CODEWITHSUNDEEP
gnuplot
chaitanya majjari
chaitanya majjari

Reputation: 271

Gnuplot error with awk in plot command

I have got the following errors while the using the code.

gnuplot> set terminal epslatex size 13.1cm,6cm color colortext
Terminal type set to 'epslatex'
Options are '   leveldefault color colortext \
   dashed dashlength 1.0 linewidth 1.0 butt noclip \
   nobackground \
   palfuncparam 2000,0.003 \
   input size 13.10cm, 6.00cm "" 11  fontscale 1.0 '
gnuplot> set output 'C:\MajCha\gnuplot\alpha_cl.tex'
gnuplot> filename= 'C:\MajCha\gnuplot\DU_08-W-180-65_cf_c_02_InpPrePro.txt'
gnuplot> #
gnuplot> set xrange [-10:10]
gnuplot> set yrange [-3:3]
gnuplot> plot "< awk '$1==-180.0 { print $2, $3 }'" filename using 2:3
         warning: Skipping unreadable file "< awk '$1==-180.0 { print $2, $3 }'"
         No data in plot

gnuplot> #
gnuplot> unset output
gnuplot> reset

How could I fix this error.I want the check I made §1=-180 in a loop range from -180 to 180. Please suggest me some possible ways to do.

With using the following code 

reset
set terminal epslatex size 13.1cm,6cm color colortext
set output 'C:\MajCha\gnuplot\alpha_cl.tex'
filename= 'C:\MajCha\gnuplot\DU_08-W-180-65_cf_c_02_InpPrePro.txt'
#
unset key
set xrange [-10:10]
set yrange [-3:3]
plot for [i=-180:180] filename using (($1==i)?$2:1/0):3 
#
unset output
reset

The output figure is enter image description here With using the following code 

reset
set terminal epslatex size 13.1cm,6cm color colortext
set output 'C:\MajCha\gnuplot\alpha_cl.tex'
filename= 'C:\MajCha\gnuplot\DU_08-W-180-65_cf_c_02_InpPrePro.txt'
#
unset key
set xrange [-10:10]
set yrange [-3:3]
plot for [i=-180:180] filename using (($1==i)?$2:1/0):3 with lines 
#
unset output
reset

the output figure is enter image description here

Upvotes: 0

Views: 594

Answers (1)

Joce
Joce

Reputation: 2332

Since filename is a gnuplot variable in your MWE, what you can do is concatenate its contents to the awk command: 

plot "<awk '$1==-180.0 { print $2, $3 }' ".filename using 1:2

Don't miss out the space character before the closing ": this will evaluate the command 

awk '$1==-180.0 { print $2, $3 }' C:\MajCha\gnuplot\DU_08-W-180-65_cf_c_02_InpPrePro.txt

which is I believe what you want to do. Presently, it is evaluating awk with no file at all, thus there is no data.

Note that since your awk commands prints only $2 and $3, its output consists of 2 columns, so you probably want using 1:2 in gnuplot.

Finally, if this MWE is close to what you really want to achieve, I would advise to drop awk and use gnuplot commands only for simplicity:

plot filename using (($1==-180)?$2:1/0):3

Upvotes: 1

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