amiro-os / include / Matrix.h @ 05d54823
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#ifndef MATRIX_H_
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#define MATRIX_H_
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#include <algorithm> // std::fill, std::copy |
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namespace Matrix {
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typedef unsigned int uint; |
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/**
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* Multiplication of two matrices Z=X*Y
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*
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* @param *X Pointer to first element of first matrix
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* @param Xrows Rows of X
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* @param Xcols Cols of X
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* @param *Y Pointer to first element of second matrix
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* @param Yrows Rows of Y
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* @param Ycols Cols of Y
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* @param *Z Pointer to first element of result matrix (needs to be init with 0)
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* @param Zrows Rows of Z
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* @param Zcols Cols of Z
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*/
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template <typename T> |
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void XdotY(T* X,uint Xrows,uint Xcols,T* Y,uint Yrows, uint Ycols,T* Z, uint Zrows,uint Zcols) {
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// Check if the multiplication will work
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// if (Zrows != Xrows || Zcols != Ycols || Xcols != Yrows) {
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// return 1;
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// }
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// Do the multiplication
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// Z_{i,k} = sum_{n} X_{i,n} * Y_{n,k}
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for (uint i = 0; i < Zrows; i++) { |
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for (uint k = 0; k < Zcols; k++) { |
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for (uint n = 0; n < Xcols; n++) { |
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Z[i*Zcols+k] += X[i*Xcols+n] * Y[n*Ycols+k]; |
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} |
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} |
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} |
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// return 0;
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}; |
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/**
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* Multiplication of two matrices Z=X*Y^{T},
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* while Y will be transposed during calculation
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*
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* @param *X Pointer to first element of first matrix
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* @param Xrows Rows of X
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* @param Xcols Cols of X
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* @param *Y Pointer to first element of second matrix
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* @param Yrows Rows of Y
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* @param Ycols Cols of Y
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* @param *Z Pointer to first element of result matrix (needs to be init with 0)
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* @param Zrows Rows of Z
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* @param Zcols Cols of Z
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*/
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template <typename T> |
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void XdotYtrans(T* X,uint Xrows,uint Xcols,T* Y,uint Yrows, uint Ycols,T* Z, uint Zrows,uint Zcols) {
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// Check if the multiplication will work
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// if (Zrows != Xrows || Zcols != Yrows || Xcols != Ycols) {
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// return 1;
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// }
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// Do the multiplication
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// Z_{i,k} = sum_{n} X_{i,n} * Y_{k,n}
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for (uint i = 0; i < Zrows; i++) { |
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for (uint k = 0; k < Zcols; k++) { |
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for (uint n = 0; n < Xcols; n++) { |
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Z[i*Zcols+k] += X[i*Xcols+n] * Y[n+k*Ycols]; |
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} |
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} |
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} |
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// return 0;
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}; |
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/**
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* Multiplication of two matrices Z=X^{T}*Y,
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* while X will be transposed during calculation
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*
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* @param *X Pointer to first element of first of matrix
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* @param Xrows Rows of X
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* @param Xcols Cols of X
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* @param *Y Pointer to first element of second matrix
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* @param Yrows Rows of Y
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* @param Ycols Cols of Y
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* @param *Z Pointer to first element of result matrix (needs to be init with 0)
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* @param Zrows Rows of Z
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* @param Zcols Cols of Z
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*/
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template <typename T> |
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void XtransDotY(T* X, uint Xrows,uint Xcols,T* Y,uint Yrows, uint Ycols,T* Z, uint Zrows,uint Zcols) {
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// Check if the multiplication will work
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// if (Zrows != Xrows || Zcols != Yrows || Xcols != Ycols) {
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// return 1;
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// }
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// Do the multiplication
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// Z_{i,k} = sum_{n} X_{n,i} * Y_{k,n}
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for (uint i = 0; i < Zrows; i++) { |
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for (uint k = 0; k < Zcols; k++) { |
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for (uint n = 0; n < Xcols; n++) { |
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Z[i*Zcols+k] += X[n*Xcols+i] * Y[n+k*Ycols]; |
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} |
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} |
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} |
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// return 0;
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}; |
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/**
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* Addition of two matrices Z=X+Y,
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*
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* @param *X Pointer to first element of first matrix
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* @param Xrows Rows of X
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* @param Xcols Cols of X
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* @param *Y Pointer to first element of second matrix
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* @param Yrows Rows of Y
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* @param Ycols Cols of Y
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* @param *Z Pointer to first element of result matrix (needs to be init with 0)
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* @param Zrows Rows of Z
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* @param Zcols Cols of Z
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*/
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template <typename T> |
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void XplusY(T* X,uint Xrows,uint Xcols,T* Y,uint Yrows, uint Ycols,T* Z, uint Zrows,uint Zcols) {
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// Check if the multiplication will work
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// if (Zrows != Xrows || Xrows != Yrows || Zcols != Ycols || Ycols != Xcols {
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// return 1;
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// }
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// Do the summation
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for (uint idx = 0; idx < Xrows*Xcols; idx++) { |
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Z[idx] += X[idx] + Y[idx]; |
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} |
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// return 0;
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}; |
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/**
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* Initializing matrix with any element
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*
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* @param *X Pointer to first element of first matrix
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* @param Xrows Rows of X
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* @param Xcols Cols of X
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* @param value value of all elements
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*/
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template <typename T> |
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void init(T* X, uint Xrows, uint Xcols, T value) {
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std::fill (X,X+Xrows*Xcols,value); |
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}; |
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/**
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* Copy a matrix Y=X
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*
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* @param *X Pointer to first element of source matrix
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* @param Xrows Rows of X
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* @param Xcols Cols of X
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* @param *Y Pointer to first element of result matrix
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* @param Yrows Rows of Y
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* @param Ycols Cols of Y
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*
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*/
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template <typename T> |
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void copy(T* X, uint Xrows, uint Xcols, T* Y, uint Yrows, uint Ycols) {
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// if (Xrows != Yrows || Xcols != Ycols ) {
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// return 1;
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// }
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std::copy (X,X+Xrows*Xcols,Y); |
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// return 0;
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}; |
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} |
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#endif /* MATRIX_ */ |