Funny Behavior When Doing Substitution w/ matlabFunction Files

Question

William Wooley 2015-12-17

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https://ww2.mathworks.cn/matlabcentral/answers/260766-funny-behavior-when-doing-substitution-w-matlabfunction-files

评论： Walter Roberson 2015-12-17

I have a symbolic function that I convert to a numeric file using matlabFunction. Then, using the find_and_replace function from the file exchange I substituted out several arguments and replace them with elements of a matrix.

So whereas before my function was something like

function H = H(arg1a,arg2a,arg1b,arg2b)
    H = arg1a + arg2a + arg1b + arg2b;
end

It is now

function H = H(arg_a,arg_b)
    H = arg_a(1) + arg_a(2) + arg_b(1) + arg_b(2);
end

Two odd things happen:

If I try to run the second function I get the error 'Not enough input arguments.'
If I a) open the script b.) delete a semicolon c.) save d.) add the semicolon e.) save, then everything runs well.

Any ideas of what might be going on here?

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Answer 1

Walter Roberson 2015-12-17

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在 MATLAB Online 中打开

MATLAB did not detect that you had modified the file and used the one that was already in its cache. It would also have worked if you had used

clear H

When-ever you use code to modify a .m file that you have executed, you should "clear" the function.

Note that there is a better way of doing what you did. See http://www.mathworks.com/help/symbolic/matlabfunction.html#zmw57dd0e82644 and the example "Now, convert an expression r to a MATLAB function whose second input argument is a vector."