Hi, everyone. I need to find matrix n*n (or 5*5) determinant. I have a function translated from Pascal, but there's INDEX OUT OF RANGE EXCEPTION. Could somebody help me?
Here's my code:

``````public static double DET(double[,] a, int n)
{
int i, j, k;
double det = 0;
for (i = 0; i < n - 1; i++)
{
for (j = i + 1; j < n + 1; j++)
{
det = a[j, i] / a[i, i];
for (k = i; k < n; j++)
a[j, k] = a[j, k] - det * a[i, k]; // Here's exception
}
}
det = 1;
for (i = 0; i < n; i++)
det = det * a[i, i];
return det;
}``````

Thanx for any help.

Line 10 you increment j instead of k. You'll also probably have an issue with line 7 since you allow j to go to n, which is outside the array bounds.

Line 10 you increment j instead of k. You'll also probably have an issue with line 7 since you allow j to go to n, which is outside the array bounds.

Oh, exactly! Thanx, but there's still ecxeption.

Did you change line 7 to `j < n` rather than `j < n + 1` ?

Did you change line 7 to `j < n` rather than `j < n + 1` ?

Oh, thanx. But it doesn't help...

Exception still in the same line? Could you post the current version of your code?

Exception still in the same line? Could you post the current version of your code?

Yes, exception is always in this line.
Current code:

``````public static double DET(double[,] a, int n)
{
int i, j, k;
double det = 0;
for (i = 0; i < n - 1; i++)
{
for (j = i + 1; j < n; j++)
{
det = a[j, i] / a[i, i];
for (k = i; k < n; k++)
a[j, k] = a[j, k] - det * a[i, k]; // HERE
}
}
det = 1;
for (i = 0; i < n; i++)
det = det * a[i, i];
return det;
}``````

I've tried to get it to generate an exception in that line and can't do it. What input are you using?

commented: Guidance of a real pro! +8

I've tried to get it to generate an exception in that line and can't do it. What input are you using?

Oh, thanx a lot! I'm so so inconsiderate! I'd wrong input. It works now!