comp.lang.idl-pvwave archive: archive

Home » Public Forums » archive » Re: Faster way ?

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

Re: Faster way ? [message #41173 is a reply to message #41172]

Mon, 27 September 2004 10:44

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

rats@mail.geog.uvic.ca (Rafael Loos) writes:
> Hi, I am trying to find the number of values that are within a range
> ...
> I have an Array that has 3 columns and 5 millions lines.
> Thats what I am doing ...
>
> number = WHERE((Array[1,*] GE Min) AND (Array[1,*] LE Max), geralX)
>
> I am storing the number inside the variable geralX ...
> It is taking 0.23 seconds ... but I want to know if there is a faster
> way to find that ...

If you are doing this many times in a loop and ARRAY is unchanging, it
may be worth extracting ARRAY[1,*] into its own variable. That way,
you will save the time of extracting each iteration.

If you just want the total number of elements that match your filter,
you can use total, as in:

filter = (Array[1,*] GE Min) AND (Array[1,*] LE Max)
geralX = total(filter)

Good luck,
Craig

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

Report message to a moderator

[Message index]

		Re: Faster way ? By: btt on Tue, 28 September 2004 09:05
		Re: Faster way ? By: JD Smith on Tue, 28 September 2004 08:49
		Re: Faster way ? By: btt on Mon, 27 September 2004 14:12
		Re: Faster way ? By: Dick Jackson on Mon, 27 September 2004 13:46
		Re: Faster way ? By: Craig Markwardt on Mon, 27 September 2004 10:44

Previous Topic:	Re: Unique system identified?
Next Topic:	IDL filled contour to PostScript - wired horizontal and vertical lines ???

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Dec 03 14:11:14 PST 2025

Total time taken to generate the page: 1.28015 seconds