[math] Sparse matrix from dense

src/sparse_matrix_utils.c

@@ -0,0 +1,19 @@
+#include "sparse_matrix_utils.h"
+#include "float_utils.h"
+#include "matrix.h"
+
+
+sparse_matrix_t *sparse_matrix_new_from_matrix(matrix_t *matrix) {
+    sparse_matrix_t *sparse = sparse_matrix_new_shape(matrix->m, matrix->n);
+
+    for (size_t i = 0; i < matrix->m; i++) {
+        for (size_t j = 0; j < matrix->n; j++) {    
+            double value = matrix_get(matrix, i, j);
+            if (!double_equals(value, 0.0)) {
+                sparse_matrix_append(sparse, j, value);
+            }
+        }
+        sparse_matrix_finalize_row(sparse);
+    }
+    return sparse;
+}