Cant figure out why I am getting error message for this integration

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Joe Bennet 2021-3-21

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https://ww2.mathworks.cn/matlabcentral/answers/779202-cant-figure-out-why-i-am-getting-error-message-for-this-integration

评论： Joe Bennet 2021-3-21

shown below is a peice of code exerpted from a much larger code. For some reason, when it is run on its own (ie, not in the main code) it works fine, but when I try to run the exact same thing in my main code, it doesnt work, giving me the following error message => Error using sym/subsindex (line 864)

Invalid indexing or function definition. Indexing must follow MATLAB indexing. Function arguments must be symbolic variables,

and function body must be sym expression." Can anyone help?

thanks very much!

sas= meanie;
sasmax=max(sas);
sasmin=min(sas);
A1= sasmax-sasmin;
y1= mean(sas);
w1= A1*sin(2*pi*t*freq1)+y1;
syms 't'
a01= int((A1*sin((2*pi*freq1*t))+y1),t,-pi,pi);