Plot elements of two arrays in Bash

Question

I have two arrays "bitrates" and "psnr". I want to write a bash script to plot it.

bitrates=(1 2 3 4 5)

psnrArray=() psnr array is filled dynamically.

{ echo "${bitrates[*]}"; echo "${psnrArray[*]}"; } >Data

So, you wanna do something, you do it, and now you write about it on SO. Thanks for sharing! But where is your question? — Alfe
– Alfe, Commented Jan 22, 2018 at 10:39
Must-haves of all questions: ① What did you do? ② What did you expect to observe? ③ What did you observe instead? — Alfe
– Alfe, Commented Jan 22, 2018 at 10:40
How to plot it using gnuplot?. And also the data are in rows. I think it should be in columns. — John
– John, Commented Jan 22, 2018 at 10:41
I want a plot in which data from bitrates array will be in x axis and data from psnrarrays will be in y-axis. — John
– John, Commented Jan 22, 2018 at 10:42

Alfe · Accepted Answer · 2018-01-22 10:54:20Z

2

Creating your data file can be done like this:

x=(1 2 3 4)
y=(5 6 7 8)
for ((i=0; i<${#x[@]}; i++))
do
  echo "${x[$i]}" "${y[$i]}"
done > data

Plotting using Gnuplot:

gnuplot -p -e "plot 'data' with lp"

answered Jan 22, 2018 at 10:54

Alfe

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1 Comment

Less readable but shorter for creating the data file would be sth like: paste <(printf "%d\n" "${x[@]}") <(printf "%d\n" "${y[@]}") > data.