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Re: I need a bit of help....Convol and functions [message #50395 is a reply to message #50394]

Tue, 03 October 2006 13:42

D.Kochman@gmail.com is currently offline

D.Kochman@gmail.com
Messages: 7
Registered: October 2006

Junior Member

Hey you guys, once again thanks for the help. I'm still having fun
learning IDL. ;)

So heres my next problem is finding out how this was implemented so I
can replicate the procedure in order to do my own convolution. Pretty
much what this following function is is a multiple convolution. It
inputs a system response file (confun) which is 1024 data points.

FUNCTION func, P, X=x, Y=y, ERR=err, CONFUN=confun, $
funcvals=f,binsizefactor=bsf

fshift=floor(-P(4)/bsf)
rshift=-P(4)/bsf-fshift
fconfun=shift(confun,-fshift)
sconfun=(1-rshift)*fconfun+rshift*SHIFT(fconfun,-1)
sumex=P(0)*exp( -X / P(1) )+P(2)*exp( -X / P(3) )+P(7)*exp( -X / P(8) )
blank=dblarr(1024)
consum = convol([blank,sumex],sconfun,total(sconfun),CENTER=0)
consumex=consum[1024:*]
scatter= P(6)*sconfun
f=P(5)+consumex+scatter
err=sqrt(f)
return,(y-f)/(err)
end

So my big question is what is going on in convol? If I'm guessing
correctly it seems like this is creating an array [blank,sumex] in
essence to force an array upon sumex - but its a function. Are
specific data points being used in sumex (ie x=0->1024)? I thought
convol only took two parameters, which would mean sconfun would be the
kernel, but I can't see that thats an array either? What is then the
purpose of total(sconfun)?

I've managed to figure out just about everything else in this program
from the creation of the datastructures, and the widgets and so on.
That stuff is easy - and easily changable. I'm kind of lost with this
one.

-Dave

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[Message index]

		Re: I need a bit of help....Convol and functions By: James Kuyper on Tue, 03 October 2006 16:17
		Re: I need a bit of help....Convol and functions By: news.qwest.net on Tue, 03 October 2006 16:04
		Re: I need a bit of help....Convol and functions By: D.Kochman@gmail.com on Tue, 03 October 2006 13:42
		Re: I need a bit of help....Convol and functions By: JD Smith on Mon, 02 October 2006 14:59
		Re: I need a bit of help....Convol and functions By: James Kuyper on Mon, 02 October 2006 13:00
		Re: I need a bit of help....Convol and functions By: D.Kochman@gmail.com on Mon, 02 October 2006 11:36
		Re: I need a bit of help....Convol and functions By: JD Smith on Mon, 02 October 2006 10:14
		Re: I need a bit of help....Convol and functions By: James Kuyper on Mon, 02 October 2006 07:58
		Re: I need a bit of help....Convol and functions By: D.Kochman@gmail.com on Wed, 04 October 2006 05:59

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