comp.lang.idl-pvwave archive: archive » Re: Using "the IDL way" and it's still not fast enough

Home » Public Forums » archive » Re: Using "the IDL way" and it's still not fast enough

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

Re: Using "the IDL way" and it's still not fast enough [message #83707 is a reply to message #83705]

Wed, 27 March 2013 09:14

MarioIncandenza
Messages: 231
Registered: February 2005

Senior Member

On Wednesday, March 27, 2013 7:42:58 AM UTC-7, KenBowman wrote:
> I don't think so. In IDL the first array index varies fastest (is
> contiguous in memory).

That's correct. Just for posterity, here is the test I did to show just how much faster it is to MIN along the first dimension:

IDL> qq=indgen(3,3,3,3,120e3)
IDL> t0=systime(1) & for i=0,100 do null=min(qq,dim=5) & print,systime(1)-t0
39.741640
IDL> qq2=transpose(qq,[4,0,1,2,3])
IDL> t0=systime(1) & for i=0,100 do null=min(qq2,dim=1) & print,systime(1)-t0
2.0115819

--Edward H.

Report message to a moderator

[Message index]

		Re: Using "the IDL way" and it's still not fast enough By: chris_torrence@NOSPAM on Wed, 27 March 2013 20:40
		Re: Using "the IDL way" and it's still not fast enough By: MarioIncandenza on Wed, 27 March 2013 15:49
		Re: Using "the IDL way" and it's still not fast enough By: MarioIncandenza on Wed, 27 March 2013 12:19
		Re: Using "the IDL way" and it's still not fast enough By: Craig Markwardt on Wed, 27 March 2013 09:56
		Re: Using "the IDL way" and it's still not fast enough By: MarioIncandenza on Wed, 27 March 2013 09:14
		Re: Using "the IDL way" and it's still not fast enough By: Jeremy Bailin on Wed, 27 March 2013 08:14
		Re: Using "the IDL way" and it's still not fast enough By: Kenneth Bowman on Wed, 27 March 2013 07:42
		Re: Using "the IDL way" and it's still not fast enough By: lecacheux.alain on Wed, 27 March 2013 07:15
		Re: Using "the IDL way" and it's still not fast enough By: Brian Daniel on Wed, 27 March 2013 06:52

Previous Topic:	Re: volume() command
Next Topic:	Regression fit and random noise

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Oct 10 04:29:34 PDT 2025

Total time taken to generate the page: 0.95745 seconds