Added the zeros_matrix(), ones_matrix() functions. I also changed the pointwise_multiply()

and complex_matrix() functions so that they are a little more convenient when dealing
with complex types.

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%403020

dlib/matrix/matrix_math_functions.h

@@ -416,7 +416,34 @@ DLIB_MATRIX_SIMPLE_STD_FUNCTION(atan,7)
 
 // ----------------------------------------------------------------------------------------
 
-    struct op_complex_matrix
+    struct op_complex_matrix 
+    {
+        template <typename EXP>
+        struct op : has_nondestructive_aliasing, preserves_dimensions<EXP>
+        {
+            const static long cost = EXP::cost+1;
+            typedef std::complex<typename EXP::type> type;
+            template <typename M>
+            static type apply ( const M& m, long r, long c)
+            { 
+                return type(m(r,c));
+            }
+        };
+    };
+
+    template <
+        typename EXP
+        >
+    const matrix_unary_exp<EXP,op_complex_matrix> complex_matrix (
+        const matrix_exp<EXP>& m
+    )
+    {
+        return matrix_unary_exp<EXP,op_complex_matrix>(m.ref());
+    }
+
+// ----------------------------------------------------------------------------------------
+
+    struct op_complex_matrix2
     {
         template <typename EXP1, typename EXP2>
         struct op : has_nondestructive_aliasing, preserves_dimensions<EXP1,EXP2>
@@ -434,7 +461,7 @@ DLIB_MATRIX_SIMPLE_STD_FUNCTION(atan,7)
         typename EXP1,
         typename EXP2
         >
-    const matrix_binary_exp<EXP1,EXP2,op_complex_matrix> complex_matrix (
+    const matrix_binary_exp<EXP1,EXP2,op_complex_matrix2> complex_matrix (
         const matrix_exp<EXP1>& real_part,
         const matrix_exp<EXP2>& imag_part 
     )
@@ -452,7 +479,7 @@ DLIB_MATRIX_SIMPLE_STD_FUNCTION(atan,7)
             << "\n\timag_part.nr(): " << imag_part.nr()
             << "\n\timag_part.nc(): " << imag_part.nc() 
             );
-        typedef matrix_binary_exp<EXP1,EXP2,op_complex_matrix> exp;
+        typedef matrix_binary_exp<EXP1,EXP2,op_complex_matrix2> exp;
         return exp(real_part.ref(),imag_part.ref());
     }
 

dlib/matrix/matrix_math_functions_abstract.h

@@ -369,6 +369,20 @@ namespace dlib
                   R(r,c) == std::real(m(r,c))
     !*/
 
+// ----------------------------------------------------------------------------------------
+
+    const matrix_exp complex_matrix (
+        const matrix_exp& real_part
+    );
+    /*!
+        ensures
+            - returns a matrix R such that:
+                - R::type == std::complex<T> where T is whatever type real_part used.
+                - R has the same dimensions as real_part. 
+                - for all valid r and c:
+                  R(r,c) == std::complex(real_part(r,c), 0)
+    !*/
+
 // ----------------------------------------------------------------------------------------
 
     const matrix_exp complex_matrix (

dlib/matrix/matrix_utilities.h

@@ -1049,7 +1049,7 @@ namespace dlib
     )
     {
         DLIB_ASSERT(nr > 0 && nc > 0, 
-            "\tconst matrix_exp uniform_matrix<T>(nr, nc)"
+            "\tconst matrix_exp uniform_matrix<T>(nr, nc, val)"
             << "\n\tnr and nc have to be bigger than 0"
             << "\n\tnr: " << nr
             << "\n\tnc: " << nc
@@ -1058,6 +1058,46 @@ namespace dlib
         return exp(nr,nc,val);
     }
 
+// ----------------------------------------------------------------------------------------
+
+    template <
+        typename T
+        >
+    const dynamic_matrix_scalar_unary_exp<T,op_uniform_matrix_3<T> > zeros_matrix (
+        long nr,
+        long nc
+    )
+    {
+        DLIB_ASSERT(nr > 0 && nc > 0, 
+            "\tconst matrix_exp zeros_matrix<T>(nr, nc)"
+            << "\n\tnr and nc have to be bigger than 0"
+            << "\n\tnr: " << nr
+            << "\n\tnc: " << nc
+            );
+        typedef dynamic_matrix_scalar_unary_exp<T,op_uniform_matrix_3<T> > exp;
+        return exp(nr,nc,0);
+    }
+
+// ----------------------------------------------------------------------------------------
+
+    template <
+        typename T
+        >
+    const dynamic_matrix_scalar_unary_exp<T,op_uniform_matrix_3<T> > ones_matrix (
+        long nr,
+        long nc
+    )
+    {
+        DLIB_ASSERT(nr > 0 && nc > 0, 
+            "\tconst matrix_exp ones_matrix<T>(nr, nc)"
+            << "\n\tnr and nc have to be bigger than 0"
+            << "\n\tnr: " << nr
+            << "\n\tnc: " << nc
+            );
+        typedef dynamic_matrix_scalar_unary_exp<T,op_uniform_matrix_3<T> > exp;
+        return exp(nr,nc,1);
+    }
+
 // ----------------------------------------------------------------------------------------
 
     template <
@@ -1224,12 +1264,20 @@ namespace dlib
 
 // ----------------------------------------------------------------------------------------
 
