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diff --git a/include/ixion/matrix.hpp b/include/ixion/matrix.hpp
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_IXION_MATRIX_HPP
+#define INCLUDED_IXION_MATRIX_HPP
+
+#include "types.hpp"
+
+#include <memory>
+#include <vector>
+#include <string>
+#include <variant>
+
+namespace ixion {
+
+class numeric_matrix;
+
+/**
+ * 2-dimensional matrix consisting of elements of variable types.  Each
+ * element can be numeric, string, or empty.  This class is used to
+ * represent range values or in-line matrices.
+ */
+class IXION_DLLPUBLIC matrix
+{
+    struct impl;
+    std::unique_ptr<impl> mp_impl;
+
+public:
+
+    enum class element_type { numeric, string, boolean, error, empty };
+
+    struct element
+    {
+        using value_type = std::variant<double, bool, std::string_view, formula_error_t>;
+
+        element_type type;
+        value_type value;
+    };
+
+    matrix();
+    matrix(size_t rows, size_t cols);
+    matrix(size_t rows, size_t cols, double numeric);
+    matrix(size_t rows, size_t cols, bool boolean);
+    matrix(size_t rows, size_t cols, const std::string& str);
+    matrix(size_t rows, size_t cols, formula_error_t error);
+    matrix(const matrix& other);
+    matrix(matrix&& other);
+    matrix(const numeric_matrix& other);
+    ~matrix();
+
+    matrix& operator= (matrix other);
+
+    /**
+     * Determine if the entire matrix consists only of numeric value elements.
+     *
+     * @return true if the entire matrix consits only of numeric value
+     *         elements, false otherwise.
+     */
+    bool is_numeric() const;
+
+    bool get_boolean(size_t row, size_t col) const;
+    bool is_numeric(size_t row, size_t col) const;
+    double get_numeric(size_t row, size_t col) const;
+    void set(size_t row, size_t col, double val);
+    void set(size_t row, size_t col, bool val);
+    void set(size_t row, size_t col, const std::string& str);
+    void set(size_t row, size_t col, formula_error_t val);
+
+    element get(size_t row, size_t col) const;
+
+    size_t row_size() const;
+    size_t col_size() const;
+
+    void swap(matrix& r);
+
+    numeric_matrix as_numeric() const;
+
+    bool operator== (const matrix& r) const;
+    bool operator!= (const matrix& r) const;
+};
+
+class IXION_DLLPUBLIC numeric_matrix
+{
+    friend class matrix;
+
+    struct impl;
+    std::unique_ptr<impl> mp_impl;
+
+public:
+    numeric_matrix();
+    numeric_matrix(size_t rows, size_t cols);
+
+    /**
+     * Constructor with initial values.
+     *
+     * @param array  Array of initial values stored in column-major order.
+     * @param rows Number of rows.
+     * @param cols Number of columns.
+     */
+    numeric_matrix(std::vector<double> array, size_t rows, size_t cols);
+    numeric_matrix(numeric_matrix&& r);
+    ~numeric_matrix();
+
+    numeric_matrix& operator= (numeric_matrix other);
+
+    double& operator() (size_t row, size_t col);
+    const double& operator() (size_t row, size_t col) const;
+
+    void swap(numeric_matrix& r);
+
+    size_t row_size() const;
+    size_t col_size() const;
+};
+
+}
+
+#endif
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */