[ncl-talk] Histogram using "gsn_csm_xy" res at gsnXYBarChartOutlineOnly = True

[Mary Haley]

This is the correct behavior.

Please read the documentation for gsnXYBarChart and
gsnXYBarChartOutlineOnly at:

http://www.ncl.ucar.edu/Document/Graphics/Interfaces/gsn_csm_xy.shtml

   - *gsnXYBarChart*
   <http://www.ncl.ucar.edu/Document/Graphics/Resources/gsn.shtml#gsnXYBarChart>
   - if set to True, then instead of a curve, a bar will be drawn for each Y
   value. Each bar will be centered around its X location.

   - *gsnXYBarChartOutlineOnly*
   <http://www.ncl.ucar.edu/Document/Graphics/Resources/gsn.shtml#gsnXYBarChartOutlineOnly>
   - if set to True, then instead of a curve, you will get a box outline of
   your curve. This resource is different than the behavior of
   *gsnXYBarChart*
   <http://www.ncl.ucar.edu/Document/Graphics/Resources/gsn.shtml#gsnXYBarChart>,
   because the vertical lines represent the exact location of the X values,
   and not centered about the X values.

--Mary


On Sun, Feb 8, 2015 at 1:48 PM, Joowan Kim <joowan at ucar.edu> wrote:

> Dear NCL experts
>
> I'm drawing histogram using, gsn_csm_xy.
> It is very useful for me as it support drawing only outline of the
> histogram, res at gsnXYBarChartOutlineOnly = True
>
> But I found this option shifts the histogram half of dx (bin size).
> Is it only my problem or designed like that on purpose?
> I'm using ncl v6.2.0 in MacOS.
>
> please see my testing example below
> Any comment will be helpful for me!
>
> Thanks
>
> ----------------------------
> s = random_normal(0,3,2000)
> r = True
> r at bin_max =  5.
> r at bin_min = -5.
> y = pdfx(s,10,r)
> x = y at bin_center
>
> w = gsn_open_wks("eps","bar2")
> o = True
> o at gsnDraw  = False
> o at gsnFrame = False
> o at gsnXYBarChart = True
> p1 = gsn_csm_xy(w,x,y,o)
> o at gsnXYBarChartOutlineOnly = True
> o at xyLineColor = "red"
> p2 = gsn_csm_xy(w,x,y,o)
> overlay(p1,p2)
> draw(p1)
> frame(w)
>
> print("CAUTION: gsnXYBarChartOutlineOnly = True shifts the histogram...")
> ----------------------------
>
>
> --
> Joowan Kim
> Atmospheric Chemistry Division
> National Center for Atmospheric Research
> PO Box 3000  Boulder, CO 80307
> e-mail : joowan at ucar.edu
>            joowan.k at gmail.com
>
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