由于看的代码里面以及一些工程需要涉及一些Matlab 混合编程，一直想看一下，首先一个就是使用C编写代码，编译之后由Matlab调用，这需要用到Mex函数，mex程序就是根据一定的接口规范（mtlab提出的）编写的一个dll，Mex文件既可以用c，也可以用fortran来编。本文介绍的是用C编写的。
这样做，若是代码中有循环的话，使用matlab的话需要循环解释多次，而使用C语言编译成dll之后，首先可以将循环体放入二进制程序中，利用matlab加快运算，而不是循环解释执行matlab代码。还有就是使用C可以加快代码的开发效率。
#include "mex.h"
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
mexPrintf("hello,world!\n");
}//hello.c 2.0
#include "mex.h"
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
int i;
i=mxGetScalar(prhs[0]);
if(i==1)
mexPrintf("hello,world!\n");
else
mexPrintf("大家好！\n");
}//hello.c 2.1
#include "mex.h"
void mexFunction(int nlhs, mxArray *plhs[],
int nrhs, const mxArray *prhs[])
{
int *i;
i=mxGetPr(prhs[0]); //prhs是一个指针数组（每一个是一个指针），所以返回一个指针
if(i[0]==1)
mexPrintf("hello,world!\n");
else
mexPrintf("大家好！\n");
} //show.c 1.0
#include "mex.h"
#include "mex.h"
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
double *data;
int M,N;
int i,j;
data=mxGetPr(prhs[0]); //获得指向矩阵的指针
M=mxGetM(prhs[0]); //获得矩阵的行数
N=mxGetN(prhs[0]); //获得矩阵的列数
for(i=0;i<M;i++)
{ for(j=0;j<N;j++)
mexPrintf("%4.3f ",data[j*M+i]);
mexPrintf("\n");
}
} a=1:10; b=[a;a+1]; show(a) show(b)
//reverse.c 1.0
#include "mex.h"
void mexFunction(int nlhs, mxArray *plhs[],
int nrhs, const mxArray *prhs[])
{
double *inData;
double *outData;
int M,N;
int i,j;
inData=mxGetPr(prhs[0]);
M=mxGetM(prhs[0]);
N=mxGetN(prhs[0]);
plhs[0]=mxCreateDoubleMatrix(M,N,mxREAL);
outData=mxGetPr(plhs[0]);
for(i=0;i<M;i++)
for(j=0;j<N;j++)
outData[j*M+i]=inData[(N-1-j)*M+i];
} #include "mex.h"
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
double *inData;
double *outData;
int M,N;
//异常处理
//异常处理
if(nrhs!=1)
mexErrMsgTxt("USAGE: b=reverse(a)\n");
if(!mxIsDouble(prhs[0]))
mexErrMsgTxt("the Input Matrix must be double!\n");
inData=mxGetPr(prhs[0]);
M=mxGetM(prhs[0]);
N=mxGetN(prhs[0]);
plhs[0]=mxCreateDoubleMatrix(M,N,mxREAL);
outData=mxGetPr(plhs[0]);
for(i=0;i<M;i++)
for(j=0;j<N;j++)
outData[j*M+i]=inData[(N-1-j)*M+i];
}
MX Matrix Library
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Type for index values |
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Pointer type for platform |
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Signed integer type for size values |
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Type for size values |
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Field to structure array |
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Type for MATLAB array |
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Convert array to string |
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Check assertion value for debugging purposes |
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Check assertion value without printing assertion text |
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Offset from first element to desired element |
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Allocate dynamic memory for array using MATLAB memory manager |
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Type for string array |
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Enumerated value identifying class of array |
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Identifier corresponding to class |
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Flag specifying whether array has imaginary components |
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CHARACTER values from Fortran array to pointer array |
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COMPLEX*16 values from Fortran array to pointer array |
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COMPLEX*8 values from Fortran array to pointer array |
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INTEGER*1 values from Fortran array to pointer array |
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INTEGER*2 values from Fortran array to pointer array |
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INTEGER*4 values from Fortran array to pointer array |
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CHARACTER values from pointer array to Fortran array |
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COMPLEX*16 values from pointer array to Fortran array |
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COMPLEX*8 values from pointer array to Fortran array |
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INTEGER*1 values from pointer array to Fortran array |
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INTEGER*2 values from pointer array to Fortran array |
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INTEGER*4 values from pointer array to Fortran array |
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Pointer values from pointer array to Fortran array |
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REAL*4 values from pointer array to Fortran array |
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REAL*8 values from pointer array to Fortran array |
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REAL*4 values from Fortran array to pointer array |
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REAL*8 values from Fortran array to pointer array |
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Unpopulated N-D cell array |
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Unpopulated 2-D cell array |
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Unpopulated N-D string array |
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Create populated 2-D string array |
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2-D, double-precision, floating-point array initialized to 0 |
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Scalar, double-precision array initialized to specified value |
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N-D logical array initialized to false |
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2-D, logical array initialized to false |
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Scalar, logical array |
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Unpopulated N-D numeric array |
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Numeric matrix initialized to 0 |
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2-D unpopulated sparse array |
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Unpopulated 2-D, sparse, logical array |
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Create 1-by-N array initialized to specified string |
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Unpopulated N-D structure array |
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Unpopulated 2-D structure array |
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Free dynamic memory allocated by MXCREATE* functions |
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Make deep copy of array |
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Free dynamic memory allocated by MXCALLOC, MXMALLOC, or MXREALLOC functions |
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Contents of array cell |
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Pointer to character array data |
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Class of array |
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Class of array as string |
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Pointer to real data |
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Pointer to dimensions array |
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Number of bytes required to store each data element |
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Value of EPS |
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Field value, given field name and index, into structure array |
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Field value, given field number and index, into structure array |
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Field name, given field number, in structure array |
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Field number, given field name, in structure array |
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Pointer to imaginary data of array |
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Value of infinity |
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Sparse matrix IR array |
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Sparse matrix JC array |
