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lab6/task1.c

+#include <stdio.h>
+#include <math.h>
+
+double vectorMagnitude(int vector[3]);
+int dotProduct(int vector[3], int vector2[3]);
+double cosCompare(int vector1[3], int vector2[3]);
+
+int main(){
+	int matrix[4][3] = {
+		{1, 4, 6},
+		{2, -3, 1},
+		{3, 5, 0},
+		{3, 1, -3}
+		};
+	
+	printf("%1f,", cosCompare(matrix[0], matrix[1]));
+	printf("%1f,", cosCompare(matrix[0], matrix[2]));
+	printf("%1f,", cosCompare(matrix[0], matrix[3]));
+	printf("%1f,", cosCompare(matrix[1], matrix[2]));
+	printf("%1f,", cosCompare(matrix[1], matrix[3]));
+	printf("%1f,", cosCompare(matrix[2], matrix[3]));
+
+	return 0;
+	
+}
+
+double vectorMagnitude(int vector[3]){
+	int sumOfSquares = 0;
+	for(int i = 0; i < 3; i++){
+		sumOfSquares += vector[i]*vector[i];
+	}
+	double magnitude = sqrt(sumOfSquares);
+	return magnitude;
+}
+
+int dotProduct(int vector1[3], int vector2[3]){
+	int dot=0;
+	for(int i=0; i < 3; i++){
+		dot += vector1[i] * vector2[i];
+	}
+	return dot;
+}
+
+double cosCompare(int vector1[3], int vector2[3]){
+	int dot = dotProduct(vector1, vector2);
+	
+	double mag1=vectorMagnitude(vector1);
+	double mag2=vectorMagnitude(vector2);
+	
+	double cosine = dot/(mag1*mag2);
+	cosine = acos(cosine);
+	return cosine;
+}
+