Why do I get an "undeclared identifier" error when using MEX with the option -D in MATLAB 7.7(R2008b)?

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MathWorks Support Team 2009-6-27

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While using the following code :

var1 = var1_GUI; % value set from the GUI script
outputName = sprintf('file%d', var1);
mex -DVAR1=var1 -output outputName file.c

I get the following error messages:

Error ...file.c: <lineNumber> undeclared identifier `var1'

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MathWorks Support Team 2009-6-27

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https://ww2.mathworks.cn/matlabcentral/answers/100688-why-do-i-get-an-undeclared-identifier-error-when-using-mex-with-the-option-d-in-matlab-7-7-r2008b#answer_110037

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The MEX function does not evaluate MATLAB variables from the workspace. In order to evaluate workspace variables, replace the following code:

mex -DVAR1=var1 file.c

with:

eval(['mex -DVAR1=' var1 ' file.c])'

This will make sure that the value of var1 is printed into a string and therefore evaluated.

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