Euclidian Norm

 1/* Programmed by David Isaacson, 2003
 2 * Released into the Public Domain
 3 *
 4 * euclidiannorm.c
 5 *
 6 * This program will find the euclidian norm of a matrix A
 7 */
 8
 9#include<stdio.h>
10#include<math.h>
11
12int main()
13{
14	int i,j;		//counters
15	int columns,rows;	//columns and rows of A
16	double value;		//value of A(i,j)
17	double sum=0;		//sum of the squares
18	double norm;		//just what it looks like
19	
20	printf("This program will find the Euclidian Norm of a matrix you specify.\n");
21	printf("How many rows are in the matrix? ");
22	scanf("%i",&rows);
23	printf("How many columns? ");
24	scanf("%i",&columns);
25
26	//time to input A - we don't need to bother remembering the values, though
27	for(i=1;i<=rows;i++)
28	{
29		for(j=1;j<=columns;j++)
30		{
31			printf("What is the value at %i,%i? ",i,j);
32			scanf("%lf",&value);
33			sum+=value*value;	//adding the square of the value
34						//to the total sum
35		}
36	}
37	//now we have the sum of all the squares
38	
39	norm=sqrt(sum);		//duh
40
41	printf("The euclidian norm of your matrix is: %lf\n",norm);
42	
43	return 0;
44}