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Re: Strange memory problem (/nozero) weird [message #18408]

Thu, 23 December 1999 00:00

R.G. Stockwell
Messages: 363
Registered: July 1999

Senior Member

Curiouser and curiouser.

On WinNT4.0 WS, running IDL 5.2.1, the
/nozero keyword does not cause the bytarr
function to return garbage. It is still
filled with zeros, HOWEVER it does run faster.
0.34099996sec for nozero=1
to
0.48100007sec for nozero=0

Strange.

;;;;;;;;;;;;; idl code to demonstrate the above

t = systime(1)
temp = bytarr(1000,1000,25,/nozero)+10B
timeelapsed=-t + systime(1)

w = where(temp ne 10b,count)
print,'where ne 10',count
print,'Time elapsed (/nozero):',timeelapsed,'sec'
help,temp

t = systime(1)
temp = bytarr(1000,1000,25)+10B
timeelapsed=-t + systime(1)

w = where(temp ne 10b,count)
print,'where ne 10',count
print,'Time elapsed:',timeelapsed,'sec'
help,temp
end

--
��`��,��,�`��`��, ��,�`
R.G. Stockwell
Colorado Research Associates
3380 Mitchell Lane

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Re: Strange memory problem (/nozero) weird

By: R.G. Stockwell on Thu, 23 December 1999 00:00

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