Thread: Diagonal

So far I have managed to get diagonal of a matrix only like this, but I know there is a much simpler way, help! I a matrix is big this is useless.

Code:

for(a=0;a<3;a++)
		{
	for(b=0;b<3;b++)
	{
		if(a==0 && b==0)
		{
			printf("\n%d", mx[a][b]);
		}
		
		if(a==1 && b==1)
		{
			printf("\n%d", mx[a][b]);
		}
		if(a==2 && b==2)
		{
			printf("\n%d", mx[a][b]);
		}
	}

start by asking yourself what is a diagonal. (look at the math definition)

i know what it is, i just don't know how to print it

from your code... if a==b then you print... you have eliminated the 2 ifs. if you have to print only the components that have the indexes equal try to lose a cycle (a for). you don't need to go through all the comonents of the matrix

sorry for being stupid got it!

Code:

		for(a=0;a<4;a++)
		{
			for(b=0;b<4;b++)
			{
				if(a==b)
				{
					b++;
					printf("\n%d", mx[a][b]);
				}
			}
		}

I want to print upper diagonal, and i managed, but it gives me some stupid number, memory trash or something, dont know why, other than that everything works.

lose the second for along with b and print mx[a][a]