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Re: Slow array indexing [message #29215 is a reply to message #29214]

Wed, 06 February 2002 09:15

the_cacc
Messages: 104
Registered: October 2001

Senior Member

Only seems to apply to BYTARR, INTARR and UINDGEN. The program below
gives the following output on IDL5.5 Aplha Linux:

IDL> test
% Compiled module: TEST.
{ alpha linux unix linux 5.5 Aug 28 2001 64 64}
1 3.2928760
2 2.3732140
3 0.047249913
4 0.047480941
5 0.0059390068
6 0.0069260597
9 0.0088199377
12 2.3164300
13 0.0047600269
14 0.0057559013
15 0.0054670572

------------------------------------
PRO test

n = 256
index = lindgen(n)
type = [1,2,3,4,5,6,9,12,13,14,15]

print,!version

FOR i = 0,10 DO BEGIN
arr = MAKE_ARRAY(n,n,TYPE=type[i])
t=systime(1)
temp=arr[*,index]
print,type[i],systime(1)-t
ENDFOR

END
-------------------------------------

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[Message index]

		Re: Slow array indexing By: Nigel Wade on Thu, 07 February 2002 10:09
		Re: Slow array indexing By: the_cacc on Thu, 07 February 2002 09:17
		Re: Slow array indexing By: the_cacc on Thu, 07 February 2002 02:21
		Re: Slow array indexing By: Nigel Wade on Thu, 07 February 2002 01:45
		Re: Slow array indexing By: Nigel Wade on Wed, 06 February 2002 09:26
		Re: Slow array indexing By: the_cacc on Wed, 06 February 2002 09:15

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