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Subject: Re: Filtering and summation of data
Date: Mon, 23 May 2022 07:22:47 +0200
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On 19.05.2022 20:15, thomas.lehm...@googlemail.com wrote:
> Hi,
> 
> considering data in a table where value are categorized.
> I would like to be able a) to filter data for a plot by category
> and b) I would like to sum up all values with same category
> being able to display it in a plot with box.
> 
> Important: the solution should be platform independent;
> as an example "awk" or "sed" is not available on all platforms.
> Yes python would be possible but I really would prefer the
> pure Gnuplot solution if possible.
> 
> Kind Regards,
> Thomas
> 
> Appendix:
> 
> What I. have sofar:
> 
> <code>
> set terminal pngcairo size 1400,1000 enhanced font ",20"
> set output "DemoSum.png"
> 
> $DemoData << EOD
> Timestamp, Category, Value
> 2022-05-19 05:55:00, test1,  5
> 2022-05-19 09:16:00, test2, 15
> 2022-05-19 13:56:00, test3, 10
> 2022-05-20 05:15:00, test1, 20
> 2022-05-20 10:58:00, test2,  5
> 2022-05-20 17:20:00, test3, 25
> EOD
> 
> set datafile separator ","
> set key autotitle columnhead
> 
> # a very simple plot functionality
> set multiplot layout 2, 1 title "Timestamps And Sums"
> 
> # define line style(s)
> set style line 1 lc rgb 'grey30' ps 0 lt 1 lw 2
> set style line 2 lc rgb 'grey70' lt 1 lw 2
> set style fill solid 1.0 border rgb 'grey30'
> 
> set timefmt "%Y-%m-%d %H:%M:%S"
> set xdata time
> set grid
> 
> set title "Data based on date and time"
> plot $DemoData using 1:3 with linespoint linestyle 1
> 
> unset xdata
> set title "Data based on categories"
> plot $DemoData using 3:xtic(2) with boxes linestyle 1
> </code>

stats $DemoData u(strcol(2) eq "test1" ? $3:1/0)
sum_test1 = STATS_sum
print sum_test1

this is one way to get information for one category inside gnuplot.

Jörg