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Re: HISTOGRAM data type bug? [message #71347 is a reply to message #71345]

Mon, 14 June 2010 02:45

Foldy Lajos
Messages: 268
Registered: October 2001

Senior Member

On Mon, 14 Jun 2010, chris wrote:

> Hi,
> I observed that IDL 6.4 x64 and 7.1 x64 (Windows 7 x64) crashes each
> time I'd like to do the following:
>
> IDL> test_histo_bug
> % Compiled module: TEST_HISTO_BUG.
> L INT = Array[5, 5]
> L DOUBLE = Array[5, 5]
> H LONG = Array[7]
>
> IDL> test_histo_bug,/crashme
> ->IDL crashes completely
>
>
> pro test_histo_bug,crashme=crashme
> l=$
> [[0,0,0,0,0],$
> [0,1,1,1,1],$
> [0,1,1,1,1],$
> [0,1,1,1,1],$
> [0,1,1,1,2]]
> help,l
> l=keyword_set(crashme)? ulong(l) : double(l)
> h=histogram(l,reverse_indices=r,nbins=7,min=1)
> help,l,h
> end
>
> Is it possible that HISTOGRAMM can't *handle* ULONG values? May be
> someone can shed some light on this behaviour?
>
> Thanks in advance
>
> CR
>

From the docs:
----------
BINSIZE
Set this keyword to the size of the bin to use. If this keyword is not
specified, and NBINS is not set, then a bin size of 1 is used. If NBINS is
set, the default is BINSIZE = (MAX - MIN) / (NBINS - 1).

Note
The data type of the value specified for BINSIZE should match the data
type of the Array argument. Since BINSIZE is converted to the data type of
Array, specifying mismatched data types may produce undesired results.
----------

So, your BINSIZE is 0 (calculated as ULONG). This may cause a 'divide by
zero' crash. I think IDL forgets to check BINSIZE.

regards,
lajos

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[Message index]

		Re: HISTOGRAM data type bug? By: rogass on Tue, 15 June 2010 11:38
		Re: HISTOGRAM data type bug? By: David Fanning on Mon, 14 June 2010 05:36
		Re: HISTOGRAM data type bug? By: rogass on Mon, 14 June 2010 05:29
		Re: HISTOGRAM data type bug? By: Foldy Lajos on Mon, 14 June 2010 02:45
		Re: HISTOGRAM data type bug? By: Timm Weitkamp on Mon, 14 June 2010 01:57

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