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diff --git a/src/stlplus/strings/string_matrix.tpp b/src/stlplus/strings/string_matrix.tpp
new file mode 100644
index 0000000..345d15c
--- /dev/null
+++ b/src/stlplus/strings/string_matrix.tpp
@@ -0,0 +1,35 @@
+////////////////////////////////////////////////////////////////////////////////
+
+//   Author:    Andy Rushton
+//   Copyright: (c) Southampton University 1999-2004
+//              (c) Andy Rushton           2004-2009
+//   License:   BSD License, see ../docs/license.html
+
+////////////////////////////////////////////////////////////////////////////////
+
+namespace stlplus
+{
+
+  ////////////////////////////////////////////////////////////////////////////////
+
+  template<typename T, typename S>
+  std::string matrix_to_string(const matrix<T>& values,
+                               S to_string_fn,
+                               const std::string& column_separator,
+                               const std::string& row_separator)
+  {
+    std::string result;
+    for (unsigned r = 0; r < values.rows(); r++)
+    {
+      if (r != 0) result += row_separator;
+      for (unsigned c = 0; c < values.columns(); c++)
+      {
+        if (c != 0) result += column_separator;
+        result += to_string_fn(values(r,c));
+      }
+    }
+    return result;
+  }
+
+} // end namespace stlplus
+