+
     struct op_pointwise_multiply
     {
+        // A template to tell me if two types can be multiplied together in a sensible way.  Here
+        // I'm saying it is ok if they are both the same type or one is the complex version of the other.
+        template <typename T, typename U> struct compatible { static const bool value = false;  typedef T type; };
+        template <typename T>             struct compatible<T,T> { static const bool value = true; typedef T type; };
+        template <typename T>             struct compatible<std::complex<T>,T> { static const bool value = true; typedef std::complex<T> type;  };
+        template <typename T>             struct compatible<T,std::complex<T> > { static const bool value = true; typedef std::complex<T> type; };
+
         template <typename EXP1, typename EXP2>
         struct op : public has_nondestructive_aliasing, public preserves_dimensions<EXP1,EXP2>
         {
-            typedef typename EXP1::type type;
+            typedef typename compatible<typename EXP1::type, typename EXP2::type>::type type;
             const static long cost = EXP1::cost + EXP2::cost + 1;
 
             template <typename M1, typename M2>
@@ -1247,7 +1295,7 @@ namespace dlib
         const matrix_exp<EXP2>& b 
     )
     {
-        COMPILE_TIME_ASSERT((is_same_type<typename EXP1::type,typename EXP2::type>::value == true));
+        COMPILE_TIME_ASSERT((op_pointwise_multiply::compatible<typename EXP1::type,typename EXP2::type>::value == true));
         COMPILE_TIME_ASSERT(EXP1::NR == EXP2::NR || EXP1::NR == 0 || EXP2::NR == 0);
         COMPILE_TIME_ASSERT(EXP1::NC == EXP2::NC || EXP1::NC == 0 || EXP2::NC == 0);
         DLIB_ASSERT(a.nr() == b.nr() &&

dlib/matrix/matrix_utilities_abstract.h

@@ -178,6 +178,38 @@ namespace dlib
             - returns an nr by nc matrix with elements of type T and all set to val.
     !*/
 
+// ----------------------------------------------------------------------------------------
+
+    template <
+        typename T
+        >
+    const matrix_exp ones_matrix (
+        long nr,
+        long nc
+    );
+    /*!
+        requires
+            - nr > 0 && nc > 0
+        ensures
+            - returns uniform_matrix<T>(nr, nc, 1)
+    !*/
+
+// ----------------------------------------------------------------------------------------
+
+    template <
+        typename T
+        >
+    const matrix_exp zeros_matrix (
+        long nr,
+        long nc
+    );
+    /*!
+        requires
+            - nr > 0 && nc > 0
+        ensures
+            - returns uniform_matrix<T>(nr, nc, 0)
+    !*/
+
 // ----------------------------------------------------------------------------------------
 
     template <
@@ -493,7 +525,9 @@ namespace dlib
         requires
             - a.nr() == b.nr()
             - a.nc() == b.nc()
-            - a and b both contain the same type of element
+            - a and b both contain the same type of element (one or both
+              can also be of type std::complex so long as the underlying type
+              in them is the same)
         ensures
             - returns a matrix R such that:
                 - R::type == the same type that was in a and b.

dlib/test/matrix.cpp

@@ -1001,6 +1001,20 @@ namespace
 
         }
 
+        {
+            DLIB_TEST((uniform_matrix<double>(4,5,1) == ones_matrix<double>(4,5)));
+            DLIB_TEST((uniform_matrix<double>(4,5,0) == zeros_matrix<double>(4,5)));
+            DLIB_TEST((uniform_matrix<float>(4,5,1) == ones_matrix<float>(4,5)));
+            DLIB_TEST((uniform_matrix<float>(4,5,0) == zeros_matrix<float>(4,5)));
+            DLIB_TEST((uniform_matrix<complex<double> >(4,5,1) == ones_matrix<complex<double> >(4,5)));
+            DLIB_TEST((uniform_matrix<complex<double> >(4,5,0) == zeros_matrix<complex<double> >(4,5)));
+            DLIB_TEST((uniform_matrix<complex<float> >(4,5,1) == ones_matrix<complex<float> >(4,5)));
+            DLIB_TEST((uniform_matrix<complex<float> >(4,5,0) == zeros_matrix<complex<float> >(4,5)));
+            DLIB_TEST((complex_matrix(ones_matrix<double>(3,3), zeros_matrix<double>(3,3)) == complex_matrix(ones_matrix<double>(3,3))));
+            DLIB_TEST((pointwise_multiply(complex_matrix(ones_matrix<double>(3,3)), ones_matrix<double>(3,3)*2) ==
+                       complex_matrix(2*ones_matrix<double>(3,3))));
+        }
+
         {
             DLIB_TEST(( uniform_matrix<double>(303,303, 3)*identity_matrix<double>(303) == uniform_matrix<double,303,303>(3) ) );
             DLIB_TEST(( uniform_matrix<double,303,303>(3)*identity_matrix<double,303>() == uniform_matrix<double,303,303>(3) ));