Re: [Gnuplot-info] What am I doing wrong?

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

i don't see anything wrong. i tried to reproduce your problem:

a file named 'ts.dat' has the content:
1	0.67	0.04
2	0.27	0.09


1	0.67	0.05
2	0.39	0.05


in gnuplot i executed the following commands:
set xrange [0:3]
plot 'ts.dat' index 0 us 1:2:3 w yerr, 'ts.dat' index 0 us 1:2 w lp
plot 'ts.dat' index 1 us 1:2:3 w yerr, 'ts.dat' index 1 us 1:2 w lp

and got two plots each with 2 points with errorbars and a connecting line.
http://www.nabble.com/file/p11321444/ts1.gif 
http://www.nabble.com/file/p11321444/ts2.gif 

maybe you should reproduce this simple example.

thomas


Praedor Atrebates wrote:
> 
> I am still playing around with gnuplot, trying to figure out how to use it 
> under my data requirements.  
> 
> Right now, I am trying to figure out how to plot two y data points, a
> "before" 
> and "after" type of data vs the two-state x-axis required.
> 
> The data acquisition software I use puts all the data into distinct
> columns of 
> all the y data from "before" in the first column, all the y data from
> "after" 
> in the second column, and the difference between the two in the third
> column 
> (but this 3rd is dispensible)
> 
> For each run I get 12 individual datapoints for "before" and 12 for
> "after".  
> I determine the mean and stddev and then wish to plot this data as either 
> points with yerr, linespoints with yerr, or boxes (histogram) with yerr. 
> The 
> latest iteration of my attempt to accomplish this is to create a csv file 
> containing:
> 
> 1	0.67	0.04
> 2	0.27	0.09
> 
> 
> 1	0.67	0.05
> 2	0.39	0.05
> 
> and so on.
> 
> I THOUGHT I understood 'index' such that if I specified that I wanted to
> plot 
> the top set of numbers (x:y:yerr) that all I had to do was:
> 
> plot 'filename' index 0 using 1:2:3 with yerr pt 6 ps2   (or something 
> similar...though how does one specify yerr with linespoints or boxes - all
> I 
> ever get when attempting either is 'conflicting with' or something along
> that 
> line)
> 
> Instead of what I expected from the above plot command, two points plotted 
> with error bars, one point at x=1, y=0.67, yerr=0.04 and the other at x=2, 
> y=0.27, yerr=0.09, I get ONE point at x=1, y=0.67, yerr=0.04.  I have
> tried 
> playing with index such as "index 0:0", no index, "index 0:1" etc, just to 
> try to get a consistent outcome.  If I use no index, then I get a set of 
> points ONLY at x=1 and nothing else.
> 
> What am I misunderstanding about index and why is the '2' in the second
> row 
> ignored?  In this plot, 1 means "before" and 2 means "after".  
> 
> patrick
> 
> -- 
> Reichstag fire is to Hitler as 9/11 is to Bush
> 
>  
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