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Pointer to logical array data |
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Number of rows in array |
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Number of columns in array |
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Value of NaN (Not-a-Number) |
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Number of dimensions in array |
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Number of elements in array |
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Number of fields in structure array |
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Number of elements in IR, PR, and PI arrays |
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Imaginary data elements in array of type DOUBLE |
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Real data elements in array of type DOUBLE |
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Value of public property of MATLAB object |
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Real component of first data element in array |
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String array to C-style string |
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Determine whether input is cell array |
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Determine whether input is string array |
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Determine whether array is member of specified class |
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Determine whether data is complex |
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Determine whether mxArray represents data as double-precision, floating-point numbers |
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Determine whether array is empty |
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Determine whether input is finite |
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Determine whether array was copied from MATLAB global workspace |
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Determine whether input is infinite |
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Determine whether array represents data as signed 16-bit integers |
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Determine whether array represents data as signed 32-bit integers |
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Determine whether array represents data as signed 64-bit integers |
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Determine whether array represents data as signed 8-bit integers |
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Determine whether array is of type mxLogical |
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Determine whether scalar array is of type mxLogical |
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Determine whether scalar array of type mxLogical is true |
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Determine whether input is NaN (Not-a-Number) |
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Determine whether array is numeric |
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Determine whether array represents data as single-precision, floating-point numbers |
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Determine whether input is sparse array |
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Determine whether input is structure array |
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Determine whether array represents data as unsigned 16-bit integers |
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Determine whether array represents data as unsigned 32-bit integers |
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Determine whether array represents data as unsigned 64-bit integers |
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Determine whether array represents data as unsigned 8-bit integers |
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Type for logical array |
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Allocate dynamic memory using MATLAB memory manager |
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Reallocate dynamic memory using MATLAB memory manager |
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Remove field from structure array |
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Value of one cell of array |
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Convert structure array to MATLAB object array |
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Set pointer to data |
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Modify number of dimensions and size of each dimension |
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Set structure array field, given structure field name and array index |
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Set structure array field, given field number and index |
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Imaginary data pointer for array |
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IR array of sparse array |
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JC array of sparse array |
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Number of rows in array |
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Set number of columns in array |
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Set storage space for nonzero elements |
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Set new imaginary data for array |
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Set new real data for array |
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Set value of public property of MATLAB object |
MEX Library
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Register function to call when MEX-function cleared or MATLAB software terminates |
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Call MATLAB function, user-defined function, or MEX-file |
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Call MATLAB function, user-defined function, or MEX-file and capture error information |
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Display error message with identifier and return to MATLAB prompt |
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Display error message and return to MATLAB prompt |
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Execute MATLAB command in caller workspace |
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Execute MATLAB command in caller workspace and capture error information |
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Entry point to C/C++ or Fortran MEX-file |
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Name of current MEX-function |
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Value of specified Handle Graphics property |
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Copy of variable from specified workspace |
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Read-only pointer to variable from another workspace |
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Determine whether variable has global scope |
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Determine whether MEX-file is locked |
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Prevent clearing MEX-file from memory |
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Make array persist after MEX-file completes |
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Make memory allocated by MATLAB software persist after MEX-function completes |
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ANSI C PRINTF-style output routine |
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Array from MEX-function into specified workspace |
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Set value of specified Handle Graphics property |
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Control response of MEXCALLMATLAB to errors |
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Allow clearing MEX-file from memory |
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Warning message with identifier |
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Warning message |
参考：
http://blog.sciencenet.cn/blog-620659-579885.html
http://blog.csdn.net/raodotcong/article/details/6295859
原文：http://blog.csdn.net/lansatiankongxxc/article/details/38176593