comp.lang.idl-pvwave archive: archive

Home » Public Forums » archive » Re: FOR statement

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: FOR statement [message #24744 is a reply to message #24722]

Thu, 12 April 2001 14:04

Liam E. Gumley
Messages: 378
Registered: January 2000

Senior Member

Eli Beckerman wrote:
> In defense of myself, I wasn't using the FOR loop to make an array
> (I just excluded all the unnecessary stuff from my posting, and
> seemingly confused everyone even further!)
>
> But clearly, I was mixing the semantics of indexing with assignment
> as Craig pointed out!
>
> FOR i=0, 999 do radius(i) = i * 0.25 is the way to go for what I
> wanted. Thanks for seeing through my morning foggyness.

Eli,

No matter how look at it, your example shows you *are* using a loop to
create an evenly spaced mesh vector. I guess I was trying to say that
using a loop is not the best way to do this in IDL. One of the wisest
pieces of advice I ever received about IDL programming was

"Try to think like an IDL programmer, not a Fortran or C programmer".

In this spirit, I submit that the following method is preferable:

nx = 1000 ; number of values required
dx = 0.25 ; step size
x1 = 0.0 ; start value
radius = lindgen(nx) * dx + x1

You might try changing the number of values to 10,000,000 and seeing
which method is faster.

Cheers,
Liam.

Report message to a moderator

[Message index]

		Re: FOR statement By: Eli Beckerman on Fri, 13 April 2001 13:17
		Re: FOR statement By: Liam E. Gumley on Thu, 12 April 2001 14:04
		Re: FOR statement By: Eli Beckerman on Thu, 12 April 2001 12:41
		Re: FOR statement By: Craig Markwardt on Thu, 12 April 2001 09:18
		Re: FOR statement By: Liam E. Gumley on Thu, 12 April 2001 09:15
		Re: FOR statement By: Liam E. Gumley on Thu, 12 April 2001 09:12
		Re: FOR statement By: Paul van Delst on Thu, 12 April 2001 08:57
		Re: FOR statement By: John-David T. Smith on Thu, 12 April 2001 09:04

Previous Topic:	Re: MAKE_ARRAY question
Next Topic:	IDLgrWindow, Map_Patch, and contours

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Oct 10 20:02:52 PDT 2025

Total time taken to generate the page: 0.64424 seconds