GnuPlot - plot points in a data file and plot the count of points also

Question

I have a data file file.dat arranged in this format:

 DataA:
 0 2
 1 3
 7 2
 1 2


 DataB:
 3 2
 6 4
 1 1

I want to get 2 plots from this data file.

a simple plot of these points.
A plot of number of points in each data sets. e.g (DataA has 4 points and DataB has 3 points)

For generating the first plot I am using this

set key autotitle columnheader right 
plot for [i=0:1] 'file.dat' using 1:2 index i with lp

For the other plot I just want a simple bar chart like this:

Where y-axis tells the number of points DataA and DataB have.

I don't understand how to count the points present in the list, simultaneously plotting the data set too.

P.S Can I also get both of the plots side by side?

EDIT: The file.dat can contain multiple datas. e.g

 DataA:
 0 2
 1 3
 7 2
 1 2

 .
 .
 .


DataZ:
3 2
6 4

Michael · Accepted Answer · 2017-04-05 19:26:25Z

3

To count points, use stats. To plot side by side, use multiplot.

stats 'file.dat' using 1:2 every :::0::0  name 'A' # to get stats with prefix 'A_'
stats 'file.dat' using 1:2 every :::1::1  name 'B'
set multiplot layout 1,2 # 1 row, 2 columns
plot for [i=0:1] 'file.dat' using 1:2 index i with lp
set object 1 rect from 1,0 to 3,A_records fc rgb 'red'
set object 2 rect from 5,0 to 7,B_records fc rgb 'red'
set xrange [0:8]
max=(A_records>B_records ? A_records:B_records)+0.5
set yrange [0:max]
set format x ''
unset xtics
set xtics ('DataA' 2, 'DataB' 6)
plot -10 notitle
unset multiplot

https://i.sstatic.net/pNtZZ.png

edited Apr 5, 2017 at 19:26

answered Apr 5, 2017 at 19:21

Michael

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2 Comments

Awaid Shaheen Over a year ago

what if I dont know how much data I am handling? Like in this case I have DataA and DataB but I might generate another file that might look like this: DataA: 0 2 1 3 7 2 1 2 DataB: 3 2 6 4 1 1 DataC: 0 2 1 3 7 2 1 2 DataD: 3 2 6 4 1 1

Michael Over a year ago

Execute stats for your file without conditions, number of blocks is in a variable STATS_blocks. Then use a loop, look at do for [...] construction.

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