old-nall/matrix.hpp
2016-07-03 13:35:22 +02:00

30 lines
728 B
C++

#pragma once
namespace nall {
namespace Matrix {
template<typename T> inline auto Multiply(T* output, const T* xdata, uint xrows, uint xcols, const T* ydata, uint yrows, uint ycols) -> void {
if(xcols != yrows) return;
for(uint y : range(xrows)) {
for(uint x : range(ycols)) {
T sum = 0;
for(uint z : range(xcols)) {
sum += xdata[y * xcols + z] * ydata[z * ycols + x];
}
*output++ = sum;
}
}
}
template<typename T> inline auto Multiply(const T* xdata, uint xrows, uint xcols, const T* ydata, uint yrows, uint ycols) -> vector<T> {
vector<T> output;
output.resize(xrows * ycols);
Multiply(output.data(), xdata, xrows, xcols, ydata, yrows, ycols);
return output;
}
}
}