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rebin vs congrid [message #89069]

Tue, 22 July 2014 07:12

greg.addr
Messages: 160
Registered: May 2007

Senior Member

The documentation says rebin is somewhat faster than congrid, but it doesn't seem to be true (at least, not for upsizing)...

pro tmp_rebin_vs_congrid
sz=[5000L,5000L]
f=8
a=findgen(sz)
t=tic("rebin")
b=rebin(a,sz[0]*f,sz[1]*f,/sample)
toc,t
t=tic("congrid")
c=congrid(a,sz[0]*f,sz[1]*f)
toc,t
end

IDL> tmp_rebin_vs_congrid
% Time elapsed rebin: 4.6150000 seconds.
% Time elapsed congrid: 1.9849999 seconds.
IDL>

cheers,
Greg

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[Message index]

		rebin vs congrid By: greg.addr on Tue, 22 July 2014 07:12
		rebin vs congrid By: Chip Helms on Thu, 24 July 2014 09:58

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