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matrix.cpp
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matrix.cpp
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#include "matrix.h"
#include <algorithm>
#include <stdexcept>
#include <thread>
#include <vector>
Matrix::Matrix() : rows_(0), cols_(0), data_() {}
Matrix::Matrix(size_t rows, size_t cols) : rows_(rows), cols_(cols), data_(rows * cols, 0) {}
Matrix::Matrix(const Matrix& other) : rows_(other.rows_), cols_(other.cols_), data_(other.data_) {}
Matrix::Matrix(Matrix&& other) noexcept : rows_(other.rows_), cols_(other.cols_), data_(std::move(other.data_)) {
other.rows_ = 0;
other.cols_ = 0;
}
Matrix::~Matrix() {}
double Matrix::get(size_t row, size_t col) const {
return data_[row * cols_ + col];
}
void Matrix::set(size_t row, size_t col, double value) {
data_[row * cols_ + col] = value;
}
size_t Matrix::rows() const {
return rows_;
}
size_t Matrix::cols() const {
return cols_;
}
void Matrix::fill(double value) {
std::fill(data_.begin(), data_.end(), value);
}
Matrix Matrix::operator*(const Matrix& other) const {
if (cols_ != other.rows_) {
throw std::invalid_argument("Matrix dimensions do not match for multiplication");
}
Matrix result(rows_, other.cols_);
std::vector<std::thread> threads;
auto worker = [&](size_t start, size_t end) {
for (size_t i = start; i < end; ++i) {
for (size_t j = 0; j < other.cols_; ++j) {
for (size_t k = 0; k < cols_; ++k) {
result.set(i, j, result.get(i, j) + get(i, k) * other.get(k, j));
}
}
}
};
size_t num_threads = std::thread::hardware_concurrency();
size_t chunk_size = (rows_ + num_threads - 1) / num_threads;
for (size_t t = 0; t < num_threads; ++t) {
size_t start = t * chunk_size;
size_t end = std::min(start + chunk_size, rows_);
threads.emplace_back(worker, start, end);
}
for (auto& thread : threads) {
thread.join();
}
return result;
}
Matrix Matrix::transpose() const {
Matrix result(cols_, rows_);
for (size_t i = 0; i < rows_; ++i) {
for (size_t j = 0; j < cols_; ++j) {
result.set(j, i, get(i, j));
}
}
return result;
}
extern "C" {
Matrix* Matrix_new(size_t rows, size_t cols) {
return new Matrix(rows, cols);
}
void Matrix_delete(Matrix* m) {
delete m;
}
double Matrix_get(const Matrix* m, size_t row, size_t col) {
return m->get(row, col);
}
void Matrix_set(Matrix* m, size_t row, size_t col, double value) {
m->set(row, col, value);
}
size_t Matrix_rows(const Matrix* m) {
return m->rows();
}
size_t Matrix_cols(const Matrix* m) {
return m->cols();
}
void Matrix_fill(Matrix* m, double value) {
m->fill(value);
}
Matrix* Matrix_multiply(const Matrix* a, const Matrix* b) {
return new Matrix(*a * *b);
}
Matrix* Matrix_transpose(const Matrix* m) {
return new Matrix(m->transpose());
}
}