gnuplot-info

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

[JamieRGraves <chi...@gm...>]

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

[JamieRGraves <chi...@gm...>]

Thanks, that makes sense, and works like a charm. 

Another quick question - how would I go about plotting the average of the
values returned in column 2 from the dat file? Can this be achieved with
gnuplot, or should I calculate this within software?


Thomas Sefzick wrote:
> 
> 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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Re: [Gnuplot-info] Using Single Data column as X axis Data

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

JamieRGraves wrote:
> 
> Another quick question - how would I go about plotting the average of the
> values returned in column 2 from the dat file? Can this be achieved with
> gnuplot, or should I calculate this within software?
> 

if you need the average of all y-values of one datafile (or the average of
all y-values of all datafiles), then have a look at
http://gnuplot.sourceforge.net/demo_4.3/data_feedback.html

if you need the average of the y-values from several datafiles for each
specific x-value, then - i think - it's easier to calculate these averages
outside gnuplot.

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

[JamieRGraves <chi...@gm...>]

Many thanks. I'll calculate it outside of gnuplot. 


Thomas Sefzick wrote:
> 
> 
> JamieRGraves wrote:
>> 
>> Another quick question - how would I go about plotting the average of the
>> values returned in column 2 from the dat file? Can this be achieved with
>> gnuplot, or should I calculate this within software?
>> 
> 
> if you need the average of all y-values of one datafile (or the average of
> all y-values of all datafiles), then have a look at
> http://gnuplot.sourceforge.net/demo_4.3/data_feedback.html
> 
> if you need the average of the y-values from several datafiles for each
> specific x-value, then - i think - it's easier to calculate these averages
> outside gnuplot.
> 
> 

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