gnuplot-info

[Gnuplot-info] Help - Peak of a graph

[eros69 <osa...@go...>]

is it possibly to find peak(y-highest) of an xy-graph and output the
corresponding x-value to a file? i mostly output all xy values to a file
then go manually thru the file to identify the y-highest. this files are
very big, please help.
thanks
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Re: [Gnuplot-info] Help - Peak of a graph

[<as...@ca...>]

Hi,

I don't know if it can be done in gnuplot. You could try by using
sort: suppose your file has 2 columns separated by spaces:

x-value y-value

 In that case,

$ sort -t' ' -k2,2n yourfile.dat | head -1

this would give you the line corresponding to your peak.
Take a look at 'man sort' for further information.

Hern=E1n

On 4/18/07, eros69 <osa...@go...> wrote:
>
> is it possibly to find peak(y-highest) of an xy-graph and output the
> corresponding x-value to a file? i mostly output all xy values to a file
> then go manually thru the file to identify the y-highest. this files are
> very big, please help.
> thanks
> --
> View this message in context: http://www.nabble.com/Help---Peak-of-a-grap=
h-tf3604344.html#a10070103
> Sent from the Gnuplot - User mailing list archive at Nabble.com.
>
>
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--=20
---------------------------------------------
Mg.  Hern=E1n  Gonzalo  Asorey
Instituto Balseiro - CAB
(8400) San Carlos de Bariloche
R=EDo Negro  - Rep. Argentina
---------------------------------------------
cabtep5.cnea.gov.ar/~asoreyh/

Re: [Gnuplot-info] Help - Peak of a graph

[<HBB...@t-...>]

eros69 wrote:
> is it possibly to find peak(y-highest) of an xy-graph and output the
> corresponding x-value to a file? 

Yes, but gnuplot is the wrong tool for that job.  Any scripting language 
or proper maths package (octave, e.g.) would be better.