gnuplot-info

[Gnuplot-info] Plotting y-data vs two x-axis points?

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

I have gnuplot 4.2 installed and have been trying to figure out how
to plot my experimental data output.  The data is in the form of 2=20
columns, the first column labeled "prescan" and the second column=20
labeled "postscan".  Beneath these labels in each column are numbers,
something like this:

prescan postscan
0.55    0.62
0.51    0.64
0.53    0.64

and so on.  What I need to do is plot these numbers over the x-axis
over its appropriate label (prescan or postscan) and that's it.  I
have been going over the gnuplot docs and demos but have not yet=20
found what I'm looking for (it is slow going).  What I want is akin
to this:

1.0	|
	|
	|
	| 				*
	| 	 * 			*
	|	 *
0.5	| 	 *			*
	|
	|
	|
	|
   	|________________________________
           	|                   	 |
        	prescan             postscan

How do I do this?  How do I get gnuplot to simply take my two column
header/labels and place them as the points on the x-axis and then plot
the datapoints over them?  I have been going over the documentation and=20
various web FAQs and tutorials, and though I find many examples that are=20
close to what I am after, nothing ever actually gets me to above graph (the=
y=20
points may at times be plotted as linespoints or as histograms too but that=
 I=20
can handle).

I would be most grateful for aid here.

Praedor
=2D-=20
Reichstag fire is to Hitler as 9/11 is to Bush

Re: [Gnuplot-info] Plotting y-data vs two x-axis points?

[Thomas S. <t.s...@fz...>]

set xrange [0:3]
set yrange [0:1]
set xtics ("prescan" 1, "postscan" 2)
plot "datafilename" using (1):1, "" using (2):2


Praedor Atrebates wrote:
> 
> I have gnuplot 4.2 installed and have been trying to figure out how
> to plot my experimental data output.  The data is in the form of 2 
> columns, the first column labeled "prescan" and the second column 
> labeled "postscan".  Beneath these labels in each column are numbers,
> something like this:
> 
> prescan postscan
> 0.55    0.62
> 0.51    0.64
> 0.53    0.64
> 
> and so on.  What I need to do is plot these numbers over the x-axis
> over its appropriate label (prescan or postscan) and that's it.  I
> have been going over the gnuplot docs and demos but have not yet 
> found what I'm looking for (it is slow going).  What I want is akin
> to this:
> 
> 1.0	|
> 	|
> 	|
> 	| 				*
> 	| 	 * 			*
> 	|	 *
> 0.5	| 	 *			*
> 	|
> 	|
> 	|
> 	|
>    	|________________________________
>            	|                   	 |
>         	prescan             postscan
> 
> How do I do this?  How do I get gnuplot to simply take my two column
> header/labels and place them as the points on the x-axis and then plot
> the datapoints over them?  I have been going over the documentation and 
> various web FAQs and tutorials, and though I find many examples that are 
> close to what I am after, nothing ever actually gets me to above graph
> (they 
> points may at times be plotted as linespoints or as histograms too but
> that I 
> can handle).
> 
> I would be most grateful for aid here.
> 
> Praedor
> -- 
> Reichstag fire is to Hitler as 9/11 is to Bush
> 
>  
> -------------------------------------------------------------------------
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View this message in context: http://www.nabble.com/Plotting-y-data-vs-two-x-axis-points--tf3970663.html#a11275586
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[Gnuplot-info] Plotting y-data vs two x-axis points?

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

Thank you for the fast response.

I have another question to build from the previous and one question on gene=
ral=20
usage.  First, now that I can plot each column separately and above the=20
appropriate x-axis label, if I then wanted to connect the two points with a=
=20
line how would I do this?  They are in separate columns...

=46inal question relates to adding error bars to the plots.  I have been ab=
le to=20
get error bars plotted with the points but so far I had to do so in a=20
separate plot overlay, ie:

plot './datafile.csv' using 2:3 with points pointtype 6 pointsize 2, '' usi=
ng=20
2:3:5 with yerr

I have tried what SEEMED natural but it errors out:

plot 'datafile' using 2:3:5 with points pointtype 6 pointsize 2 yerr

When you need to plot data using multiple parameters that use the "with"=20
command, how do you do it when the gnuplot commandline wont accept them all=
=20
in one line/command string?

>From: Thomas Sefzick <t.s...@fz...>
>To: gnu...@li...
>set xrange [0:3]
>set yrange [0:1]
>set xtics ("prescan" 1, "postscan" 2)
>plot "datafilename" using (1):1, "" using (2):2
>Praedor Atrebates wrote:=20
>> I have gnuplot 4.2 installed and have been trying to figure out how
>> to plot my experimental data output. =A0The data is in the form of 2=20
>> columns, the first column labeled "prescan" and the second column=20
>> labeled "postscan". =A0Beneath these labels in each column are numbers,
>> something like this:
>>=20
>> prescan postscan
>> 0.55 =A0 =A00.62
>> 0.51 =A0 =A00.64
>> 0.53 =A0 =A00.64
=2D-=20
Reichstag fire is to Hitler as 9/11 is to Bush