What's goig on here?

You sould return an empty array inside an array.

The answer should be an array with an empty array on it for the empty matrix

An array with an empty array is perfectly reasanoble to be able to represent the state of a matrix with rows and columns

A matrix is a rectangular array of numbers represented in this case with two arrays since ruby doesn't support the a "matrix" type natively

Matrix are conposed by two elements rows and columns

Nope, don't worry about weird cases, but [[]] it's the empy nxn though.

Hey,

It's not an issue, it's a feature :D.

That's the way it suppose to be, look at the image http://www.haan.lu/files/2513/8347/2456/snail.png , it suppose to follow an "snail" pattern, after 21, it goes up with the 16, and continues up with 11 and 6, then continue to the right, util it reaches 9.

Hope it helps.

I'm glad you had so much fun!!

Done!

I think it's really easy on ruby, I think you should disable permutation method.

I just got this error

java.io.FileNotFoundException: Could not locate double_integer__init.class or double_integer.clj on classpath: , compiling:(double_integer_test.clj:1:1

Could somebody help me?

There have been already a discussion about that, it's a good point, however [] is not eather a 0x0 matrix, it's just an empty array, so I think, for this exersice, we could think the [[]] as an 0x0 matrix. I hove you enjoy solving this kata.

Sorry but I got to ask, What are you doing there?

hahaha, rewrite it!