IndexOutOfRangeException when Using loop to create jagged array

Question

when trying to use a loop to create a jagged array, but what happens is I get an IndexOutOfRangeException when i and j are 0. Here is the code

        double[,][] coords = new double[,][] { };
        for (int i = 0; i <= p; i++)
        {
            for (int j = 0; j <= q; j++)
            {
                coords[i, j] = new double[4] { (4 things in here) };
            }
        }

I have read this: http://www.daniweb.com/software-development/java/threads/360615 but do not know how to apply it to this.

Solution: changed from "double[,][] coords = new double[,][] { };" to "double[,][] coords = new double[p,q][];" Thanks!

What are you trying to achieve? How are p and q initialized? — Bernard
– Bernard, Commented Dec 22, 2011 at 1:22

Tomislav Markovski · Accepted Answer · 2011-12-22 01:28:12Z

3

You need to instantiate your array size, from your code I assume this would be correct size.

double[,][] coords = new double[p+1,q+1][];

answered Dec 22, 2011 at 1:28

Tomislav Markovski

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2 Comments

shenhengbin Over a year ago

+1 , and also he need change the i < = p and j < =q to i < p and j < q ?

Tomislav Markovski Over a year ago

I can't tell if he needs that, he should know, but if he does, array size will be just [p,q]

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