Next: grid rotation
 

What would be your Pythonic solution for rotating a 3x3 grid counterclockwise by 90 degrees?

from a strictly code based solution I'd do something like

I dunno about a more programatic solution though.

-MBirchmeier

I know this isn't the Pythonic answer you're looking for, but it's an improvement:

Pythonic? That would be a simple implementation of an inverse function, using list comprehensions. We will need to count down from the max value, since Python counts backwards (if we are considering the cartegean plane).


Where w is the width, h is the height, and l = w-1 (defined for efficiency purposes).

I think the idea is to create a new grid (or modify the original grid), rather than just print the values; this is a little harder. But I may be mistaken.

Err... am I missing something? @_@ ...

Chapter 1 of the Python tutorial?? You can replace "print" with "grid =" ... :confused: ...


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(Assignment takes place after calculation. It doesn't keep assigning as it's going, so you don't need to worry about that. ;))

Oh, sorry, missed that. :(

In that case, that's probably the best way to do it. It's simple, concise, and easy to read. Although I wouldn't define a separate variable for w-1, but that's just my preference.

Well, it's usually a poor choice to blatantly disregard simple optimization... especially when all it calls for is swapping a calculation for a variable. :confused:

I know it barely makes any difference at all, but it would if say, w-1, was instead a function call. I realise in that case, you would have done it differently, but it's always best to be consistent with your style and make good habits.

Although I am being hypocritical, since, in respect to commenting ... I would never be consistent and comment every single program I make. ;)

I would use matrix math and apply a transformation matrix to it.

Why? Example?