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Re: Speed-up of code [message #67861 is a reply to message #67860]

Tue, 25 August 2009 08:36

wlandsman
Messages: 743
Registered: June 2000

Senior Member

On Aug 25, 10:16 am, Philip Elson <philipel...@googlemail.com> wrote:

> My assumption is that the HISTOGRAM function will be helpful, but
> having spent quite some time on this I am beginning to think that it
> cannot be done - though I would love to be proved wrong by any
> histogram guru out there.

I think you want to read the "drizzling" article on David's Web page
(http://www.dfanning.com/code_tips/drizzling.html ). (Your question
differs only in that in you want to average the values rather than sum
them).

I think "Histogram plus cumulative total" usually had the winning
time:

h = HISTOGRAM(day, REVERSE_INDICES=ri)
nh = N_ELEMENTS(h)
sortData = value[ri[nh+1:*]]
totSortData = [0., TOTAL(sortData, /CUMULATIVE)]
vec8 = totSortData[ri[1:nh]-nh-1] - $
totSortData[ri[0:nh-1]-nh-1]
print,vec8/h ;May need to check for zero values first

--Wayne

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[Message index]

		Re: Speed-up of code By: JDS on Tue, 25 August 2009 15:30
		Re: Speed-up of code By: philipelson on Tue, 25 August 2009 09:18
		Re: Speed-up of code By: philipelson on Tue, 25 August 2009 09:14
		Re: Speed-up of code By: philipelson on Tue, 25 August 2009 09:12
		Re: Speed-up of code By: Craig Markwardt on Tue, 25 August 2009 08:42
		Re: Speed-up of code By: wlandsman on Tue, 25 August 2009 08:36
		Re: Speed-up of code By: David Fanning on Tue, 25 August 2009 08:01

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