Re: [Gnuplot-info] datablocks, steps and noautoscale

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

After more experimentation I find that there is indeed a bug triggered by
the combination of "noautoscale" and data points that receive a
categorization "UNDEFINED".  It is not specific to plot style "fillsteps"
but it may explain the unexpected fill areas in your test case.

On Wed, Jun 13, 2018 at 9:06 AM, Ethan A Merritt <eam...@gm...>
wrote:

> On Wednesday, 13 June 2018 08:45:55 theozh wrote:
> > Hi,
> > I am trying to plot datablocks separated by some empty lines using
> fillsteps with "noautoscale".
> > See the example code below.
> > Top left: OK. That's the data with autoscale
> > Top right: Not what I expect. Strange lines with steps when using
> "noautoscale"
> > Bottom left: OK. fillsteps with autoscale
> > Bottom right: Not what I expect. Strange fillsteps when using
> "noautoscale"
> >
> > What's wrong with me or my code?
>
>
> I am not sure I understand the question, but I'll try to add some
> information that might help.
>
> The default range on both x and y is [-10:10].
> If you do not specify a different range and you do not use autoscaling,
> then that's what you get.
>
> Normally the presence of blank lines in a data file indicates
> separate data sets that will be selected using the "index" keyword.
> I am not certain whether the presence of blank lines in a data block
> works identically to those in a file.  I think there were some relevant
> patches recently but I did not pay much attention to them.
> In any case your plot commands do not include any "index" keyword
> so the intent in unclear.
>
> If I fill in the first column of data "7\n8\n9\n ..." but leave the
> second column blank then I get a plot which may be more like you
> were expecting except that the lower left plot has fill areas
> extending below zero.  I can't immediately explain why the fill area
> goes negative, but also I think the documentation for "help fillsteps"
> is not entirely clear on what to expect in this case.
>
> Does that clarify anything?
>
>         Ethan
>
>
>
> >
> > # datablocks with empty lines and steps and noautoscale
> > reset
> > $Data <<EOD
> > 1 0
> > 2 0
> > 3 1
> > 4 1
> > 5 0
> > 6 0
> >
> > 10 0
> > 11 0
> > 12 1
> > 13 1
> >
> > 17 1
> > 18 1
> > 19 0
> > 20 0
> > EOD
> >
> > set multiplot layout 2,2
> > set key top left
> >
> > plot x,\
> >   $Data u 1:($2*10) w p lt 7 lw 2 title "points",\
> >   $Data u 1:($2*10) w steps lw 2 title "steps"
> > plot x,\
> >   $Data u 1:($2*10) w p lt 7 lw 2 title "noautoscale" noautoscale,\
> >   $Data u 1:($2*10) w steps lw 2 title "noautoscale" noautoscale
> > plot x,\
> >   $Data u 1:($2*10) w fillsteps fs transparent solid 0.1 title
> "fillsteps"
> > plot x,\
> >   $Data u 1:($2*999) w fillsteps fs transparent solid 0.1 title
> "noautoscale" noautoscale
> > unset multiplot
> > # EOF
> >
> >
> >
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