Compiled standalone matlab executable fails at math; what am I doing wrong?

Given file test.m:

function test( a, b )
%UNTITLED Summary of this function goes here
%   Detailed explanation goes here
a
b
x = a + b;
x
fileID = fopen('test.out', 'w');
fprintf(fileID, 'x=%d', x);
fprintf('%s', 'test.out');

end

compiled with: mcc -m -R nodisplay test.m -d out/

I would expect: out/test.app/Contents/MacOS/test 1 1

To give me 2, both in test.out and on the console. It however returns:

a =

1

b =

1

x =

      98

test.out

And test.out contains: x=98

I am flabbergasted... Within matlab everything works as expected. What changes during compile? And how do I fix this

Answer 1

[Andrew Schenk]

When you use the MATLAB Compiler, the input argument type will strings.

Loren talks a little more about this here http://blogs.mathworks.com/loren/2010/12/21/strings-and-numbers-as-arguments/

When the function displays a and b, it displays the string. However when the addition is preformed, MATLAB dynamically converts the strings into numbers, but using their ASCII value. The character 1 has an ASCII value of 49. Thus 49+49 = 98.

What you should do instead is add the following to the top of your function:

a = str2num(a);
b = str2num(b);

Answer 2

[Tino de Bruijn]

Ah, I did read that somewhere. And I also figured 98 was probably a 'b', but it was too late to make the connection though...

Thanks!