Hey guys I am currently working with gnuplot.
I have this .csv file which I have been using to plot some formulas
(eg plot "filename.csv" u 0:day($0) = $0 ). The plots worked out; however, I was wondering if there was a way within gnuplot to save the output of my formulas as a data file too.
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1 Answer
Please check the manual or in the gnuplot console type help table.
Code:
### save data as text
reset session
f(x) = x
g(x) = x**2
h(x) = x**3
set xrange[-5:5]
set samples 11
plot f(x) w lp, g(x) w lp, h(x) w lp
set table "myOutput.dat"
plot '+' u 1:(f($1)):(g($1)):(h($1)) w table
unset table
### end of code
Edit:
Actually, to be more flexible with data separators (e.g. comma or whatever) in the output file, you could change the plot ... w table command to something like the line below. However, I guess, gnuplot will always add a leading space " " and a trailing TAB \t for each line. But maybe this can also be changed.
plot '+' u (sprintf("%g,%g,%g,%g",$1,f($1),g($1),h($1))) w table
Result:
And myOutput.dat:
-5 -5 25 -125
-4 -4 16 -64
-3 -3 9 -27
-2 -2 4 -8
-1 -1 1 -1
0 0 0 0
1 1 1 1
2 2 4 8
3 3 9 27
4 4 16 64
5 5 25 125
Addition: (creating data in a loop)
With set print you are probably the most flexible, no leading space and trailing TAB.
Check the manual or in gnuplot console type help set print.
Code:
### save data as text, independent of range and samples
reset session
f(x) = x
g(x) = x**2
h(x) = x**3
set print "myOutput.dat"
do for [i=-5:5] {
# loop index only takes integers, multiply i with some factor if necessary
print sprintf("%g,%g,%g,%g",i,f(i),g(i),h(i))
}
set print
### end of code
2 Comments
STOI
Is there a way to creating them without calling the plot command?
theozh
of course you can skip the line
plot f(x) w lp, g(x) w lp, h(x) w lp, but you need the line plot '+' u 1:(f($1)):(g($1)):(h($1)) w table. Well, there is another way to print into a file during a for loop, this might even be more clear. I will add this option later. In the meantime you might want to check help set print.