diff --git a/test2/main.cpp b/test2/main.cpp
index 9d62028..bef3737 100644
--- a/test2/main.cpp
+++ b/test2/main.cpp
@@ -13,7 +13,7 @@
 
 #include <unistd.h>
 
-#define MSIZE 64
+#define MSIZE 32
 
 static std::vector<uint32_t> compile_shader(const std::string &source)
 {
@@ -61,6 +61,32 @@ std::string replacewith(const char *needle, T val, std::string str)
 	return str;
 }
 
+void print_matrix(float m[], size_t w, size_t h)
+{
+	for (size_t y = 0; y < h; y++) {
+		for (size_t x = 0; x < w; x++) {
+			printf("%.1f ", m[y * w + x]);
+		}
+		printf("\n");
+	}
+}
+
+void fill_identity(float m[], size_t w, size_t h)
+{
+	for (size_t y = 0; y < h; y++) {
+		m[y * w + y] = 1.0;
+	}
+}
+
+void fill_garbage(float m[], size_t w, size_t h)
+{
+	for (size_t y = 0; y < h; y++) {
+		for (size_t x = 0; x < w; x++) {
+			m[y * w + x] = x * 0.74 - y * 0.22;
+		}
+	}
+}
+
 // compute C = A*B on the GPU
 int main()
 {
@@ -76,19 +102,9 @@ int main()
 	float matrixA[MSIZE][MSIZE] = {0};
 	float matrixB[MSIZE][MSIZE] = {0};
 	float matrixC[MSIZE][MSIZE] = {0};
-	// fill an identity matrix
-	for (int y = 0; y < MSIZE; y++) {
-		matrixA[y][y] = 1.0;
-		matrixB[y][y] = 2.0;
-	}
-	// fill a matrix with data
-	/*
-	for (int y = 0; y < MSIZE; y++) {
-		for (int x = 0; x < MSIZE; x++) {
-			matrixB[y][x] = x * 0.74 - y * 0.22;
-		}
-	}
-	*/
+
+	fill_garbage((float *)matrixA, MSIZE, MSIZE);
+	matrixB[0][0] = 1.0;
 
 	// create the tensors, tensors are just arrays, in the shader we will have
 	// to describe how it translates to matrices
@@ -164,13 +180,12 @@ int main()
 	printf("\n");
 
 	// print the resulting matrix
-	for (int y = 0; y < MSIZE; y++) {
-		for (int x = 0; x < MSIZE; x++) {
-			float elem = tensorC->vector<float>().at(y * MSIZE + x);
-			printf("%.1f ", elem);
-		}
-		printf("\n");
-	}
+	printf("matrixA:\n");
+	print_matrix(&tensorA->vector<float>()[0], MSIZE, MSIZE);
+	printf("matrixB:\n");
+	print_matrix(&tensorB->vector<float>()[0], MSIZE, MSIZE);
+	printf("matrixC:\n");
+	print_matrix(&tensorC->vector<float>()[0], MSIZE, MSIZE);
 
 	return 0;
 }