fix hw3 some changes

hws/hw3/matutil.h

@@ -0,0 +1,38 @@
+#ifndef __MATUTIL_H__
+#define __MATUTIL_H__
+
+#include <stdlib.h>
+#include "nr.h"
+#include "nrutil.h"
+
+
+void print_vector_float(int size, float* v);
+
+void print_vector_int(int size, int* v);
+
+
+
+float **new_matrix(int m, int n);
+
+void print_matrix(int m, int n, float **mat);
+
+void copy_matrix(int m, int n, float **src, float **dst);
+
+void simple_free_matrix(int m, int n, float **mat);
+
+/**
+ * a struct for get solution of ax = b
+ */
+typedef struct JMatrixData {
+    int m, n;
+    float **a;
+    float **b;
+} JMatrixData;
+
+JMatrixData* new_jmatdata(int m, int n);
+
+void free_jmatdata(JMatrixData* data);
+
+void copy_jmatdata(JMatrixData *src, JMatrixData *dst);
+
+#endif