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documented another method of generating a self-plotting data file

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Dima Kogan 2011-02-04 20:41:32 -08:00
parent 17beddeb9e
commit fffc156a09
2 changed files with 88 additions and 4 deletions
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46
README.pod
View File

@ -129,8 +129,12 @@ B<.png> currently supported.
=head2 Self-plotting data files
This script can be used to create self-plotting data files. A self-plotting,
executable data file C<data> is formatted as
This script can be used to enable self-plotting data files. There are 2 ways of
doing this: with a shebang (#!) or with inline perl data.
=head3 Self-plotting data with a #!
A self-plotting, executable data file C<data> is formatted as
$ cat data
#!/usr/bin/feedGnuplot --lines --points
@ -160,6 +164,44 @@ and that the full path to feedGnuplot must be given. The 127 character limit is
a serious limitation, but this can likely be resolved with a kernel patch. I
have only tried on Linux 2.6.
=head3 Self-plotting data with perl inline data
Perl supports storing data and code in the same file. This can also be used to
create self-plotting files:
$ cat plotdata.pl
#!/usr/bin/perl
use strict;
use warnings;
open PLOT, "| feedGnuplot --lines --points" or die "Couldn't open plotting pipe";
while( <DATA> )
{
my @xy = split;
print PLOT "@xy\n";
}
__DATA__
2 1
4 4
6 9
8 16
10 25
12 36
14 49
16 64
18 81
20 100
22 121
24 144
26 169
28 196
30 225
This is especially useful if the logged data is not in a format directly
supported by feedGnuplot. Raw data can be stored after the __DATA__ directive,
with a small perl script to manipulate the data into a useable format and send
it to the plotter.
=head2 Further help
All the options are described with

46
bin/feedGnuplot
View File

@ -793,8 +793,12 @@ B<.png> currently supported.
=head2 Self-plotting data files
This script can be used to create self-plotting data files. A self-plotting,
executable data file C<data> is formatted as
This script can be used to enable self-plotting data files. There are 2 ways of
doing this: with a shebang (#!) or with inline perl data.
=head3 Self-plotting data with a #!
A self-plotting, executable data file C<data> is formatted as
$ cat data
#!/usr/bin/feedGnuplot --lines --points
@ -824,6 +828,44 @@ and that the full path to feedGnuplot must be given. The 127 character limit is
a serious limitation, but this can likely be resolved with a kernel patch. I
have only tried on Linux 2.6.
=head3 Self-plotting data with perl inline data
Perl supports storing data and code in the same file. This can also be used to
create self-plotting files:
$ cat plotdata.pl
#!/usr/bin/perl
use strict;
use warnings;
open PLOT, "| feedGnuplot --lines --points" or die "Couldn't open plotting pipe";
while( <DATA> )
{
my @xy = split;
print PLOT "@xy\n";
}
__DATA__
2 1
4 4
6 9
8 16
10 25
12 36
14 49
16 64
18 81
20 100
22 121
24 144
26 169
28 196
30 225
This is especially useful if the logged data is not in a format directly
supported by feedGnuplot. Raw data can be stored after the __DATA__ directive,
with a small perl script to manipulate the data into a useable format and send
it to the plotter.
=head2 Further help
All the options are described with