1 files changed, 72 insertions, 0 deletions
diff --git a/src/matrix.cpp b/src/matrix.cpp
new file mode 100644
index 0000000..dd19e02
--- /dev/null
+++ b/src/matrix.cpp
@@ -0,0 +1,72 @@
+#include "matrix.hpp"
+
+#include <algorithm>
+#include <stdexcept>
+
+namespace linalg {
+
+Matrix::Matrix(std::size_t rows, std::size_t cols)
+    : rows_(rows), cols_(cols), data_(rows * cols) {}
+
+Matrix::Matrix(std::size_t rows, std::size_t cols, double value)
+    : rows_(rows), cols_(cols), data_(rows * cols, value) {}
+
+Matrix::Matrix(std::initializer_list<std::initializer_list<double>> values) : rows_(values.size()) {
+    if (rows_ == 0) {
+        cols_ = 0;
+        return;
+    }
+
+    cols_ = values.begin()->size();
+    data_.reserve(rows_ * cols_);
+
+    for (const auto& row : values) {
+        if (row.size() != cols_) {
+            throw std::invalid_argument("Matrix initializer rows must have equal length");
+        }
+        data_.insert(data_.end(), row.begin(), row.end());
+    }
+}
+
+
+std::size_t Matrix::rows() const noexcept { return rows_; }
+
+std::size_t Matrix::cols() const noexcept { return cols_; }
+
+bool Matrix::empty() const noexcept { return data_.empty(); }
+
+double& Matrix::operator()(std::size_t i, std::size_t j) {
+    check_bounds(i, j);
+    return data_[index(i, j)];
+}
+
+const double& Matrix::operator()(std::size_t i, std::size_t j) const {
+    check_bounds(i, j);
+    return data_[index(i, j)];
+}
+
+void Matrix::fill(double value) { std::fill(data_.begin(), data_.end(), value); }
+
+double* Matrix::data() noexcept { return data_.data(); }
+
+const double* Matrix::data() const noexcept { return data_.data(); }
+
+Matrix Matrix::identity(std::size_t n) {
+    Matrix result(n, n);
+    for (std::size_t i = 0; i < n; ++i) {
+        result(i, i) = 1.0;
+    }
+    return result;
+}
+
+Matrix Matrix::zeros(std::size_t rows, std::size_t cols) { return Matrix(rows, cols, 0.0); }
+
+std::size_t Matrix::index(std::size_t i, std::size_t j) const { return i * cols_ + j; }
+
+void Matrix::check_bounds(std::size_t i, std::size_t j) const {
+    if (i >= rows_ || j >= cols_) {
+        throw std::out_of_range("Matrix index out of bounds");
+    }
+}
+
+}  // namespace linalg