comp.lang.idl-pvwave archive
Messages from Usenet group comp.lang.idl-pvwave, compiled by Paulo Penteado
Home » Public Forums » archive » Re: Very slow IDL vs Matlab (ascii file reading)
Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend  		Return to the default flat view Create a new topic Submit Reply
Re: Very slow IDL vs Matlab (ascii file reading) [message #36896 is a reply to message #36893] Tue, 04 November 2003 14:56 Go to previous messageGo to previous message
R.G. Stockwell is currently offline  R.G. Stockwell
Messages: 363
Registered: July 1999
Senior Member
"Marcin Jakubowski" <ma.jakubowski@fz-juelich.de> wrote in message
news:bo93p8$1a19g3$1@ID-112500.news.uni-berlin.de...
> Hi all,
> I've tried to read an ASCII file, which is composed of one very long row
> (660*496) double precision numbers,and it takes about one second to read
the file. If I try to do similar
> in IDL 6.0
>
> =============================================
> data = FltArr(660, 496)
> OpenR, lun, 'Mydata.dat', /Get_Lun
> ReadF, lun, data
> Free_Lun, lun
> =============================================
>
> then it takes about 20 minutes (!!!) to read the same file.



I suggest directly typing in the 660 by 496 array, that might be faster than
the 20 minutes.

The above took 1.8 seconds (and that is with casting the doubles into the
float array).
Perhaps your problem is elsewhere?


cheers,
bob

Report message to a moderator

[Message index]
 
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Previous Topic: Re: How to solve a homogeneous system(Ax=0) with a gauss elimination method that x is not zero.
Next Topic: Simple seismic ray tracing code?

-=] Back to Top [=-
[ Syndicate this forum (XML) ] [ RSS ] [ PDF ]

Current Time: Wed Oct 08 19:59:19 PDT 2025

Total time taken to generate the page: 0.00389 seconds
.:: Contact :: Home ::.

Powered by: FUDforum 3.0.7.
Copyright ©2001-2013 FUDforum Bulletin Board Software