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Re: ROTATE function [message #84335 is a reply to message #84333]

Mon, 13 May 2013 08:26

greg.addr
Messages: 160
Registered: May 2007

Senior Member

> It's what happens when software is written years before 24-bit "color
> images" are even a twinkle in the author's eye. :-)

Ok, that makes sense. If you take the longer route using the multi-dimension capable transpose and reverse on a [3,x,y] colour image,

b=transpose(a,[0,2,1]) ;leave zeroth as is; swap 1st and 2nd dimensions
c=reverse(b,1) ;unflip on 1st dimension to arrive at rotation

you get some weird psychedelic result. Why? Because transpose understands dimensions numbered from zero, but reverse likes them numbered from 1!

So it should be c=reverse(b,2). Peculiar? But it works, and all is well.

greg

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[Message index]

		Re: ROTATE function By: Mark Piper on Mon, 13 May 2013 08:39
		Re: ROTATE function By: David Fanning on Mon, 13 May 2013 08:34
		Re: ROTATE function By: greg.addr on Mon, 13 May 2013 08:26
		Re: ROTATE function By: David Fanning on Mon, 13 May 2013 07:57

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