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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
The time when I am satisfied with my own solution ;)
It's mathematical notation lingo. That's how you refer to matrix indexes.
Are you referring to the variable names I gave in the ‘for’ loops?
You can change them to ‘x’ and ‘y’ if that makes more sense to you.
Or did I miss something in your question... ?
Why use i and j when plotting an x/y coordinate in a 2D grid?