gnuplot-info

[Gnuplot-info] technical assistance

[Abhishek T. <pl...@no...>]

Hi=20
I would be grateful if you could help me getting the following sorted. I am=
 writing to you from the School of Biosciences with a minor request of tech=
nical support. Attached is a plot of a data showing an accuracy range. The =
shaded gray area represents the variation range of the results predicted by=
 a model with different test scenarios. The problem is that this plot has b=
een prepared by an author at the USDA-Forest Services, USA and now I want t=
o use a similar style to plot my data from a similar problem. It is very im=
pressive since it shows the results with clarity. He suggests that it was d=
one using corel DRAW. I wish you would be able to help me out with the work=
. So basically we have the results with two sets of mean values and accurac=
y ranges shown using error bars (see the word ducument file). Now I want to=
 use a technique similar to what was done in the attached figure to represe=
nt the result as a shaded region (covering the accuracy range) rather than =
the conventional line with y-error bars plotted in Excel. This is required =
since I am showing accuracy range on both experimental and model predicted =
results and at present simply plotting them as error bars  (see the word do=
cument file) seems to be overlapping in a very narrow range which may be co=
nfusing to the readers.

I am sure you will be able to help me out. Looking forward to hear back on =
this asap since the work has to be sent to a paper after revision in 2-week=
's time.

Regards

Abhishek Tiwary
Research postgraduate
Agricultural and Environmental Sciences
School of Biosciences
University of Nottingham
University Park=20
Nottingham, NG7 2RD
UK



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Re: [Gnuplot-info] technical assistance

[<br...@ph...>]

Abhishek Tiwary wrote:

> with the work. So basically we have the results with two sets of mean
>  values and accuracy ranges shown using error bars (see the word 
> ducument file). Now I want to use a technique similar to what was 
> done in the attached figure to represent the result as a shaded 
> region (covering the accuracy range) rather than the conventional 
> line with y-error bars plotted in Excel.

That plot style is known as an "error band".  gnuplot until version 4.0
could not possibly support it.  Nowadays, it might actually be able to,
but you have to lend it a hand.  You'll have to plot 3 datasets in
different styles:

1) the experimental data and their errors "with errorbars"
2) the model central value "with lines"
3) the model error region "with filledcurves", and with a specially
    crafted data file.

Otherwise, you'll have to resort to plotting the model "with
boxxyerrorbars", or by doing two additional plots "with lines" at the
upper and lower error limit (and maybe fill in that area in 
postprocessing, possibly even in CorelDraw if you absolutely have to).