Re: combined bar plot (distribution diagram)

perfect! thanks Adam, to bring up this issue,
Regards.

On Thu, Jun 5, 2014 at 1:40 AM, Adam Phillips <asphilli@ucar.edu> wrote:

> Hi Erika,
> As a reminder: pdfx is a contributed function, so you can always look at
> the underlying code by examining the contributed file itself:
> $NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl
> If the code doesn't exactly do what you want you can always modify the
> code by copying and renaming a particular function.
>
> You are right, you cannot exactly specify the bin-centers in pdfx.
> However, looking at the coding for pdfx, there's this:
> if (opt .and. isatt(opt,"bin_min")) then
> xMin = opt@bin_min ; user set
> else
> xMin = XMIN ; calculate
> end if
>
> if (opt .and. isatt(opt,"bin_max")) then
> xMax = opt@bin_max ; user set
> else
> xMax = XMAX ; calculate
> end if
>
> ; skip ahead in code
>
> dbin = (xMax-xMin)/nbins
> binBound = xMin + ispan(0,nbins,1)*dbin
> binBound(nbins) = xMax ; avoid
> roundoff
> binCenter = (binBound(0:nbins-1) + binBound(1:nbins))*0.5d
>
> What this shows is that you can indirectly set the bin centers by
> specifying the same
> bin_max, bin_min, and the number of bins. Notice that this will be
> scalable. Setting bin_min to -20 and bin_max to 20 and the number of bins
> to 20 means binCenter will be = ispan(-19,19,2). While setting bin_min to
> -40 and bin_max to 40 and the number of bins to 40 means binCenter will be
> = ispan(-39,39,2).
>
> So you can get the bin centers to be the same. As far as shifting the bars
> in gsn_csm_xy: That's just a matter of shifting the input x-axis array(s)
> in gsn_csm_xy.. In the example I sent yesterday, assuming now that the bin
> centers are all the same you could do this:
>
> width = (xx(0,2) - xx(0,1))/2.5 ; If the bin centers are the same the
> bin widths are the same for all of xx.
> res@gsnXYBarChartBarWidth = width
> plot = gsn_csm_xy (wks, xx(0,:)-(width*1.2), yy(0,:), res)
> plot2 = gsn_csm_xy (wks, xx(1,:), yy(1,:), res)
> plot3 = gsn_csm_xy (wks, xx(2,:)+(width*1.2), yy(2,:), res)
>
> Obviously you might have to adjust the (width*1.2) syntax along with the
> calculation of width for your own needs.
> Hope that helps, and if not, let ncl-talk know..
> Adam
>
>
> On 06/04/2014 09:56 AM, Erika Folova wrote:
>
> Dear NCL,
>
> Adam, thanks,,
> I tried to do it again as your suggestion. The plot is attached,
> I think I still have a problem, as you can see where the bar charts are
> still overlapped, is there any trick
> how to manage this, at least to shift the overlapping bar?
>
> I am really sure, this issue comes from the pdfx function, where the
> "bin centers" are different from these
> 3 distribution, is there any way around how to solve this proble, I just
> want at least get the bar attached one to another.
> Thanks for your help. Regards.
>
>
> On Wed, Jun 4, 2014 at 5:08 AM, Adam Phillips <asphilli@ucar.edu> wrote:
>
>> Hi Erika,
>> There's two things going on here:
>> 1) The bin centers for your three bar charts are all different and each
>> bar chart has different bin sizes. This makes lining them up in a nice
>> fashion nearly impossible.
>> 2) res@gsnXYBarChartColors does not work the way you are trying to use
>> it. It applies the colors set in res@gsnXYBarChartColors sequentially to
>> each bin. Thus, setting res@gsnXYBarChartColors =
>> (/"orange","red","black"/) will set the first bar of your first bar chart
>> orange, the second bar red, the third bar black, the fourth bar orange and
>> so on. It will not set the first bar chart entirely to orange, the second
>> to red, and the third to black.
>>
>> Take a look at example #9 here:
>> http://www.ncl.ucar.edu/Applications/bar.shtml#ex9
>>
>> Note that the input x-axis values differ for each bar chart when each of
>> the four plots is created.
>>
>> Also note that gsn_labelbar_ndc is used to create the labelbar, and
>> that's the way I would recommend creating the legend using this method. I
>> have attached a modified version of your script along with the resulting
>> plot. I did not add coding to put the legend in.
>>
>> Hope that helps. If you have any further questions please reply to
>> ncl-talk.
>> Adam
>>
>>
>> On 06/03/2014 12:41 PM, Erika Folova wrote:
>>
>> Hallo NCL,
>>
>> Lately Im trying to generate a plot by combining three distributions
>> (bar chart) from the output of pdf function.
>> The figure that I want to have is attached (expected_figure.png). I
>> experimented to try it using a simple script provided in
>> example 2, but when i turn on the barchart options it seems like all the
>> bars are overlapped.
>> Is there any nice trick to do this kind of task (output of pdf function)
>> ? I really appreciate for your nice help
>>
>> Best.
>> Erika
>>
>>
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>>
>> --
>> ______________________________________________________________
>> Adam Phillips asphilli@ucar.edu
>> NCAR/Climate and Global Dynamics Division (303) 497-1726
>> P.O. Box 3000
>> Boulder, CO 80307-3000 http://www.cgd.ucar.edu/staff/asphilli
>>
>>
>
> --
> ______________________________________________________________
> Adam Phillips asphilli@ucar.edu
> NCAR/Climate and Global Dynamics Division (303) 497-1726
> P.O. Box 3000
> Boulder, CO 80307-3000 http://www.cgd.ucar.edu/staff/asphilli
>
>

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Received on Wed Jun 04 12:46:05 2014