Funny Behavior When Doing Substitution w/ matlabFunction Files

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:

1. If I try to run the second function I get the error 'Not enough input arguments.'
2. 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?

Answer 1

[Walter Roberson]

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."

[William Wooley]

Two great tips. Thanks! I can't believe I overlooked that part of the documentation.

[Walter Roberson]

I think it might be relatively new. I only noticed that in the documentation a few months ago.