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Re: Log histogram = FAIL [message #72048 is a reply to message #71962]

Tue, 03 August 2010 11:17

chris_torrence@NOSPAM is currently offline

chris_torrence@NOSPAM
Messages: 528
Registered: March 2007

Senior Member

On Aug 2, 12:17 pm, Haje Korth <hajeko...@gmail.com> wrote:
> Plotting log histograms using new graphics system in IDL does not work
> right. Try
>
> IDL> a=findgen(10)+1
> IDL> b=10./a^2
> IDL> b[8]=0
> IDL> p=plot(a,b,/histogram,/ylog,yrange=[1.0d-3,10])
>
> Then tell me what happened to the last data point. I understand that 0
> is an illegal log value, but IDL should be smart enough to filter
> this. BTW, this works fine in direct graphics.
>
> Haje

Hi Haje,

The log plot seems to work correctly without the histogram keyword:

p=plot(a,b,'-o',/ylog,yrange=[1.0d-3,10])

We didn't document the histogram keyword, because we wanted people to
start using barplot() instead. Unfortunately, for IDL 8.0, BARPLOT
doesn't handle logarithmic axes. However, I have just fixed the
barplot code, and it will be available in the next IDL update.

Cheers,
Chris Torrence
IDL Software Development Manager
ITTVIS

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[Message index]

		Log histogram = FAIL By: Haje Korth on Mon, 02 August 2010 11:17
		Re: Log histogram = FAIL By: Haje Korth on Tue, 03 August 2010 12:24
		Re: Log histogram = FAIL By: chris_torrence@NOSPAM on Tue, 03 August 2010 11:17

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