[ncl-talk] How to create two y axis with a common x axis in bar plot

[Mary Haley]

Ipsita,

In order to overlay a bunch of bar charts, it works best if you can shift
each of the bars by a certain bar width, and then you can draw them
side-by-side.  I think you may have used part of bar_11.ncl on our bar
examples page, and this is a good one to work with. However, you want to
add some overlay code in there, which will make all the plots part of the
same plot.

The key is to draw each set of bars with a slightly shifted set of X
values, so the bars are drawn next to each other.

See the attached example and script.

--Mary



On Fri, Aug 1, 2014 at 4:27 PM, Ipshita Majhi <ipmajhi at alaska.edu> wrote:

> Hi,
> I want to plot trend values and monthly means in one plot. Both are an
> array of size 12 .
> The program gives no error but the plot are overlapping. I am not sure how
> to fix it. I realized that if I use the below mentioned method they overlap
> is there a way to have two y axis in bar plots. Since the trends are much
> smaller then avgs.
>
> ;*****************************************************
> ;Trend and monthly climatology together in one bar plot
> ;*******************************************************
>
>      load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
>      load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
>
>      months=(/1,2,3,4,5,6,7,8,9,10,11,12/)
>
>
> monthly_avg=asciiread("~/Documents/PhD_June_2015/NCL_Moonsoon/Data_output/Monthly_avg_air.txt",-1,
> "float")
>
> monthly_Trend=asciiread("~/Documents/PhD_June_2015/NCL_Moonsoon/Data_output/trend_air.txt",
> -1, "float")
>      printVarSummary(monthly_avg)
>
>      wks = gsn_open_wks("ps","Trend_Avg")
>
>
>      sres = True
>      sres at vpWidthF = 0.7
>      sres at vpHeightF = 0.5
>      sres at gsnDraw = True
>      sres at gsnFrame = False
>      sres at gsnXYBarChart = True
>      sres at gsnXYBarChartBarWidth = 0.15           ; change bar widths
>      sres at tmXBMode          = "Explicit"         ; explicit labels
>      sres at tmXBValues        = (/1,2,3,4,5,6,7,8,9,10,11,12/)
>      sres at tmXBLabels =
> (/"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"/)
>      sres at tmXBLabelFontHeightF = 0.0205
>      sres at tmXTLabelFontHeightF = 0.0205
>      sres at tmYLLabelFontHeightF = 0.0225
>      sres at tiMainFontHeightF = 0.025
>      sres at tiMainFont = "helvetica"
>      sres at tiMainString = "All India Rainfall Climatology and Trend
> 1880-2012"
>      sres at tiYAxisString = "(mm)"
>
>      plot1 = gsn_csm_xy (wks,months,monthly_avg,sres)
>      sres at gsnXYBarChartColors = (/"red"/)                    ;
> seperately, not
>      plot2 = gsn_csm_xy(wks,months,monthly_Trend,sres)
>                ; advancing the frame
>      sres at gsnXYBarChartColors = (/"blue"/)                    ; but
> tweaking where
>
>
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