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Re: How to know total number of blocks in a file?

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From	sfeam <sfeam@users.sourceforge.net>
Newsgroups	comp.graphics.apps.gnuplot
Subject	Re: How to know total number of blocks in a file?
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Date	Thu, 15 Mar 2012 11:34:12 -0700
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sfeam wrote:

> ampbox@gmail.com wrote:
> 
>> Hi all,
>> 
>> I have a data file with multiple data blocks (groups of data lines
>> separated by blank lines). I want to plot only the last block.
>> 
>> I can do it like
>> 
>>       plot 'filename' every :::<blockNO>::<blockNO>
>> 
>> where <blockNO> is the block number, and since it is the last block,
>> this number equals the total number of blocks in my data file.
>> 
>> The problem is, I don't know how many blocks are there in my data
>> file. (Because my simulation adds a new block every few hours and the
>> longer simulation runs, the more number of frames (block) I get.)
>> 
>> Is there a built-in variable like GPVAL_DATA_X_MAX etc. to give me
>> this information?
> 
> Not currently.  There is a contributed patch on the SourceForge
> tracker that claims to add something like this (I haven't looked at it
> so I don't know the details).

I forgot! Now that version 4.6 has been released,there is a
way to do this. In version 4.6 you can use the "stats" command
to find the number of blocks first, and then use that value in 
a subsequent plot command.

gnuplot> stats 'filename' 
gnuplot> print STATS_blocks
gnuplot> plot 'filename' every :::STATS_blocks::STATS_blocks

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How to know total number of blocks in a file? ampbox@gmail.com - 2012-03-15 07:43 -0700
  Re: How to know total number of blocks in a file? sfeam <sfeam@users.sourceforge.net> - 2012-03-15 09:53 -0700
    Re: How to know total number of blocks in a file? sfeam <sfeam@users.sourceforge.net> - 2012-03-15 11:34 -0700

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