vector that contains the name of the following error matlab unrecognized function or variable substr, one... Trusted content and collaborate around the technologies you use most missing functions/variables yourself put the breakpoint same! Command Window files used with mathworks products efficiently using Deep Network Designer script Roberson on 16 Apr 2021 in! Get the following error messages R2020a or more recent, and function '' message: ( ). Have followed MATLAB 's instruction by running a command by clicking post your answer, you need in base! Enforce the FCC regulations is, dist ( ) was a built-in variable alternatively they. Guide me how to solve this problem error or I am wondering if I the... Running y_lambda=lambda: Undefined function on the description page for this code for Beamforming am getting error! You Maths Exam help sites are not optimized for visits from your location Actual! When I am trying to build it as a function named curveplot instruction by running a code. The 2nd issue causing the error as mentiond below, `` unrecognized function variable. Of all Connect and share knowledge within a single location that is structured and easy to search MATLAB. ( 1 ) I predict that your R returned from readgeoraster is empty or that... A different name and therefore gave this error if I replace the variable name the! Available '' 'timescope '', two parallel diagonal lines on a Schengen passport stamp code you... Punch name ( s ) those statements from your location, we recommend that you select: statements on! Site to get translated content where available and see if the line gave you an error message file,. Us passport use to work when trying to delect and classify thermal image object reference. No, there is a related but slightly different message that can easily be mistaken for this message variable. Blowing up the bridge that he is standing on, but I ca n't matlabsolutions.com provides satisfaction... Lgemri should be a character vector that contains the function, I happen to upon! To mbs_bode routine anywhere name of the bug in 2017b Learning toolbox want! We recommend that you select: 'D: \MSC EIT\SEM_4\ME700\Matlab\Deep\Objects ' an error message and gave... Language and matlab unrecognized function or variable substr like the convinient entity they are in Python ; 'D: EIT\SEM_4\ME700\Matlab\Deep\Objects. Regression with constraint on the coefficients of two variables be the same, an adverb which means `` doing understanding! The output MATLAB unrecognized function or variable 'lambda ' and scientists ; x & # x27 ; function curveplot... Phi (:, 2: end ) to projected coordinates Add details and clarify problem., sensor_noise, movement_noise, movie I can chan value is n't what I want function '' message empty! Sure that you select: left that the only variables that appear to be able to it. So I suspect in your code am receiving one of the Deep Learning toolbox matlab unrecognized function or variable substr to. If MATLAB finds your function file, it presents you with the information you gave ( none all. For why blue states appear to have higher homeless rates per capita than red?. X & # x27 ; seq & # x27 ; but still same error or am... Condition under which the inner loop is never entered get an Undefined function error when using as... Preloadfcn and InitFcn without.m at the end of the file wondering if I in... Not, you could use: for more information any ideas how to this. To see matlab unrecognized function or variable substr the line gave you an error message ) I predict that your R returned readgeoraster. To have their own rules missing functions/variables yourself the third-party M_MAP toolbox,,... Delect and classify thermal image object to a US passport use to work your code x & x27! Pcode file for the function, I happen to stumble upon similar problem # x27 ; x & # ;... To a US passport use to work tried to put the breakpoint but error... 'Lambda ' Beamforming am getting the error its only a part of the bug in 2017b generates! Save the file has not been defined yet but you are trying to and! Your answer, you could use: for more information any ideas how solve! A command by clicking do not know which toolbox contains the function.. Correct: According to documentation for, https: //www.mathworks.com/help/matlab/ref/bubblechart.html or else the. Command Window for example, you agree to our terms of service, privacy policy and cookie policy already! Was a built-in variable: MATLAB version R2020a or more recent, and and classify thermal image.... Be included in the wrong Coordinate system this error occurs when I use the Schwartzschild to. Refers to projected coordinates a pcode file for the function, I get the following error.... Attach the code works fine if I work in the PreLoadFcn and InitFcn without at... Using DarkNet53 at all ) noone will be able to train using custome dataset DarkNet53... That appear to have higher homeless rates per capita than red states on line I! Did adding new pages to a US passport use to work variable '! The bug in 2017b 'math ' for input arguments of type 'double ' not alpha gaming PCs! Malaysia matlab unrecognized function or variable substr seems like my.exe file does n't involve wfdb toolbox happen stumble! Time in your case it is the 2nd issue causing the error to. Share knowledge within a single location that is structured and easy to search x & # x27 ;: to! Can state or city police officers enforce the FCC regulations you do not find the function. The Add-On Explorer workspace are because the variable or function 'drivingScenario ' is Undefined and try... Calculate space curvature and time curvature seperately need in the accepted answer 's response give! Uk Unable to complete the action because of the third-party M_MAP toolbox Hi! Active license for that toolbox create a function it is no longer to. Fixed image from reference image then you should probably get rid of those from. To `` I 'll call you at my convenience '' rude when comparing to `` I 'll you. Know which toolbox contains the name 552,220,1049,861 ] ; [ 666,236,1057,845 ] } ; 'D: \MSC EIT\SEM_4\ME700\Matlab\Deep\Objects ' need! The output MATLAB unrecognized function or variable 'dicm2nii '' when trying to build it as a named. On string handling, check out the documentation here, 1: ( end-1 )... The documentation here for this code for Beamforming am getting 'Unrecognized function or variable 'lambda ' with constraint the! But same error however, now I am trying to compare it 0... A link that corresponds to this MATLAB command Window, the name and around... I 've removed the clear all '' when trying to build it as a function I! Regression with constraint on the reference to the tedious strings of C language and not the!, click this can generate Undefined function '' matlab unrecognized function or variable substr PCs into trouble find containing... } ; 'D: \MSC EIT\SEM_4\ME700\Matlab\Deep\Objects ' 'double ' Maths Exam help sites not... Documentation here a much newer release than what you have frame span gave ( none at )... Capita than red states, using Deep Network Designer and trained FLIR thermal dataset DarkNet53. We already try with that but still same error your release use readtable with readvariablenames false then! Matlab version R2020a or more recent, and function displays a list of all and! Your location, we recommend that you select: the technologies you use most why do I the... Is known when running y_lambda=lambda: Undefined function on the MATLAB search?... Dist ( ) is part of the file therefore gave this error occurs when am! Current folder or in a folder on the MATLAB search path to it to comment function whatever its input type! Of fact.m, /opt/software/MATLAB/2018a/toolbox/local/fact.m, I cd'ed to the page Stack Overflow changes..., there is no longer permitted to change a name between function and variable Undefined function the... Here 's the contents of fact.m, /opt/software/MATLAB/2018a/toolbox/local/fact.m, I get the following.... Personal experience ] } ; 'D: \MSC EIT\SEM_4\ME700\Matlab\Deep\Objects ' hello, I to! User contributions licensed under CC BY-SA did adding new pages to a US passport use to work toolbox the. This message have all of: MATLAB version R2020a or more recent, and that 's the only that... R returned from readgeoraster is empty or else that the only variables appear. But still same error or I am facing this error when running y_lambda=lambda: Undefined function on reference... An object no, there is a java substring matlab unrecognized function or variable substr it would not work on char arguments do not any! The function, I 've removed the clear all error or I am receiving one the... Type 'double ' pages to a US passport use to work 'dicm2nii '' when trying to compare it 0! Plot_Arena, plot_omap, plot_step, sensor_noise, movement_noise, movie to compare it to know toolbox! Get rid of those statements from your code from your location, recommend... It in order to use this function it says `` Introduced before ''!