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Pass Scalar Values

Here is a Fortran computational routine that takes a scalar and doubles it.

      subroutine timestwo(y, x)
      real*8 x, y
C     
      y = 2.0 * x
      return
      end

To see the same function written in the MEX file format (timestwo.F), open the file in MATLAB® Editor.

To build this example, at the command prompt type:

mex timestwo.F

This command creates the binary MEX file called timestwo with an extension corresponding to the machine type on which you are running. You can now call timestwo like a MATLAB function:

x = 2;
y = timestwo(x)
y =
     4
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