comp.lang.idl-pvwave archive: archive

Home » Public Forums » archive » histogram question

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

Re: Histogram question [message #40375 is a reply to message #26139]

Sun, 08 August 2004 11:52

mperrin+news
Messages: 81
Registered: May 2001

Member

Michael Wallace <mwallace.no.spam@no.spam.swri.edu.invalid> wrote:
> I wrote this little snippet which doesn't use HIST_2D at all. It's just
> a simple FOR loop and adding values. Back in the good ol' days, I would
> have been satisfied with this, but after having read this newsgroup for
> a while I just have a feeling that there's a way to get rid of that FOR
> loop and do something totally cool with the HISTOGRAM function. So I
> guess my question is more academic than anything else.

It's too bad HIST_2D doesn't have a REVERSE_INDICES keyword like HISTOGRAM
does. If it did, you could do something like

H = hist_2d(v1,v2,reverse_indices=r)
for i=0L,n_elements(h)-1 do
H[i] += total(v3[R[R[I] : R[i+1]-1]] -1 )

You could maybe still make this work if you don't mind unrolling your
2D arrays into 1D arrays somehow. The above code is just off the top
of my head and hasn't been tested or debugged or anything like that,
so no promises are made!

- Marshall

Report message to a moderator

[Message index]

		histogram question By: Gregory Y. Prigozhin on Wed, 08 August 2001 13:17
		Re: histogram question By: Jim Pendleton on Thu, 09 August 2001 15:01
		Re: Histogram question By: Chris Lee on Mon, 09 August 2004 07:39
		Re: Histogram question By: mperrin+news on Sun, 08 August 2004 11:52
		Re: Histogram question By: JD Smith on Tue, 10 August 2004 11:43
		Re: Histogram question By: Michael Wallace on Sun, 08 August 2004 11:28
		Re: Histogram question By: David Fanning on Sun, 08 August 2004 06:40
		Re: Histogram question By: David Fanning on Tue, 10 August 2004 12:26

Previous Topic:	Contour Border Sort Error
Next Topic:	Passing Structures with Pointers with Call_External

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sat Oct 11 14:27:31 PDT 2025

Total time taken to generate the page: 0.16207 seconds