VC和matleb混合編程之mx矩陣賦值（C語言），matlebmx

VC和matleb混合編程之mx矩陣賦值（C語言），matlebmx

將vector容器x,y的資料轉換為matlab矩陣mxMatrix的幾種賦值方式：
1：

memcpy(mxGetPr(mxa_x),&x[0], y.size()*sizeof(double));memcpy(mxGetPr(mxa_y),&y[0], y.size()*sizeof(double));//OK

&x[0]：即是容器元素的首地址
2.

memcpy(mxGetPr(mxa_x),&x.at(0), y.size()*sizeof(double));memcpy(mxGetPr(mxa_y),&y.at(0), y.size()*sizeof(double));//OK

3.

memcpy(mxGetPr(mxa_x),(void*)&(*x.begin()), y.size()*sizeof(double));memcpy(mxGetPr(mxa_y),(void*)&(*y.begin()), y.size()*sizeof(double));//OK

&(*x.begin())：表示vector容器的元素的首地址
4 使用copy函數

copy(x.begin(),x.end(),mxGetPr(mxa_x));copy(y.begin(),y.end(),mxGetPr(mxa_y));//OK

5.
使用matlab函數的庫的操作函數

mxSetPr(mxa_x,&x[0]);mxSetPr(mxa_y,&y[0]);//OK，**但是不能釋放記憶體空間**

6.
mxSetData函數暫時未實現

代碼如下：

bool ellipsefit_engine(Engine *ep,double &Xc,double &Yc,double &A,double &B,double &Phi,double &P,vector<double> x,vector<double> y){    mxArray *mxa_x, *mxa_y;    mxArray *mxa_Xc = NULL,*mxa_Yc = NULL,*mxa_A = NULL,*mxa_B = NULL,*mxa_Phi = NULL,*mxa_P = NULL;    mxa_x = mxCreateDoubleMatrix(x.size(),1 , mxREAL);    mxa_y = mxCreateDoubleMatrix(y.size(),1 , mxREAL);    //memcpy(mxGetPr(mxa_x),&x[0], y.size()*sizeof(double));    //memcpy(mxGetPr(mxa_y),&y[0], y.size()*sizeof(double));//OK    //memcpy(mxGetPr(mxa_x),&x.at(0), y.size()*sizeof(double));    //memcpy(mxGetPr(mxa_y),&y.at(0), y.size()*sizeof(double));//OK    //memcpy(mxGetPr(mxa_x),(void*)&(*x.begin()), y.size()*sizeof(double));    //memcpy(mxGetPr(mxa_y),(void*)&(*y.begin()), y.size()*sizeof(double));//OK    //copy(x.begin(),x.end(),mxGetPr(mxa_x));    //copy(y.begin(),y.end(),mxGetPr(mxa_y));//OK    //mxSetPr(mxa_x,&x[0]);    //mxSetPr(mxa_y,&y[0]);//OK，但是不能釋放記憶體空間    //mlfEllipsefit(6, &mxa_Xc,&mxa_Yc,&mxa_A,&mxa_B,&mxa_Phi,&mxa_P, mxa_x, mxa_x);    engPutVariable(ep,"x",mxa_x);    engPutVariable(ep,"y",mxa_y);    mxDestroyArray(mxa_x);    mxDestroyArray(mxa_y);    engEvalString(ep,"userpath('C:\Users\Administrator\Desktop\eclipse_c\test');");    engEvalString(ep,"[Xc,Yc,A,B,Phi,P]=ellipsefit(x,y);");    mxa_Xc=engGetVariable(ep,"Xc");    mxa_Yc=engGetVariable(ep,"Yc");    mxa_A=engGetVariable(ep,"A");    mxa_B=engGetVariable(ep,"B");    mxa_Phi=engGetVariable(ep,"Phi");    mxa_P=engGetVariable(ep,"P");    double *p_Xc = mxGetPr(mxa_Xc);// 將 matlab 中的矩陣的指標傳遞給 C 語言中的指向 double 的指標    Xc=p_Xc[0];    double *p_Yc =mxGetPr(mxa_Yc);    Yc = p_Yc[0];    double *p_A =mxGetPr(mxa_A);    A = p_A[0];    double *p_B =mxGetPr(mxa_B);    B = p_B[0];    double *p_Phi =mxGetPr(mxa_Phi);    Phi = p_Phi[0];    double *p_P =mxGetPr(mxa_P);    P = p_P[0];    return true;}