Added overloads of mat() that convert a single scalar into a matrix.

dlib/matrix/matrix_mat.h

@@ -469,6 +469,35 @@ namespace dlib
     }
 
 // ----------------------------------------------------------------------------------------
+// ----------------------------------------------------------------------------------------
+
+    inline matrix<double,1,1> mat (
+        double value
+    )
+    {
+        matrix<double,1,1> temp;
+        temp(0) = value;
+        return temp;
+    }
+
+    inline matrix<float,1,1> mat (
+        float value
+    )
+    {
+        matrix<float,1,1> temp;
+        temp(0) = value;
+        return temp;
+    }
+
+    inline matrix<long double,1,1> mat (
+        long double value
+    )
+    {
+        matrix<long double,1,1> temp;
+        temp(0) = value;
+        return temp;
+    }
+
 // ----------------------------------------------------------------------------------------
 
 }

dlib/matrix/matrix_mat_abstract.h

@@ -188,6 +188,17 @@ namespace dlib
                   R(r,c) == m(r,c)
     !*/
 
+// ----------------------------------------------------------------------------------------
+
+    matrix<double,1,1>      mat (double value);
+    matrix<float,1,1>       mat (float value);
+    matrix<long double,1,1> mat (long double value);
+    /*!
+        ensures
+            - Converts a scalar into a matrix containing just that scalar and returns the
+              results.
+    !*/
+
 // ----------------------------------------------------------------------------------------
 
 }