comp.lang.idl-pvwave archive: archive » Adding x,y events to a 2d array (quickly)

Home » Public Forums » archive » Adding x,y events to a 2d array (quickly)

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

Adding x,y events to a 2d array (quickly) [message #86425]

Thu, 07 November 2013 04:45

oliver[1]
Messages: 3
Registered: November 2013

Junior Member

Hi

This may be a much answered question, but searching for an answer has failed me.

I have 3 (very large) arrays giving x values, y values and energy values.

I wish to create two 2d arrays - one of total (summed) energy for a particular x,y value, and one of total counts per x,y value.

An example of what I tried is below:

x=[1,1,2]
y=[1,1,2]
e=[10,10,10]

To create the 'counts' value, i used the following:

counts=fltarr(5,5)

counts(x,y)++

This works. You end up with a value of 2 at position(1,1) and a value of 1 at position (2,2).

I hoped to get the 'total energy' value by doing the following:

totalenergy=fltarr(5,5)

totalenergy(x,y)+=e

However, this does not work. The final array only contains the last energy value added at each point.

Is there an IDL trick I'm missing that allows you to incrementally add values to an array quickly?

Thanks

Oliver

Report message to a moderator

[Message index]

		Adding x,y events to a 2d array (quickly) By: oliver[1] on Thu, 07 November 2013 04:45
		Re: Adding x,y events to a 2d array (quickly) By: Russell Ryan on Thu, 07 November 2013 06:10
		Re: Adding x,y events to a 2d array (quickly) By: Dick Jackson on Thu, 07 November 2013 11:27
		Re: Adding x,y events to a 2d array (quickly) By: Phillip Bitzer on Thu, 07 November 2013 12:16
		Re: Adding x,y events to a 2d array (quickly) By: Dick Jackson on Thu, 07 November 2013 14:20
		Re: Adding x,y events to a 2d array (quickly) By: Michael Galloy on Thu, 07 November 2013 15:18
		Re: Adding x,y events to a 2d array (quickly) By: Dick Jackson on Fri, 08 November 2013 00:22
		Re: Adding x,y events to a 2d array (quickly) By: oliver[1] on Fri, 08 November 2013 01:19
		Re: Adding x,y events to a 2d array (quickly) By: oliver[1] on Fri, 08 November 2013 06:18
		Re: Adding x,y events to a 2d array (quickly) By: Dick Jackson on Fri, 08 November 2013 08:11

Previous Topic:	Re: Non-blocking socket
Next Topic:	strange !P.multi[0] behavior??

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 13:39:41 PDT 2025

Total time taken to generate the page: 0.00477 seconds