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Handle 8-, 16-, and 32-Bit Data

The MATLAB® API provides a set of functions that support signed and unsigned 8-, 16-, and 32-bit data. For example, the mxCreateNumericArray function constructs an unpopulated N-dimensional numeric array with a specified data size. For more information, see mxClassID.

Once you have created an unpopulated MATLAB array of a specified data type, you can access the data using mxGetData and mxGetImagData. These two functions return pointers to the real and imaginary data. You can perform arithmetic on data of 8-, 16-, or 32-bit precision in MEX-files and return the result to MATLAB, which recognizes the correct data class.

The example, doubleelement.c, constructs a 2-by-2 matrix with unsigned 16-bit integers, doubles each element, and returns both matrices to MATLAB. To see the example, open the fileopen the file in MATLAB Editor.

To build this example, at the command prompt type:

mex doubleelement.c

Call the example.

ans =
     2     6
     4     8

The output of this function is a 2-by-2 matrix populated with unsigned 16-bit integers.

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