I am trying to plot a 'heatmap' and 'a cut of that heatmap' at a specific position using the data at the bottom. I would like to use use the every command in gnuplot to do so, but I fail. every ::13::17: is supposed to plot data from the line 13 to line 17. I am getting an error from gnuplot.
reset
set terminal pngcairo
set output 'stack.png'
set palette defined (0 "white", 1 "red")
unset key
set style fill solid
#----------------- 2D plot ---------------
plot 'stack.dat' using 1:2:(log10($3)) with boxes linecolor palette notitle
# ---- PLot a section of the 2D plot ----------
set output 'oups.png'
plot 'stack.dat' using 2:(log10($3)) every ::13::17: with lines notitle
'stack.dat' is the datafile name
1 1 0.081051938235759735
1 2 0.039051856845617294
1 3 0.017708625644445419
1 4 0.053782138973474503
1 5 0.069525197148323059
2 1 0.046054631471633911
2 2 0.005992549471557140
2 3 0.010819308459758759
2 4 0.001308800885453820
2 5 0.032604649662971497
3 1 0.078480839729309082
3 2 0.000435109512181953
3 3 0.073167815804481506
3 4 0.052882101386785507
3 5 0.016808584332466125
4 1 0.060769289731979370
4 2 0.028200428932905197
4 3 0.031424820423126221
4 4 0.052520859986543655
4 5 0.078694045543670654
5 1 0.029850590974092484
5 2 0.027807384729385376
5 3 0.036195535212755203
5 4 0.026242787018418312
5 5 0.048620097339153290
How can I make it works? Is there a better way to plot sections of heatmap?
The short answer is to use
plot 'stack.dat' using 2:(log10($3)) every :::2::2 with lines notitle
When you have multiple blocks of records there is a distinction between lines in a datafile and records. So in order to specify a data sequence, you need the block and record indexes. Check the docs for more info (see Every): http://gnuplot.sourceforge.net/docs_5.2/Gnuplot_5.2.pdf