Re: Histogram questions - transparent fill? bar distance?

Hi Arindam,

Thank you for the files you sent me! Thank you very much!

Regards,

Michel

> hi Michel,
> I'm attaching a function bar.ncl using which you can overlap two bars
> (setting barGap a negative value). See inside the function for further
> documentation. Not all the features are described although. I'm sure, many
> improvements and changes can be made (and fix possible bugs) to this
> function.
> This function and Mary's suggestions together might solve your problem. A
> sample file (bartest.ncl) is also attached documenting the use of this
> function.
>
> regards,
>
> arindam
>
> --
> ARINDAM CHAKRABORTY
>
>
> ---------- Original Message -----------
> From: Mary Haley <haley_at_ucar.edu>
> To: Michel dos Santos Mesquita <michel_at_iarc.uaf.edu>
> Cc: ncl-talk_at_ucar.edu
> Sent: Tue, 20 Jan 2009 09:05:13 -0700 (MST)
> Subject: Re: Histogram questions - transparent fill? bar
> distance?
>
>> On Sun, 18 Jan 2009, Michel dos Santos Mesquita wrote:
>>
>> > Hi everyone,
>> >
>> > I am creating two histograms plotted in the same figure in NCL (using
>> two
>> > dataset values per bin in the histogram) - like this NCL example:
>> > www.ncl.ucar.edu/Applications/Images/histo_6_lg.png
>> >
>> > I have two questions about that:
>> >
>> > 1) Is there a way for me to change the distance between the two column
>> > bars (in each bin)? - that is, instead of plotting one behind the
>> other, I
>> > would like to plot them one next to the other.
>>
>> Hi Michel,
>>
>> The histogram plots have very limited capability, and there's no way
>> to do this with two plots that are being compared. However, see
>> my answer to #2.
>>
>> > 2) I have attached a figure which was created in another program. I
>> would
>> > like to reproduce that figure in NCL. Two histograms shown in the same
>> > plot: one in the background in gray color. The other in the foreground
>> > using transparent fill. Is that possible in NCL? How?
>>
>> First, NCL cannot do transparent color, although this is something
>> we're working on.
>>
>> To do the kind of plot you want, I would call gsn_histogram twice,
>> drawing each plot on the same page. To do this, you have to be
>> careful that both plots use the same bin intervals, and have the
>> same Y axis limits. Here's a sample script that should
>> run as is:
>>
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
>>
>> ; Generate some random data.
>>
>> z1 = random_uniform(0,320.,500)
>> z2 = random_uniform(0,320.,700)
>>
>> ; Open workstation
>> wks = gsn_open_wks("x11","histo")
>>
>> ; Plot mods
>> res = True
>> res_at_gsnFrame = False ; Don't advance frame
>>
>> res_at_trYMinF = 0. ; Control limits for Y axis
>> res_at_trYMaxF = 110.
>>
>> res_at_gsnHistogramBinIntervals = ispan(0,320,40) ; self
>> explanatory
>>
>> res_at_gsnHistogramBarWidthPercent = 100. ; Bars will be touching
>> res_at_gsFillColor = "gray"
>>
>> plot = gsn_histogram(wks,z1,res)
>>
>> res_at_gsFillColor = "transparent"
>>
>> plot = gsn_histogram(wks,z2,res)
>>
>> plot = gsn_histogram(wks,z2,res)
>> frame(wks)
>> end
>>
>> --Mary
>>
>> > I thank you in advance!
>> >
>> > Regards,
>> >
>> > Michel
>> > --
>> > Michel Mesquita
>> > PhD Student
>> > UAF/IARC
>> > michel_at_iarc.uaf.edu
>> >
>> >
>> > -----------------------------------------
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> ------- End of Original Message -------
>
>
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>

-- 
Michel Mesquita
PhD Student
UAF/IARC
michel_at_iarc.uaf.edu
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