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Pass shell variable to gnuplot

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# 1  
Old 05-02-2012
Pass shell variable to gnuplot
Hi
I am plotting a series of CDFs using gnuplot using
Code:
plot "data" u 1:(1./x.) smooth cumulative

I am doing this over many files and I need to tune the x value to the number of lines that meets a particular condition.

Is it possible to get the line count from shell using
Code:
cat file | grep CONDITION | wc -l

and pass it on to gnuplot by any means?

Thanks a lot.
# 2  
Old 05-02-2012
Yes.

Code:
condition_cnt=$(grep -c 'CONDITION'  $file)
plot "data" u 1:(1./${condition_cnt}.) smooth cumulative

# 3  
Old 05-02-2012
Another way is things like this:

Code:
gnuplot <<EOF
variable=$(shellcode)
etc
etc
plot "data" u 1:(1./x.) smooth cumulative
EOF

Just remember you'll have to escape dollar signs that actually belong in there.
# 4  
Old 05-03-2012
wow thanks guys! trying it out Smilie Smilie

---------- Post updated at 01:33 PM ---------- Previous update was at 11:44 AM ----------

@Jim:

I tried out your suggestion and it returns me an error- Column number expected.

Here is my code-
Code:
cnt1=$(grep -c ''  $../processing_old/buffer_a.txt)
cnt2=$(grep -c 'ALTEREDPLAY'  $buffer_a.txt)
cnt3=$(grep -c ''  $../processing_new/buffer_a.txt)
cnt4=$(grep -c 'ALTEREDPLAY'  $../processing_new_3buff/buffer_a.txt)

plot  '../processing_old/buffer_a.txt' u 15:(1./cnt1.) title "Strobe 1.6" smooth cumulative ls 10 lw 6,\
        'buffer_a.txt' u 16:(16./cnt2.) title "Panic 1.6" smooth cumulative ls 3 lw 6,\
        '../processing_new/buffer_a.txt' u 15:(1./cnt3.) title "Strobe 2.0" smooth cumulative ls 8 lw 6,\
        '../processing_new_3buff/buffer_a.txt' u 16:(1./cnt4.) title "Panic 2.0" smooth cumulative ls 2 lw 6

What is wrong here Smilie
# 5  
Old 05-03-2012
Try using backquotes instead of the $() syntax. Like this:
var=`command`



Lee Phillips
----------------
gnuplot Cookbook
Available on Amazon
# 6  
Old 05-04-2012
Hi

Placing ` ` seems to have cleared the error that I was getting. But now I am getting an error here
Code:
plot  '../processing_old/buffer_a.txt' u 15:(1./cnt1.) title "Strobe 1.6" smooth cumulative ls 10 lw 6,\
        'buffer_a.txt' u 16:(16./cnt2.) title "Panic 1.6" smooth cumulative ls 3 lw 6,\
        '../processing_new/buffer_a.txt' u 15:(1./cnt3.) title "Strobe 2.0" smooth cumulative ls 8 lw 6,\
        '../processing_new_3buff/buffer_a.txt' u 16:(1./cnt4.) title "Panic 2.0" smooth cumulative ls 2 lw 6

The error being invalid expression. :-|

Also I get a similar error for the case of Corona688's suggestion as well.
Last edited by jamie_123; 05-04-2012 at 04:52 AM.. Reason: update
# 7  
Old 05-04-2012
Why do you have a dot after the variable name? You are writing "1./cnt1.", etc. Try it without the dot.




Lee Phillips
----------------
gnuplot Cookbook
Available on Amazon
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