mxSetUint8s (C)

Set real data elements in mxUINT8_CLASS array

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C Syntax

#include "matrix.h"
int mxSetUint8s(mxArray *pa, mxUint8 *dt);

Description

Use mxSetUint8s to set mxUint8 data in the specified array.

All mxCreate* functions allocate heap space to hold data. Therefore, you do not ordinarily use this function to initialize the elements of an array. Rather, call the function to replace existing values with new values.

This function does not free memory allocated for existing data. To free existing memory, call mxFree on the pointer returned by mxGetUint8s.

Input Arguments

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Pointer to an mxUINT8_CLASS array.

Pointer to the first mxUint8 element of the data array. dt must be allocated by the functions mxCalloc or mxMalloc.

Output Arguments

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Function status, returned as int. If successful, then the function returns 1.

If pa is NULL, then the function returns 0.

The function is unsuccessful when mxArray is not an unshared mxUINT8_CLASS array, or if the data is not allocated with mxCalloc. If the function is unsuccessful, then:

  • MEX file — Function terminates the MEX file and returns control to the MATLAB® prompt.

  • Standalone (non-MEX file) application — Function returns 0.

Examples

Refer to the arrayFillSetPr.c example in the matlabroot/extern/examples/refbook folder which copies existing data into an mxArray. The data in the example is defined as mxDouble. To modify this example for uint8 data:

  • Declare the data variables as mxUint8

  • Call mxCreateNumericMatrix with the numeric type mxUINT8_CLASS

  • Replace mxSetDoubles with mxSetUint8s to put the C array into an mxArray

API Version

This function is available in the interleaved complex API. To build myMexFile.c using this function, type:

mex -R2018a myMexFile.c

See Also

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Introduced in R2018a

MATLAB Documentation

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