Re: [Gnuplot-info] could gnuplot provide some specific functions?

[Jon <dev...@gm...>]

On Wed, Nov 25, 2009 at 5:27 PM, Thomas Sefzick <t.s...@fz...>wrote:

>
> sure, the plot ranges are determined and are accessible via some
> variables, e.g. GPVAL_Y_MIN, GPVAL_Y_MAX, a.s.o.
>

Thanks for the information, I don't know this ...


>
> but, these variables are set after all functions/data are evaluated,
> not before.
>
> otherwise it would be easy:
>
> plot "datafilename" using 1:2, \
> "" using 3:\
> (GPVAL_Y_MIN+0.5*(GPVAL_Y_MAX-GPVAL_Y_MIN)):\
> (0.5*(GPVAL_Y_MAX-GPVAL_Y_MIN))
>
> but this doesn't work, because at the time these variable are
> used here, they are unset - because autoranging is done after
> all functions/data are evaluated
>

See, since autoranging is done after all functions/data are evaluated, why
not exclude the special case *,u 3:(?)(?),*  from evaluating the GPVAL
parameters, which I don't think is a problem to realize, then the system
automaticall assign the GPVAL_Y_MIN+0.5*(GPVAL_Y_MAX-GPVAL_Y_MIN) and
0.5*(GPVAL_Y_MAX-GPVAL_Y_MIN) to the two question marks, and then return
back to the normal path


>> you could do a dummy plot (set term dumb), where you plot
>> everything except the vertical lines. this would set the axis ranges.
>> and then you would do the real plot, this time with the (errorbars
>> as) vertical lines:
>>
>> set term push
>> set term dumb
>> plot "datafilename" using 1:2
>> set term pop
>> plot "datafilename" using 1:2, \
>> "" using 3:\
>> (GPVAL_Y_MIN+0.5*(GPVAL_Y_MAX-GPVAL_Y_MIN)):\
>> (0.5*(GPVAL_Y_MAX-GPVAL_Y_MIN)) with errorbars pointtype 0
>>
>>
>> bsmile wrote:
>> >
>> > Thanks, this should serve the purpose.
>> >
>> > But still if could the system automatically determine the range of the y
>> > values, say
>> >
>> > u 3:(?):(?), then system automatically determines ( ...y=? ...) = mean
>> of
>> > the y range in the other plots, or in default at 0, (...yerr=? ...) =
>> > standard deviation of y values in the other plots, or in default at 1.
>> >
>> > it seems to me the above functionality is not hard to implement since
>> > there
>> > has been use of (), if there could be a check for ? during syntax
>> sparse,
>> > then accumulate mean and/or std from other column of output. It seems to
>> > me
>> > adding this functionality does not interfere with other existing
>> > functionalities ..
>> >
>> >
>> >
>> > On Wed, Nov 25, 2009 at 4:24 AM, Thomas Sefzick
>> > <t.s...@fz...>wrote:
>> >
>> >>
>> >> plot large errorbars:
>> >>
>> >> unset bars
>> >> set yrange [ ... give some reasonable values here ... ]
>> >> plot 'kkk' u 1:2 w l,'' u 3:(0):(1.e9) with errorbars pointtype 0
>> >>
>> >> explanation:
>> >> using 3:( ... middle of your y-interval ... ):( ... half errorbar
>> >> length, long enough to cover the whole y-range ...)
>> >>
>> >>
>> >> bsmile wrote:
>> >> >
>> >> > sure, but what I mean is to set up a special symbol to mimic a
>> vertical
>> >> > line, e.g.
>> >> >
>> >> > plot 'kkk' u 1:2 w l,'' u 3:(whatever) w l
>> >> >
>> >> > I know that the third column has identical value say at 5, then I
>> hope
>> >> the
>> >> > whatever is the special symbol which draws a vertical line through
>> x=5
>> >> > within the range of column 2. Even if column 3 has dispersed data, if
>> >> > whatever is used, it will still draw a vertical line through x_mean
>> for
>> >> > column 3.
>> >> >
>> >> > Thanks,
>> >> >
>> >> >
>> >> >
>> >> > On Tue, Nov 24, 2009 at 3:03 PM, Thomas Sefzick
>> >> > <t.s...@fz...>wrote:
>> >> >
>> >> >>
>> >> >> because a function assigns one (or no) y-value to a x-value.
>> >> >> a vertical line can not be described by a function.
>> >> >>
>> >> >>
>> >> >> bsmile wrote:
>> >> >> >
>> >> >> > say, vertical line, which can draw a vertical line at specific x
>> >> >> position
>> >> >> > automatically ranging through the plotted region? So far, vertical
>> >> >> lines
>> >> >> > can be drawn, but have to be tricky, if not lengthy. Since gnuplot
>> >> is
>> >> >> > famous for its convenience, why not introduce a simple function to
>> >> >> > accomplish plotting vertical lines?
>> >> >> >
>> >> >>
>> >> >> --
>> >> >> View this message in context:
>> >> >>
>> >>
>> http://old.nabble.com/could-gnuplot-provide-some-specific-functions--tp26500089p26500366.html
>> >> >> Sent from the Gnuplot - User mailing list archive at Nabble.com.
>> >> >>
>> >> >>
>> >> >>
>> >> >>
>> >>
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>> >>
>> >>
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>>
>>
>>
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