Re: [Gnuplot-info] errorbars

[Praedor A. <pr...@ya...>]

On Wednesday 19 September 2007 11:29:59 blooopsi wrote:
> the command is
>
> plot `agevsgamm.dat` with yerrorbars
>
> the data set contains of four columns of numbers so i think that normally
> it should plot asymmetric errorbars on the datapoints which it isnt
> doing.it is plotting errorbars but not on my datapoints. they are plotted
> below the data points which is an absoulte miracle to me why it would do
> that.

Sadly, I am no gnuplot expert.  I did what you likely did and read the=20
instructions ("help errorbars", etc).  From the gnuplot help information it=
=20
is clear that 4 columns SHOULD work as you expect.  I quickly threw togethe=
r=20
a datafile that contained 4 columns of "data" with the last 2 intended for=
=20
minus and plus y error numbers.  Plotting thus, 'plot "./test.dat" using=20
1:2:3:4 with yerrorbars' produces a nonsense plot.  The x and y data is=20
plotted properly but the two y error columns are, like you experience,=20
plotted separate from the actual xy data (though the plus and minus y error=
=20
bars are correct).  Same result if I simply do 'plot "./test.dat" with=20
yerrorbars'.  Simply changing the command to 'plot "./test.dat" using 1:2:3=
=20
with yerrorbars' DID plot properly with the symmetrical y error bars=20
coincident with the datapoints.=20

Someone with much more expertise/experience is going to have to jump in her=
e. =20
It seems that gnuplot is behaving contrary to what its in-program help=20
indicates it should. =20

praedor
=2D-=20
=E2=80=9CThe whole problem with the world is that fools and fanatics are al=
ways so=20
certain of themselves, but wiser people so full of doubts.=E2=80=9D
 - Bertrand Russell