[ncl-talk] Question about ndtooned and histogram plot

[Dennis Shea]

You can count yourself:

  nRain0    = *num*(rain_region.eq.0)
  nRain     = num(rain_region.gt.0)
  nRainMsg  = num(ismissing(rain_region))

  print("  nRain0="+nRain0)
  print("  nRain ="+nRain )
  print("nRainMsg="+nRainMsg)

  opt = True
  opt at PrintStat = True
  stat_rain_region = *stat_dispersion*(rain_region, opt )
print("===")

  n_1015 = num(rain_region.ge.10 .and. rain_region.lt.15)
  print("n_1015="+n_1015)
print("===")

  test   = *ndtooned*(rain_region)
  iGood  = *ind*(test.gt.0)         ; only grid points > 0.0
  test  *:=* test(iGood)

On Sat, Sep 14, 2019 at 2:51 AM Lyndz via ncl-talk <ncl-talk at ucar.edu>
wrote:

> Dear NCL experts,
>
> *[Details]*
> I  want to plot a histogram with the number of grid points in the y-axis
> and rainfall classification in the x-axis.
> The attached figure is an example of what I wanted (Desired_output.gif).
>
> The data that I am using can be downloaded from this link:
> https://www.dropbox.com/s/lbkjlqgq9era5c7/APHRO_AMJ_1979-2015.nc?dl=0
>
> *[What I have so far]*
> The following is the script that I am using:
>
> ;***********************************************************
> ;This script creates a histogram of the number of gridpoints
> ;with rainfall above 0 mm/day
> ;Created by Lyndz
> ;olagueralyndonmark429 at gmail.com
> ;*******************************************************
> begin
> fo = addfile("APHRO_AMJ_1979-2015.nc","r")
> rain=fo->precip(:,:,:)
> rain_region=rain(:,{12.5:22},{120:122.5})
> *test=ndtooned(rain_region)*
> ;*************************************
> ;Plots histogram
> ;*************************************
>   wks = gsn_open_wks("png","output")             ; send graphics to PNG
> file
>   gsn_define_colormap(wks,"temp1")              ; choose colormap
>   res                                 = True
>   res at gsnHistogramSelectNiceIntervals = False   ; intervals now float
>   res at gsnHistogramComputePercentages  = True    ; change left axis to %
>   res at gsnHistogramClassIntervals = (/0,1,5,10,15,20,25,30,25,40,45/)
>   res at gsnHistogramComputePercentagesNoMissing = True
>   res at tmXBPrecision = 2         ; set the precision to 2 significant
> digits
>   res at tmYLFormat = "#^se"       ; don't use "e" symbol, always show +/-
>   res at tiXAxisString   = "Rainfall[mm/day]"
>   res at tiYAxisString   = "Number of Grid Points"
>   plot=gsn_histogram(wks,test,res)                 ; create histogram with
> 10 bins
> end
>
> *[Issues/Problems]*
> [1] The script runs fine. The output is attached (output.png). I am not
> sure if  I plotted this correctly. After using ndtooned, I just plotted the
> histogram. Is there a way to check if the y-axis is really the number of
> gridpoints or the x axis is the rainfall class?
> Or is there a way to invoke that the y-axis is the number of gridpoints
> when plotting the histogram?
>
> I'll appreciate any help with this.
>
> Sincerely,
> Lyndz
>
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