[ncl-talk] Percentage outputs for pie charts

[Dennis Shea]

There was a bug in the 'fspan' function that allowed something it should
not have.

Some considered that a "feature"    :-)

---

See: http://ncl.ucar.edu/prev_releases.shtml#6.2.1
        Specifically, the 'Bugs Fixed' note of 'fspan
---
The 'pie-chart' code inadvertently took advantage of that "feature".

You can be a tester of a fix which will be released with 6.4.0.


load  "./pie_chart.ncl"

See attached.

Cheers

On Mon, Feb 29, 2016 at 3:57 PM, Brian Squitieri <brianjs at iastate.edu>
wrote:

> Good Afternoon,
>
> I have been attempting to plot percentages within a pie chart, but I
> receive the following output and associated error for my NCL script:
>
> (0)     Percent of peak wind times at 0000 UTC: 0%
> (0)     Percent of peak wind times at 0300 UTC: 6.45161%
> (0)     Percent of peak wind times at 0600 UTC: 51.6129%
> (0)     Percent of peak wind times at 0900 UTC: 35.4839%
> (0)     Percent of peak wind times at 1200 UTC: 6.45161%
> (0)     Percent Total: 100%
> fatal:fspan: number of elements parameter is less-than-or-equal-to one,
> can't continue
> fatal:["Execute.c":8575]:Execute: Error occurred at or near line 4026 in
> file $NCARG_ROOT/lib/ncarg/nclscripts/csm/shea_util.ncl
>
> fatal:["Execute.c":8575]:Execute: Error occurred at or near line 44 in
> file pie_chart_example.ncl
>
> Reviewing past NCL help requests in 2010 and 2015 have shown that an
> adjustment was necessary for the pie_chart function; specifically
> npts = round( pcPie(n), 3)
> changes to
> npts = max( (/round( pcPie(n), 3), 1/) )
>
> I run NCL version 6.3.0 and this adjustment is already made in the base
> code, and all variables in my script are converted to floats. Output shows
> that the sum of all percentages equates to one hundred, so I am unsure what
> is wrong here. I had attempted to round both with and without truncation,
> but nothing was helpful. Any assistance would be greatly appreciated. Below
> is the code and attached is the .txt file which contains the data set used.
>
>
> ;Load vital libraries and begin program
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/shea_util.ncl"
> begin
> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
> ;Retrieve data from .txt file
>         ruc  =
> asciiread("/tera0/brianjs/observations/ruc_analysis/LLJ_stats/LLJ_stats_all.txt",-1,"string")
> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
> ;First, retrieve time data as a string
>         ruc_time  = str_get_field(ruc,4,",")
>
> ;Convert data into floats
>         ruc_times  = stringtofloat(ruc_time)
>         dimall = new(1,float)
>         dimall = dimsizes(ruc_times)
>
> ;Calculate time percentages statistics
>         count = new(5,float)
>         count = (/1,3,6,9,12/)          ;Corresponds to 0000 UTC, 0300
> UTC, 0600 UTC, 0900 UTC, and 1200 UTC, respectively
>
>         time_percents = new(5,float)
> do i = 0,4
>         time_percents(i) = (num(ruc_times.eq.count(i))/dimall)*100
> end do
> print("Percent of peak wind times at 0000 UTC: "+time_percents(0)+"%")
> print("Percent of peak wind times at 0300 UTC: "+time_percents(1)+"%")
> print("Percent of peak wind times at 0600 UTC: "+time_percents(2)+"%")
> print("Percent of peak wind times at 0900 UTC: "+time_percents(3)+"%")
> print("Percent of peak wind times at 1200 UTC: "+time_percents(4)+"%")
> print("Percent Total: "+sum(time_percents)+"%")
> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
> ;Pie chart resources
>         wks = gsn_open_wks("x11","LLJ_time_stats")
>         color = (/"red","dark green","blue","purple","sienna3"/)
>         name = (/"0000 UTC","0300 UTC","0600 UTC","0900 UTC","1200 UTC"/)
>
>         pres = True
>         pres at gsnDraw  = False
>         pres at gsnFrame = False
>
> ;Pie Chart
>         pie = pie_chart(wks,time_percents,name,color,pres)
> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
> end
>
>
>
>
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