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Re: speed of n_elements [message #17643]

Thu, 04 November 1999 00:00

R.Bauer
Messages: 1424
Registered: November 1998

Senior Member

Pavel Romashkin wrote:

>> * I can't repeat your experience on Sun or Linux. On both those
>> machines n_elements(data.flag) is much slower than n_elements(data),
>> at least in a loop.
>
> Thank you for the test, Craig. I repeated it and n_elements(data) was way
> faster. But I was certain that I saw what i saw, so I reconstructed the
> entire data system in the same way it was in my program. DATA in my program
> is itself passed as a field of State structure inside a widget tree. Try the
> following code:
> **************
> pro test, a
>
> start=systime(1)
> for i=0, 100 do temp = n_elements(a.data)
> print, systime(1)-start
>
> start=systime(1)
> for i=0, 100 do temp = n_elements(a.data.flag)
> print, systime(1)-start
>
> end

Hi

This example is 100 times faster.

R.Bauer

pro test, a

start=systime(1)
c=a.data ; changed !!
for i=0, 100 do temp = n_elements(c)
print, systime(1)-start

start=systime(1)
for i=0, 100 do temp = n_elements(a.data.flag)
print, systime(1)-start

end

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[Message index]

		Re: speed of n_elements By: R.Bauer on Thu, 04 November 1999 00:00
		Re: speed of n_elements By: Craig Markwardt on Wed, 03 November 1999 00:00
		Re: speed of n_elements By: Pavel Romashkin on Wed, 03 November 1999 00:00
		Re: speed of n_elements By: Craig Markwardt on Wed, 03 November 1999 00:00

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