Changed code due to changes in Cwrapper, started spec

Author: rajithv

ext/symengine/ruby_matrix.c

@@ -119,7 +119,7 @@ VALUE cmatrix_dense_init(VALUE self, VALUE args)
                     counter++;
                 }
             }
-            dense_matrix_set_vec(this, rows, cols, cargs);
+            this = dense_matrix_new_vec(rows, cols, cargs);
 
             basic_free_stack(x);
             vecbasic_free(cargs);
@@ -544,7 +544,7 @@ VALUE cmatrix_dense_FFLDU(VALUE self)
     VALUE result_u;
     cresult_u = dense_matrix_new();
 
-    dense_matrix_LDL(cresult_l, cresult_d, this);
+    dense_matrix_FFLDU(cresult_l, cresult_d, cresult_u, this);
 
     result_l = Data_Wrap_Struct(c_dense_matrix, NULL, dense_matrix_free,
                               cresult_l);

ext/symengine/ruby_utils.c

@@ -8,7 +8,7 @@ VALUE cutils_sympify(VALUE self, VALUE operand)
 
     if(strcmp(s, "Array") == 0) {
 
-        CDenseMatrix *mat_result = dense_matrix_new();
+        CDenseMatrix *mat_result;
         int counter = 0;
 
         int rows = RARRAY_LEN(operand);
@@ -40,7 +40,7 @@ VALUE cutils_sympify(VALUE self, VALUE operand)
             }
         }
 
-        dense_matrix_set_vec(mat_result, rows, cols, cargs);
+        mat_result = dense_matrix_new_vec(rows, cols, cargs);
 
         basic_free_stack(x);
         vecbasic_free(cargs);

spec/matrix_spec.rb

@@ -0,0 +1,23 @@
+describe SymEngine::DenseMatrix do
+  describe 'convert' do
+    subject { SymEngine([[1, 2],[3, 4]]) }
+    
+    it { is_expected.to be_a SymEngine::DenseMatrix }
+    its(:to_s) { is_expected.to eq "[1, 2]\n[3, 4]\n" }
+  end
+  
+  describe 'dense_matrix functions' do
+    subject { SymEngine([[4, 3],[3, 2]]) }
+    
+    its(:inv) { is_expected.to be_a SymEngine::DenseMatrix }
+    its(:inv) { is_expected.to eq SymEngine([[-2, 3],[3, -4]]) }
+    
+    its(:FFLU) { is_expected.to be_a SymEngine::DenseMatrix }
+    its(:FFLU) { is_expected.to eq SymEngine([[4, 3],[3, -1]]) }
+    
+    #its(:LU) { is_expected.to eq [SymEngine([[1, 0],[3/4, 1]]), SymEngine([[4, 3],[0, -1/4]])] }
+    
+    
+  end
+  
+end