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how to reference same data set in script twice?

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  how to reference same data set in script twice? thomas.lehmann.private@googlemail.com - 2015-07-03 23:13 -0700
    Re: how to reference same data set in script twice? Karl-Friedrich Ratzsch <mail.kfr@gmx.net> - 2015-07-05 02:23 +0200
      Re: how to reference same data set in script twice? Ethan A Merritt <EAMerritt@gmail.com> - 2015-07-07 07:43 -0700
        Re: how to reference same data set in script twice? Karl Ratzsch <mail.kfr@gmx.net> - 2015-07-07 18:24 +0200

#2965 — how to reference same data set in script twice?

Hi,

what I'm looking for is an elegant way to reference same
data twice (no file). I have a Python wrapper for plots and
the final script which result looks like (see bottom) ...

In this case we have two data sets. But how to do it when
I would like reference same data set twice without duplicating
the data set? (example: using for fit or displaying same data
with bars instead of lines - multiplot -  or displaying modified
by a function ... there are plenty of variants)

One great solution would be if I could give a
data set a name. Possible? (again: no file wanted)

[code]
cat example.gp
#!/usr/bin/gnuplot
set terminal gif size 640, 480
set output "/tmp/example.gp.gif"
# displaying a plot title
set title "simple example"
# enables displaying a grid
set grid
# plotting values
plot\
    "-" with lines ls 1 title "first curve",\
    "-" with lines ls 2 title "second curve"
1 0
2 1
3 0
4 2
EOF
1 3
2 0
3 2
4 1
EOF
[/code]

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#2966

Am 04.07.2015 um 08:13 schrieb thomas.lehmann.private@googlemail.com:
> Hi,
> 
> what I'm looking for is an elegant way to reference same
> data twice (no file). I have a Python wrapper for plots and
> the final script which result looks like (see bottom) ...

Very simple if you have gp version > 5.0

set table $data
plot "-"
unset table
fit ... $data ...
plot $data, ...

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#2967

Karl-Friedrich Ratzsch wrote:

> Am 04.07.2015 um 08:13 schrieb thomas.lehmann.private@googlemail.com:
>> Hi,
>> 
>> what I'm looking for is an elegant way to reference same
>> data twice (no file). I have a Python wrapper for plots and
>> the final script which result looks like (see bottom) ...
> 
> Very simple if you have gp version > 5.0
> 
> set table $data
> plot "-"
> unset table
> fit ... $data ...
> plot $data, ...

I wouldn't recommend that, since the tabling operation
only preserves some of the information in the original
input stream.  Much better is to use the version 5
"Here Document" method:


$DATA_1 << EOD
1 2 3 # first line of data
3 4 5 8 9 
EOD

$DATA_2 << EOD
5 6 7
8 9 0
EOD

plot $DATA_1 using 1:2, $DATA_1 using 1:3, $DATA_2

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#2968

Am 07.07.2015 um 16:43 schrieb Ethan A Merritt:
> Karl-Friedrich Ratzsch wrote:
> 
>> Am 04.07.2015 um 08:13 schrieb thomas.lehmann.private@googlemail.com:
>>> Hi,
>>>
>>> what I'm looking for is an elegant way to reference same
>>> data twice (no file). I have a Python wrapper for plots and
>>> the final script which result looks like (see bottom) ...
>>
>> Very simple if you have gp version > 5.0
>>
>> set table $data
>> plot "-"
>> unset table
>> fit ... $data ...
>> plot $data, ...
> 
> I wouldn't recommend that, since the tabling operation
> only preserves some of the information in the original
> input stream.  Much better is to use the version 5
> "Here Document" method:
> 
> 
> $DATA_1 << EOD
> 1 2 3 # first line of data
> 3 4 5 8 9 
> EOD
> 
> $DATA_2 << EOD
> 5 6 7
> 8 9 0
> EOD
> 
> plot $DATA_1 using 1:2, $DATA_1 using 1:3, $DATA_2
> 

That's right. If you already have a Python wrapper, there's no need to
use table mode for filling $DATA. Definitely more elegant.

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