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List:       gnuplot-info
Subject:    Re: [Gnuplot-info] Print y-values at (local) extremes
From:       Thomas Sefzick <t.sefzick () fz-juelich ! de>
Date:       2009-10-19 7:15:44
Message-ID: 25954123.post () talk ! nabble ! com
[Download RAW message or body]


try this with gnuplot 4.3-cvs:

set xrange [0:11]
set yrange [3:12]
up=0
plot 'datafilename' with linespoints, \
'' using ($0==0?x1=x2=$1:($0==1?($2>=y1?up=1:up=0):0,x1=x2)):\
         ($0==0?y1=y2=$2:y1=y2):\
         ($0==0?0/0:0 , x2=$1 , y2=$2 , \
          up==1?($2-y1<0?(up=0,sprintf("%d",y1)):0/0) \
               :($2-y1>0?(up=1,0/0):0/0)) \
   with labels offset 0,1 notitle , \
'' using ($0==0?x1=x2=$1:($0==1?($2>=y1?up=1:up=0):0,x1=x2)):\
         ($0==0?y1=y2=$2:y1=y2):\
         ($0==0?0/0:0 , x2=$1 , y2=$2 , \
          up==1?($2-y1<0?(up=0,0/0):0/0) \
               :($2-y1>0?(up=1,sprintf("%d",y1)):0/0)) \
   with labels offset 0,-1 notitle


LukasP wrote:
> 
> Hello,
> 
> is there a way GNUplot to write y-values at places where the y-value is a
> (local) extreme?
> 
> - Let's have a datafile with x and y values:
> 
> # x y
> 1 5
> 2 6
> 3 8
> 4 4
> 8 11
> 10 10
> 
> Than the y(x) plot of these data will have local maximum at [2; 6] and [8;
> 11] and the local minimum at [4; 4].
> 
> And I'm looking for a way that GNUplot would write "6" and "11" above
> points of local maximums and "4" above the local minimum.
> 
> Is it possible somehow?
> 
> - I know special cases should be solved - e.g. data:
> 
> 0 5
> 2 6
> 3 6
> 4 6
> 5 2
> 
> It should be decided whether the [2; 6], [3; 6] and/or [4; 6] are extremes
> as well; but this is not the main question.
> 
> Or, is it possible the datafile to contain a special mark at points where
> the y-values are wanted to be written? E.g.:
> 
> # x y
> 1 5
> 2 6
> 3 8 # y
> 4 4 # Y
> 8 11 # y
> 10 10
> 
> Which should mean: when plotting - "# y" => "write the y-value above", "#
> Y" => "write the y-value bellow"?
> 
> See also the attachment for the wanted effect.
> 
> Thank you in advance.
> 
> Lukas
> http://www.nabble.com/file/p25925173/Clipboard01.png Clipboard01.png 
> 

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