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Very strange problem in IDL histogram, A bug??? [message #76678]

Thu, 23 June 2011 10:09

Poonam Chandra
Messages: 12
Registered: June 2011

Junior Member

Hi,
My data distribution looks like this:

Range No.
0-50 0
50-100 8
100-150 14
150-200 18
200-250 8
250-300 8
300-350 5
350-400 2
400-600 17
600-800 4
800-1000 6
1000-2000 2

With the help of Jeremy in a previous discussion, this is how I am
proceeding:

data = [50+randomu(seed,8)*50, 100+randomu(seed,14)*50,
150+randomu(seed,18)*50, $
200+randomu(seed,8)*50, 250+randomu(seed,8)*50, 300+randomu(seed,
5)*50, 350+randomu(seed,2)*50, $ 400+randomu(seed,17)*200,
600+randomu(seed,4)*200, 800+randomu(seed,6)*200, $
1000+randomu(seed,2)*1000]

bin_edges = [0,50,100,150,200,250,300,350,400,600,800,1000,2000]
nbins = n_elements(bin_edges)-1
data_bins = value_locate(bin_edges, data)
labelnums = rebin(1 # bin_edges, 2, nbins+1, /sample)
labels = string(labelnums[1:2*nbins], format='(%"%0d - %0d")')

cghistoplot, data_bins, xrange=[0,nbins], xticks=nbins-1, $
xtickv=0.5+indgen(nbins), xtickname=labels, /window

And in the plot window, this is what the final distribution is
looking:
0-75 0
75-175 22
175-275 26
275-375 13
375-700 2
700-1050 0
1050-2000 2

This is totally crazy. How did the IDL get this distribution for the
histogram?
I backtracked the problem and I see that as long as I define my data
has 7
ranges (i.e. 0-50, 50-100, 100-150, 150-200, 200-250, 250-300,
300-350, 350-400),
everything is fine but the moment I add the next range i.e. 400-600,
it totally goofs up.
Any idea whats going on? Is it any bug in histogram? If I have your
email address, I can actually
send the full program and the final plots for you to have a look at.

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[Message index]

		Very strange problem in IDL histogram, A bug??? By: Poonam Chandra on Thu, 23 June 2011 10:09
		Re: Very strange problem in IDL histogram, A bug??? By: Poonam Chandra on Mon, 27 June 2011 08:18
		Re: Very strange problem in IDL histogram, A bug??? By: Poonam on Sat, 25 June 2011 11:49
		Re: Very strange problem in IDL histogram, A bug??? By: Jeremy Bailin on Fri, 24 June 2011 13:30

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