From maintainers-request at octave dot org Sat Jan 29 19:52:58 2005
Subject: Re: min function very slow?
From: Daniel J Sebald <daniel dot sebald at ieee dot org>
To: "Dmitri A. Sergatskov" <dmitri at unm dot edu>
Cc: maintainers at octave dot org
Date: Sat, 29 Jan 2005 19:59:22 -0600

Dmitri A. Sergatskov wrote:

>
>
> Daniel J Sebald wrote:
>
>> My eyes are deceiving me.  I came across a slow loop and to my 
>> surprise traced it to the min function.  But I'm wondering how this 
>> can be because I looked through the source code and the min/max 
>> commands inside minmax.cc and dNDArray.cc look identical except 
>> obviously for the change in sign when testing order.  I have a fairly 
>> recent version of 2.1.64.
>>
>> I put together a little test script.  Someone please try the attached 
>> script.  My result is
>>
>> octave:1> minmaxtime
>> looptime = 0.044205
>> maxtime = 0.081752
>> mintime = 7.5832
>>
>> Thank you,
>>
>> Dan
>>
>
> octave:1> minmaxtime
> looptime = 0.035128
> maxtime = 0.065962
> mintime = 0.30040
>
> Regards,
>
> Dmitri
>
> p.s. 2.1.64 + octave-forge-2004.11.16 / athlonMP 2000 MHz


Thank you... so do you think your increase for mintime is a blip in the 
OS?  Yours is a factor of 4.5 difference, mine is a factor of 76.

Dan