modify concept exercise exercism-matrix

[depial]

This modifies the concept exercise old-exercism-matrix to better align with about.md for the Concept multi-dimensional-arrays. Some notes:

• The two matrix rotation tasks were removed.
• Two new tasks were included: colpixelcount() and render().
• These last two tasks are more general and move away from exclusively using the Exercism logo matrix.
• Use of parts of most of the sections from introduction.md is possible/encouraged, with the exception of Generating evenly-spaced values.
• Status is set to "wip".
• The old UUID is being used.

During review, special attention should be given to instructions.md and hints.md to check for clarity. Testing should be sufficient, but any suggestions for added tests is welcomed.

[colinleach]

Excellent news! I had no idea where to go with this, so I am (obviously!) delighted to see you rescue the situation.

First impressions positive, but I think it would be worth going through it in more detail tomorrow. It's not late in the day here, but my head feels like it far post-peak.

[depial]

I think it would be worth going through it in more detail tomorrow.

Absolutely! Cast a critical eye on it tomorrow (or later) and also let me know if you think the two added tasks combine with the rest of the exercise plus the flow in general. Since this is a first iteration (which can tend to feel a bit forced), I wouldn't mind iterating again.

[colinleach]

Looks good! I haven't found anything to comment on.

[colinleach]

I got to it in the end, after a chaotic morning (emergency trip to the window blind store after one fell apart on me; neighbor panicking about a flat battery as she's trying to leave for a medical appointment, etc...)

[depial]

Cheers! I'm glad it looks like everything is under control there :)

Looks like everything is working on the website.

I noticed that vector-operations is a leaf in the tree, but seems like it might be a prereq for this. What do you think?

[colinleach]

I noticed that vector-operations is a leaf in the tree

It shouldn't be! I just confirmed in the config.json that the dependencies go vector-operations -> functions -> function-composition -> multi-dimensional-arrays.

For display on the website, I think Jeremy wrote Ruby code to unclutter the tree, hiding some of the more distant prereqs. It still enforces them, though.

[depial]

Good to know! I was thinking it was starting to look a bit cluttered already... Imagine without that Ruby code :D