MATLAB: How to print text to the MATLAB command window from a FORTRAN MEX file

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How do I print text to the MATLAB command window from a FORTRAN MEX file?

Best Answer

Use mexPrintf to print to the MATLAB command window when using MEX files. Two examples are shown below.
Example 1: Print "API says hello!" to the MATLAB command window
#include "fintrf.h" 
      subroutine mexFunction(nlhs, plhs, nrhs, prhs) 
C     Specify alert to be printed 
      character (len=*), PARAMETER :: txt = "API says hello!"
C     Call the API     
      call mexPrintf(txt)
      end
Example 2: Print the number of input arguments to the MATLAB command window:
#include "fintrf.h" 
      subroutine mexFunction(nlhs, plhs, nrhs, prhs) 
        character (len=1) :: c
        character (len=50) :: txt
C     Specify alert to be printed
      write(txt,'(A)') 'Number of inputs (mexPrintf): ' 
C     Convert nrhs to char
      write(c,'(i1)') nrhs
C     Call the API
      call mexPrintf(txt)
      call mexPrintf(c)
      end
There are many FORTRAN MEX function source code examples available at:
https://www.mathworks.com/help/matlab/matlab_external/table-of-mex-file-source-code-files.html
Look in the table for examples with the .F file extension.
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