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Re: Relative distances between vector elements and search for matches in other vector. [message #80021 is a reply to message #80020]

Wed, 25 April 2012 07:40

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Trifon Trifonov writes:

> I want to mention that I already made a working algorithm
> but I am 1000 % sure that the more experienced people
> here can help me to make it much more elegant and efficient.
> Later on I have a other problem on that I stuck but lets
> see can you help me on that and it is possible to solve
> it my self... if not I will post again :(

I have a reading assignment for you. :-)

Are FOR Loops the Embodiment of Pure Evil?
http://www.idlcoyote.com/tips/forloops.html

Are FOR Loops *Really* Evil?
http://www.idlcoyote.com/tips/forloops2.html

I don't have time to look at this in much detail,
except to point out that you have a lot of code
that looks like this:

for j=0L, n_elements(xx)-1 do begin
ratio[j] = xx[0] - xx[j]
endfor

This code can *always* be written (and will work a LOT
faster) if you write it like this:

ratio = xx[0] - xx

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: Relative distances between vector elements and search for matches in other vector. By: Tito on Thu, 26 April 2012 06:48
		Re: Relative distances between vector elements and search for matches in other vector. By: cgguido on Wed, 25 April 2012 08:03
		Re: Relative distances between vector elements and search for matches in other vector. By: cgguido on Wed, 25 April 2012 07:45
		Re: Relative distances between vector elements and search for matches in other vector. By: David Fanning on Wed, 25 April 2012 07:40
		Re: Relative distances between vector elements and search for matches in other vector. By: cgguido on Thu, 26 April 2012 14:30

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