Using the C++ Math Library

Array Access Functions

The Array Access and Creation Library contains the array creation and access routines for the mxArray data type. In general, the arguments to these functions are mxArray* pointers instead of mwArray variables. For example, mxCreateDoubleMatrix() creates an mxArray; mxDestroyArray() destroys one.

Refer to the online MATLAB Application Program Interface Reference for a detailed definition of each function. The MATLAB Application Program Interface Guide also documents these functions.

Note    You can recognize an Array Access and Creation Library routine by its prefix mx.

Array Access Routines 

Function	Purpose
mxCalloc, mxFree	Allocate and free dynamic memory using MATLAB's memory manager.
mxClearLogical	Clear the logical flag.
mxCreateCellArray	Create an unpopulated N-dimensional cell mxArray.
mxCreateCellMatrix	Create an unpopulated 2-D cell mxArray.
mxCreateCharArray	Create an unpopulated N-dimensional string mxArray.
mxCreateCharMatrixFromStrings	Create a populated 2-D string mxArray.
mxCreateDoubleMatrix	Create an unpopulated 2-D, double-precision, floating-point mxArray.
mxCreateNumericArray	Create an unpopulated N-dimensional numeric mxArray.
mxCreateSparse	Create a 2-D unpopulated sparse mxArray.
mxCreateString	Create a 1-by-n string mxArray initialized to the specified string.
mxCreateStructArray	Create an unpopulated N-dimensional structure mxArray.
mxCreateStructMatrix	Create an unpopulated 2-D structure mxArray.
mxDestroyArray	Free dynamic memory allocated by an mxCreate routine.
mxDuplicateArray	Make a deep copy of an array.
mxGetCell	Get a cell's contents.
mxGetClassID	Get (as an enumerated constant) an mxArray's class.
mxGetClassName	Get (as a string) an mxArray's class.
mxGetData	Get pointer to data.
mxGetDimensions	Get a pointer to the dimensions array.
mxGetElementSize	Get the number of bytes required to store each data element.
mxGetEps	Get value of eps.
mxGetField	Get a field value, given a field name and an index in a structure array.
mxGetFieldByNumber	Get a field value, given a field number and an index in a structure array.
mxGetFieldNameByNumber	Get a field name, given a field number in a structure array.
mxGetFieldNumber	Get a field number, given a field name in a structure array.
mxGetImagData	Get pointer to imaginary data of an mxArray.
mxGetInf	Get the value of infinity.
mxGetIr	Get the ir array of a sparse matrix.
mxGetJc	Get the jc array of a sparse matrix.
mxGetM, mxGetN	Get the number of rows (M) and columns (N) of an array.
mxGetName, mxSetName	Get and set the name of an mxArray.
mxGetNaN	Get the value of Not-a-Number.
mxGetNumberOfDimensions	Get the number of dimensions.
mxGetNumberOfElements	Get number of elements in an array.
mxGetNumberOfFields	Get the number of fields in a structure mxArray.
mxGetNzmax	Get the number of elements in the ir, pr, and (if it exists) pi arrays.
mxGetPi, mxGetPr	Get the real and imaginary parts of an mxArray.
mxGetScalar	Get the real component from the first data element of an mxArray.
mxGetString	Copy the data from a string mxArray into a C-style string.
mxIsChar	True for a character array.
mxIsClass	True if mxArray is a member of the specified class.
mxIsComplex	True if data is complex.
mxIsDouble	True if mxArray represents its data as double-precision, floating-point numbers.
mxIsEmpty	True if mxArray is empty.
mxIsFinite	True if value is finite.
mxIsInf	True if value is infinite.
mxIsLogical	True if mxArray is Boolean.
mxIsNaN	True if value is Not-a-Number.
mxIsNumeric	True if mxArray is numeric or a string.
mxIsSingle	True if mxArray represents its data as single-precision, floating-point numbers.
mxIsSparse	Inquire if an mxArray is sparse. Always false for the MATLAB C Math Library.
mxIsStruct	True if a structure mxArray.
mxMalloc	Allocate dynamic memory using MATLAB's memory manager.
mxRealloc	Reallocate memory.
mxSetCell	Set the value of one cell.
mxSetData	Set pointer to data.
mxSetDimensions	Modify the number of dimensions and/or the size of each dimension.
mxSetField	Set a field value of a structure array, given a field name and an index.
mxSetFieldByNumber	Set a field value in a structure array, given a field number and an index.
mxSetImagData	Set imaginary data pointer for an mxArray.
mxSetIr	Set the ir array of a sparse mxArray.
mxSetJc	Set the jc array of a sparse mxArray.
mxSetLogical	Set the logical flag.
mxSetM, mxSetN	Set the number of rows (M) and columns (N) of an array.
mxSetNzmax	Set the storage space for nonzero elements.
mxSetPi, mxSetPr	Set the real and imaginary parts of an mxArray.

Utility Functions

Directory Organization