Gnuplot plotting data from a file up to some row

Question

I have data in some text file which has let\'s say 10000 rows and 2 columns. I know that I can plot it easily by plot \"filename.txt\" using 1:2 with lines . Wh

Answer 1

You can probably cut out the reliance on an external utility (If your system doesn't have them installed for example) using the pseudo-column 0.

see help plot datafile using pseudocolumn

Try something like:

LINEMIN=1000
LINEMAX=2000

#create a function that accepts linenumber as first arg
#an returns second arg if linenumber in the given range.
InRange(x,y)=((x>=LINEMIN) ? ((x<=LINEMAX) ? y:1/0) : 1/0)

plot "filename.txt" using (InRange($0,$1)):2 with lines

(tested on Gnuplot 4.4.2, Linux)