Re: [Gnuplot-info] Conditional plot with lines

[mattyd <mat...@ho...>]

I have tried this code and it works great. But I am having trouble getting
this approach to work with time-series data. I have replaced the first
column of the test.dat file with dates:

test.dat (revised)
*************
2001-1-1 2 1
2001-1-2 2 4 
2001-1-3 1 9
2001-1-4 2 16
2001-1-5 1 25
2001-1-6 2 36
*************

when I run the following lines:

set xdata time
set timefmt '%Y-%m-%d'
lastx = NaN ; lasty = NaN ; selection = 2
plot 'test.dat' using
($2==selection?($1,lastx=$1):lastx):($2==selection?($1,lasty=$3):lasty) with
linespoints

I get the following message:

Warning: empty x range [2001:2001], adjusting to [1980.99:2021.01]

and it looks like all of the x values are read as 2001.

When I do a test plot without conditions (i.e., plot 'test.dat' using 1:3
with linespoints) it looks fine, so it seems that the problem lies with the
approach of using the previous point, but I can't figure out what it is.

Can anyone please help?



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