Author Topic: Rotation of a 3x3 matrix (Read 1902 times)

Radical Pi · « **on:** December 24, 2007, 11:25:00 am »

So, I need to be able to do this for a certain *project* I'm working on. I didn't want to have to resort to a For() loop and manually store all coordinates into a temporary second matrix before overwriting the first one.
Is there any magical identity matrix that can do this? Or will I have to do it the boring way?

Just for clarification, I want:
c1-->

CODE

ec1[A B C]
[D E F]
[G H I]c2

ec2
to become:
c1

-->

CODE

ec1[G D A]
[H E B]
[I F C]
or
[C F I]
[B E H]
[A D G]c2

ec2

I'm doubting more and more that there's an efficient way of doing that, but if there is I can't seem to find it myself

vuurrobin · « **Reply #1 on:** December 24, 2007, 12:17:00 pm »

I think that rowswap([A],1,3)t would do the trick. the t is that superscript t for transpose

Radical Pi · « **Reply #2 on:** December 24, 2007, 12:31:00 pm »

That works perfectly

Thanks, I'll have to remember to mention you in the credits.

burr · « **Reply #3 on:** December 24, 2007, 09:06:00 pm »

If you need some help remembering the matrix commands, we have a page for that on TI|BD: http://tibasicdev.wikidot.com/matrices.

Author Topic: Rotation of a 3x3 matrix (Read 1902 times)

Radical Pi

Rotation of a 3x3 matrix

vuurrobin

Rotation of a 3x3 matrix

Radical Pi

Rotation of a 3x3 matrix

burr

Rotation of a 3x3 matrix