Re: [Gnuplot-info] Data File with Group-Indexed Lines

[Yub Y. <yu...@ro...>]

>________________________________
> From: walter harms <wh...@bf...>
>To: gnu...@li... 
>Sent: Friday, September 28, 2012 10:34 AM
>Subject: Re: [Gnuplot-info] Data File with Group-Indexed Lines
> 
>Am 28.09.2012 16:02, schrieb Yub Yub:
>> Hi all, I'm new to gnuplot.
>> 
>> I'm using gnuplot 4.6.0 on Ubuntu 12.04.
>> 
>> 
>> I've done a bunch of reading of tutorials and documentation, though there are some things I'm having trouble figuring out how to do (or even if it's possible to do).
>> 
>> In particular at the moment, I have the following issue -- which has been hard to search for solutions to, since the associated keywords are common to other questions and issues.
>> 
>> I have a file with columns of data which I would like to plot -- which is simple enough.
>> However, one of the columns is an index, which denotes which data-set the line belongs to.
>> (The lines are all in one long mixed group -- there are no sections or extra newlines.)
>> 
>> I would like to create a separate graph for each index in the file.
>> 
>> I found in the documentation[1] how to use the ternary operator to omit values based on column values, but this approach has several problems.
>> 
>> First, the documentation recommends setting points to undefined (1/0), which means that if I'm plotting "with linespoints", then any time there are consecutive lines in the file which have different indices, there is a break in the graph.
>> 
>> Second, it seems that I would need to know all of the indices in the file before running gnuplot on it, so that I could tell it to plot each of the different indices. (Using a loop perhaps, but I'd still need to know them all beforehand.)
>> 
>> One solution is to simply write a simple (eg. Python) script to parse the data file beforehand to sort/reformat it, break it into multiple files or sections, or something like that. Then it could create gnuplot code to hand it off to.
>> 
>> However, I would like to know if I can accomplish this using only gnuplot, for an arbitrary file.
>> 
>> Thank you so much!
>> -Yub
>> 
>> 
>
>so far i understand you have a file with a index,value pair like that:
>
>0       73      0       25      0       124302  000000.003107550
>0       74      0       28      0       150160  000000.003754000
>0       75      0       39      0       244268  000000.006106700
>0       76      1       87      0       259467  000000.006486675
>0       77      0       149     0       259537  000000.006488425
>0       78      0       32      0       268263  000000.006706575
>0       79      1       282     0       281296  000000.007032400
>0       80      0       481     0       281366  000000.007034150
>0       81      0       13      1       36992   000000.010924800
>0       82      1       134     1       56228   000000.011405700
>0       83      0       228     1       56298   000000.011407450
>0       84      1       100     1       77730   000000.011943250
>0       85      0       171     1       77800   000000.011945000
>0       86      0       115     1       77981   000000.011949525
>0       87      1       34      1       275359  000000.016883975
>
>lets assume that column 3 is your index and column 7 is you value.
>I am not sure if gnuplot is intended to do such filtering. So i use
>awk for that, i found it very flexible an easy to use and less fat
>than certain other languages.
>
>awk '{ print $7 >>$3 }' [your file here]
>
>This would generate a file called 1 and a second called 0 feel free to ajust to you needs.
>You can run that script from inside gnuplot also by using
>
>plot "<awk '{ if ($3==0) print $7 }' " but this would require a recalculation everytime
>you want a plot.
>
>
>re,
>wh
>
>
>