[Fwd: [ILUG] gnuplot datafile with rows]

[Lars H. <lhe...@us...>]

 Can anyone help with this?

----- Forwarded message from Karine Dionne <k.d...@ja...> -----

Date: Wed, 25 Jan 2006 09:50:07 -1000 (HST)
From: Karine Dionne <k.d...@ja...>
To: il...@li...
Subject: [ILUG] gnuplot datafile with rows

Hi,

I am new to Gnuplot and to Linux as well and I am having a bit a struggle 
right now.  Here is the format of my datafile:

#Day	Power1	Power2	Power3	Power4	...
Day1	y1	y1	y1	y1	...
Day2	y2	y2	y2	y2	...
Day3 	y3	y3	y3	y3	...

"DayX" is actually a date string, but that is not my problem 
for now.  Each column is a power measurement  given by a specific 
powermeter.  There are two types of plots I need to do.

To begin, I want to compare the performance of each powermeter on a single 
plot.  So, I would need to generate an X vector for the powermeters' IDs 
(from 1 to 32 in steps of 1) and I don't know how to do that.  I would 
also need to be able to tell gnuplots to proccess rows, not columns. I 
browsed the internet and the mailing lists, I found one thread about it. 
It was in March 2000 and it says that you have to reformat your file in 
another file and then plot the columns.

There are 2 reasons why I don't want to do that.  First of all, this is a 
log file that will become very big with time.  I am not interested in 
having to keep two copies of them.  I could keep only the transposed copy, 
but this solution is not possible because of the second type of plot I 
need.  I want to track the changes with time of the power meters.  I will 
use the date string as the X axis and the other columns as Y.  So, one way 
or another, I have to access rows of data for one of my two plots.

I would like to know if there is a possibility to do that with gnuplot or 
if I should consider using something else that could do the job.  I with 
to find something efficient and as straight forward as possible.  I hope I 
am not asking for to much.

Thanks for your time and expertise.

Karine

----- End forwarded message -----