Re: [Gnuplot-info] simple row/col plot: 1st row to xtics & autocolumn

[Ethan A M. <eam...@gm...>]

On Sunday, 28 October 2018 12:53:35 theozh wrote:
> It should be a rather simple task, but I have several problems (using gnuplot 5.2rc4, Win7)
> Imagine the following data:
> 
$Data <<EOD
xxxx	ColA	ColB	ColC	ColD
Row1	1.10	1.20	1.30	1.40
Row2	2.10	2.20	2.30	2.40
Row3	3.10	3.20	3.30	3.40
Row4	4.10	4.20	4.30	4.40
EOD
 
> 
> The tasks and questions are:
> 1. plot circles with size which correspond to the datanumber and at a position which correspond to the number of col and row of datafield

So you want column# for x and row# for y?

set key autotitle columnhead       # Tells gnuplot the first row is not data
unset key                          # But we aren't really using it for the key
set xrange [0:5]; set yrange [0:5]
plot for [j=2:5] $Data using (real(j-1)):($0+1):(column(j)/10.) with circles

> 2. take ytics from the first column

Same plot command but add :ytic(1)

> 3. take xtics from the first row

Same plot but add :xtic(columnhead(j))

> 4. the number of columns can depend on the datafile. How to autmatically account for this?

set key autotitle columnhead
unset key
set style data circles
set xrange [0:5]; set yrange [0:5]
plot for [j=2:*] $Data using (real(j-1)) \
                           : (column(0)+1) \
                           : (column(j)/10.) \
                           : ytic(1) \
                           : xtic(columnhead(j))


> 5. how to adjust the right xrange and yrange (i.e., such that the Row1 and Row2 ytics are not at the very edge of the graph.
> 
> ad 1. ok
> ad 2. ok
> ad 3. how do I put columnheader not as key but as xtics? Had no success with columnhead(x)
> ad 4. if I use plot for [i=2:*] $Data... gnuplot get's stuck and does not respond anymore. Why? How to solve?

That was a bug in the original 5.2 release. Fixed in 5.2.1
If you are stuck with 5.2.0 then a work-around would be to determine
the number of columns first and use that explicitly rather than using *.

	Ethan



> ad 5. maybe there is a way without doing stats $Data first?
> 
> I tried with the code below. Thank you for hints.
> 
> 
> ### gnuplot code
> reset session
> 
> $Data <<EOD
> xxxx	ColA	ColB	ColC	ColD
> Row1	1.10	1.20	1.30	1.40
> Row2	2.10	2.20	2.30	2.40
> Row3	3.10	3.20	3.30	3.40
> Row4	4.10	4.20	4.30	4.40
> EOD
> 
> stats $Data u 0 nooutput
> set yrange[STATS_min-0.5:STATS_max-0.5]
> 
> plot for [i=2:5] $Data u (i-2):0:(column(i)/10.):ytic(1) every ::1 with circles notitle
> ### end code