Re: [Gnuplot-info] Accessing first column, first row

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

on a unix system:

STARTING_TIME = system("awk \"{if (NR == 1) print \\\$1}\" filename")

or

write a little program in the programming language of your choice
which returns the 1st word of the 1st line of a file and call it using the
'system' function.

or

temp = system ("cat filename")
STARTING_TIME = word(temp,1)

(replace 'cat' by e.g. 'type' on a dos/win system,
will not work for large files, because the whole data is written into a
variable)

or

temp = system ("head -n1 filename")
STARTING_TIME = word(temp,1)


Markus Eich wrote:
> 
> Hi,
> 
> for a plot I have in a datafile the time in ms stored in the first 
> column. The time does not start from 0, but something like
> 1191342868.608249
> For the plot I just want to plot the relative elapsed time. What I want 
> to do is to store the starting time in a variable STARTING_TIME and plot 
> the date with a call like
> 
> plot filename using ($1-STARTING_TIME):10 title "MOTCUR_M1" with lines
> 
> How can I access this data field?
> 
> Best,
> 
> /Markus
> 
> 
> -- 
> Dipl. Inform. Markus Eich
> Research Assistant
> Robotics Lab at
> DFKI Bremen
> German Research Center for Artificial Intelligence
> 
> Email:  mar...@df...
> Tel.:   +49 (421) 218-64105
> Fax :   +49 (421) 218-64150
> Room:   212
> 
> Postal address:
> DFKI Bremen
> Robotics Lab
> Markus Eich
> Robert-Hooke-Strasse 5
> 28359 Bremen
> Germany
> 
> Further informations:
> http://www.dfki.de/robotics 
> 
> 
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