Bash scripting 18 – Using data files 4

So, carrying on from the previous article(s).

Using the guide at [2]. We can set a few labels up so the graph looks nicer.

Once in gnu plot you can issue commands, then run replot to redraw the graph.

gnuplot> plot 'log.csv'
gnuplot> plot 'log.csv' with lines
gnuplot> set title 'Example Plot'
gnuplot> set xlabel 'x axis'
gnuplot> set ylabel 'y axis' 
gnuplot> replot
gnuplot> set key top right
gnuplot> replot

By running replot we can see the results are what we want before carrying on.

All this is just a small sample of what can be done, I will explore more on this once I have some useful, rather than randomly generated data to plot or do things with.

References

1 gnuplot 2 gnuplot examples

Chat

I am on the Devon and Cornwall Linux user group mailing list and also their matrix channel as zleap, it is better to ask there, that way others can answer too.

Tags

#Bash,#Bashscripting,#BashScripting,#Files,#UsingDataFiles,#Data,#gnuplot,#graphs

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Bash scripting 17 – Using data files 3

So, carrying on from the previous article(s). I am going to be using gnuplot to display the data. I found a useful site, that has examples of how to use the software, from basic to more advanced examples.

Notes: As with bash gnu plot has command history, so you can use arrow keys to move up / down between previously entered commands.

Based on the information at [2] we can produce a very basic plot of what is in log.csv

Load GNUPlot

gnuplot

and enter

plot 'log.csv'

This example isn't all that good really, but it at least produces some output. I have modified one of the examples further down that page

plot 'log.csv' using 1:2 with lines, 'log.csv' using 1:2 with lines

So the following data set

0, 1
1, 10
2, 10
3, 7
4, 2
5, 1
6, 15
7, 0
8, 19
9, 3

Should produce something like

Adding extra columns

We probably need more than two columns. This is easily done by modifying the loop in the script gendata1.csv. It is a good idea to copy this to a new script so it keeps the original as is

cp gendata1.sh gendata2.sh

As gendata1.sh has write permissions, these will be preserved in the new copy of the file. We can now edit gendata2.sh

echo "number" "data" # for reference, not written to file 
for ((i = 0 ; i < 10 ; i++)); do
    echo $i, $((RANDOM % 20)), $((RANDOM % 20)) # echo to screen (stdout)
	echo $i, $((RANDOM % 20)), $((RANDOM % 20)) >> log.csv # write to file
    #write_csv $(($i, $RANDOM % 10))
done

So all we are doing here is adding in, note the comma

, $((RANDOM % 20))

As the only difference between the lines

echo $i, $((RANDOM % 20)), $((RANDOM % 20)) # echo to screen (stdout)
echo $i, $((RANDOM % 20)), $((RANDOM % 20)) >> log.csv # write to file

Is that the first line, writes to the screen, it may be better to test the script out, check it does what you want, then modify the line that writes to a file once you are happy.

References

1 gnuplot 2 gnuplot examples 3. GNU Plot and LaTeX, included for reference

Chat

I am on the Devon and Cornwall Linux user group mailing list and also their matrix channel as zleap, it is better to ask there, that way others can answer too.

Tags

#Bash,#Bashscripting,#Files,#UsingDataFiles,#Data,#gnuplot,#graphs,#BashScripting

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AI statement : Consent is NOT granted to use the content of this blog for the purposes of AI training or similar activity. Consent CANNOT be assumed, it has to be granted.