Re: [Gnuplot-info] Using Single Data column as X axis Data

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

if you want to compare the y-data without caring for the exact time values
(works if the x values are equidistant):

plot 'datFile1' using 0:2, 'datFile2' using 0:2

if you care for the exact time values in 'datFile1', then subtract the time
shift of each file in respect to 'datFile1' (in seconds):

set xdata time
set timefmt "%H:%M:%S"
plot 'datFile1' using 1:2, 'datFile2' using (timecolumn(1)-1084.):2

and, use at least gnuplot 4.2


JamieRGraves wrote:
> 
> Hello,
> 
> I have a the following problem, and haven't managed to find an answer to
> it yet. I have a number of data files, which look something like:
> 
> datFile1:
> 
> 14:58:37.5807098 	 20.28985
> 14:58:38.6623082 	 15.71429
> 14:58:39.7639362 	 20
> 
> datFile2:
> 
> 15:16:41.0575811 	 4.285715
> 15:16:42.1391903 	 24.63768
> 15:16:43.2207995 	 14.49275
> 
> These are two representative examples of about 8 data files I need to
> plot. I'm interested in only using the first column from datFile1 as the X
> axis data. The Y axis data will then be taken from column 2 from all of
> the files. 
> 
> How would I go about telling gnuplot to use only this first column in the
> first file as the X axis data? Is it a case of assigning the use of the
> first column from datFile1 as a variable?
> 
> Thanks in advance for your help in this matter.
> 
> - Jamie
> 

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