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MEX File Generates Incorrect Results

If your program generates the wrong answers, consider the following.

  • Check for errors in the computational logic.

  • Check if the program reads from an uninitialized section of memory. For example, reading the 11th element of a 10-element vector yields unpredictable results.

  • Check if the program overwrites valid data due to memory mishandling. For example, writing to the 15th element of a 10-element vector overwrites data in the adjacent variable in memory. This case can be handled in a similar manner as segmentation violations.

In all these cases, you can use mexPrintf to examine data values at intermediate stages. Alternatively, run MATLAB® within a debugger.

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