mxCreateUninitNumericMatrix (C)

Uninitialized 2-D numeric matrix

C Syntax

#include "matrix.h"
mxArray *mxCreateUninitNumericMatrix(size_t m, size_t n, 
  mxClassID classid, mxComplexity ComplexFlag);

Arguments

m

Number of rows

n

Number of columns

classid

Identifier for the class of the array, which determines the way the numerical data is represented in memory. For example, specifying mxINT16_CLASS causes each piece of numerical data in the mxArray to be represented as a 16-bit signed integer.

ComplexFlag

If the mxArray you are creating is to contain imaginary data, set ComplexFlag to mxCOMPLEX. Otherwise, set ComplexFlag to mxREAL.

Returns

Pointer to the created mxArray, if successful. If unsuccessful in a standalone (non-MEX file) application, returns NULL. If unsuccessful in a MEX file, the MEX file terminates and returns control to the MATLAB^® prompt. The function is unsuccessful when there is not enough free heap space to create the mxArray.

Example

To open an example, type:

edit([fullfile(matlabroot,"extern","examples","mx","filename")]);

where filename is:

• mxcreateuninitnumericmatrix.c

Description

Call mxCreateUninitNumericMatrix to create a 2-D mxArray in which all data elements have the numeric data type specified by classid. Data elements are not initialized.

mxCreateUninitNumericMatrix allocates dynamic memory to store the created mxArray. Call mxDestroyArray to deallocate the memory.

The following table shows the C classid values that are equivalent to MATLAB classes.

MATLAB Class Name	C classid Value
int8	mxINT8_CLASS
uint8	mxUINT8_CLASS
int16	mxINT16_CLASS
uint16	mxUINT16_CLASS
int32	mxINT32_CLASS
uint32	mxUINT32_CLASS
int64	mxINT64_CLASS
uint64	mxUINT64_CLASS
single	mxSINGLE_CLASS
double	mxDOUBLE_CLASS