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I want to utilize the optimization toolbox of MATLAB, namely the genetic algorithm.
But my function is an executible, which I wrote in C, which takes a text file as input. In this input file the variables can be set. So I want MATLAB to modify this text file, run the executible, and take the result in an iteration. Is that possible?
You can call C, C++, or FORTRAN code in MATLAB by compiling your code into a MATLAB Executable called a MEX-file : http://www.mathworks.com/support/tech-notes/1600/1622.html
Then you would have to call this MEX-file in your fitness function.