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Re: Merging Bytarr [message #23317 is a reply to message #23311]

Wed, 17 January 2001 07:03

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

Hi Mark--

"Mark Chan" <chanm@cadvision.com> writes:
> Thanks Craig.
>
> I used this clumsy way:
> d=bytarr(3,40,700)
> d(0,0,0)=a & d(0,0,200)=b & d(0,0,300)=c
>
> You way is better.

Actually, your way is *faster*, and with the use of TEMPORARY can
potentially use less memory. However the disadvantage is that you
have to know ahead of time the dimensions of your array. I definitely
use above technique alot. The technique I suggested,
[[[a]],[[b]],[[c]]], is very elegant syntactically, and works with any
3x40xN arrays. Since you are a relative newcomer to the group
(right?), I went with simple over efficient.

> What throws me off in the first place was that the image, when shown on
> screen, was 40 wide and 100 high, the next one 200 high, and the last one
> 400 high. To be pasted into 40 wide x 700 wide. The sequence of the
> (3,40,etc) was not the same as my experience with other array indices (may
> be I am missing something).

I am assuming the "3" in 3x40xN are the three elements of an RGB
triple? In that case, you really have a 40xN image, where 40 will be
along the X axis and N will be along the Y axis. I *think* so at
least. So this seems to jive with what you were describing. You can
always use the TRANSPOSE function to flip X and Y.

Craig

--
------------------------------------------------------------ --------------
Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		Re: Merging Bytarr By: Stein Vidar Hagfors H[1] on Wed, 17 January 2001 09:01
		Re: Merging Bytarr By: Craig Markwardt on Wed, 17 January 2001 07:03
		Re: Merging Bytarr By: Mark Chan on Tue, 16 January 2001 20:19
		Re: Merging Bytarr By: Pavel A. Romashkin on Tue, 16 January 2001 10:52
		Re: Merging Bytarr By: Craig Markwardt on Mon, 15 January 2001 22:23

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