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Error "Undefined function or variable"
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I defined a function;
function [maBar, wBar, alphaBar] = hcEqPt(vBar, c1, c2, c3, c4)
wBar = vBar/0.129;
maBar = (36.6 + 0.106*wBar + c4*(wBar^2))/c3;
alphaBar = (acos(1-(c2*wBar*maBar/c1)) + 0.0252)/ 1.14;
end
[maBar_1, wBar_1, alphaBar_1] = hcEqPt(22, 0.6, 0.095, 47500, 0.0026);
disp("At v=22, ma = %d, w = %d, alpha = %d", maBar_1, wBar_1, alphaBar_1);
When I try to use this function to obtain a values of vBar further in the script it shows an error "Undefined function or variable".
Kindly help.
Answers (1)
madhan ravi
on 9 Sep 2019
[maBar_1, wBar_1, alphaBar_1] = hcEqPt(22, 0.6, 0.095, 47500, 0.0026);
fprintf('At v=22, ma = %d, w = %d, alpha = %d', maBar_1, wBar_1, alphaBar_1);
function [maBar, wBar, alphaBar] = hcEqPt(vBar, c1, c2, c3, c4)
wBar = vBar/0.129;
maBar = (36.6 + 0.106*wBar + c4*(wBar^2))/c3;
alphaBar = (acos(1-(c2*wBar*maBar/c1)) + 0.0252)/ 1.14;
end
22 Comments
madhan ravi
on 9 Sep 2019
function definition should be at the end of the file when you use it in a script file: https://in.mathworks.com/help/matlab/ref/function.html#description
Shikhar Sharma
on 9 Sep 2019
Hey I tried what you mentioned above,
[maBar_1, wBar_1, alphaBar_1] = hcEqPt(22, 0.6, 0.095, 47500, 0.0026);
fprintf("At v=22, ma = %d, w = %d, alpha = %d", maBar_1, wBar_1, alphaBar_1);
function [maBar, wBar, alphaBar] = hcEqPt(vBar, c1, c2, c3, c4)
wBar = vBar/0.129;
maBar = (36.6 + 0.106*wBar + c4*(wBar^2))/c3;
alphaBar = (acos(1-(c2*wBar*maBar/c1)) + 0.0252)/ 1.14;
end
But it still shows undefined function or variable 'hcEqPt'.
madhan ravi
on 9 Sep 2019
Edited: madhan ravi
on 9 Sep 2019
Hey what version are you using?? It works for me without a flaw. If you’re using version prior to 2016b save the function in a separate file , the name of the file should be in the name of the function.
Shikhar Sharma
on 9 Sep 2019
Iam using 2019a.
madhan ravi
on 9 Sep 2019
Could you share a screenshot of the script file?
madhan ravi
on 9 Sep 2019
Man you have some serioud problems in just copying properly. Did you even read the answer properly?? THE FUNCTION DEFINITION SHOULD BE AT THE END OF THE FILE!!!
Shikhar Sharma
on 9 Sep 2019
Relax man, I'm quite new to this and trying to learn.
Also, I did remove the function from the beginning of the file and ran the code. But it still shows the error I mentioned above.
madhan ravi
on 9 Sep 2019
Edited: madhan ravi
on 9 Sep 2019
Paste the screenshot of the one with the changes you made. Those wiggly orange and red lines are not for decorations hover the mouse over it (it'll display the warning).
madhan ravi
on 9 Sep 2019
Copy the below and paste it in a new file named Shikhar.m and run the code , let's see if that triggers any errors.
[maBar_1, wBar_1, alphaBar_1] = hcEqPt(22, 0.6, 0.095, 47500, 0.0026);
fprintf('At v=22, ma = %d, w = %d, alpha = %d', maBar_1, wBar_1, alphaBar_1);
function [maBar, wBar, alphaBar] = hcEqPt(vBar, c1, c2, c3, c4)
wBar = vBar/0.129;
maBar = (36.6 + 0.106*wBar + c4*(wBar^2))/c3;
alphaBar = (acos(1-(c2*wBar*maBar/c1)) + 0.0252)/ 1.14;
end
Shikhar Sharma
on 9 Sep 2019
This works perfectly fine.
I think the problem is clear roots.
madhan ravi
on 9 Sep 2019
You can remove that line , sir Walter and I suggested in your previous question is because you had defined roots as a variable somewhere so once you clear it from workspace it would'nt be a problem. You can just hover the mouse to that red line and see what message MATLAB displays there (this is only if you're curious to prevent it in the future.) Once you figure it out please do share the solution.
Shikhar Sharma
on 9 Sep 2019
To be honest, I had not defined roots anywhere before in the file. When I remove it, the error moves to the next line and happens subsequently.
madhan ravi
on 9 Sep 2019
Edited: madhan ravi
on 9 Sep 2019
https://in.mathworks.com/matlabcentral/answers/479467-error-undefined-function-or-variable#comment_743649 - this is the basic reason causing the problem then, I know you would'nt accept it but the fact remains as is.
As you yourself has mentioned https://in.mathworks.com/matlabcentral/answers/479467-error-undefined-function-or-variable#comment_743665
If you're still not able to cope up with all the mentioned above suggestions , I request you to upload your script file here, so that I can rectify the mistakes if any.
Walter Roberson
on 9 Sep 2019
You cannot define the same function twice in one script (except in some cases having to do with nested functions)
Shikhar Sharma
on 9 Sep 2019
Please find attached.
madhan ravi
on 9 Sep 2019
Really? Comeon, that's a pdf file not a script file attach your file with .m extension.
Walter Roberson
on 9 Sep 2019
All function definitions must be at the end of a script. No exceptions.
Possibly they intend that you use separate .m files for each section.
madhan ravi
on 9 Sep 2019
Edited: madhan ravi
on 9 Sep 2019
Looks like you didn't give any attention to the suggestion , well done :). See the attached file.
Please again don't miss the valuable comment given by sir Walter
Shikhar Sharma
on 9 Sep 2019
Thank you very much for your time. I am quite new to this and trying to cope up with it.
Thank you for being patient. :)
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