====== GNUplot ======

===== Links =====

  * [[http://gnuplot.sourceforge.net/demo/|Demo scripts for gnuplot]]: completo :-D
  * [[http://t16web.lanl.gov/Kawano/gnuplot/gallery/index-e.html|not so Frequently Asked Questions]]: outdated :-)

===== Data como eixo =====

<code>
> #Date,Open,High,Low,Close,Volume,Adj Close
> 2008-10-06,10322.52,10322.52,9503.10,9955.50,7956020000,9955.50
> 2008-10-03,10483.96,10844.69,10261.75,10325.38,6716120000,10325.38
> 2008-10-02,10825.54,10843.10,10368.08,10482.85,6285640000,10482.85
> 2008-10-01,10847.40,11022.06,10495.99,10831.07,5782130000,10831.07

set xdata time
set timefmt "%Y-%m-%d"
set format x"%Y-%m-%d"
set xtics rotate by -45 
set datafile separator ","
plot 'data' using 1:2:4:3:5 with candlesticks notitle
</code>

<plot>
set xdata time 
set timefmt "%Y-%m-%d"
set format x"%d-%m-%Y"
set xtics rotate by -30
set datafile separator ","
plot 'src:/dicas/dados-data.txt'  using 1:2:4:3:5 with candlesticks notitle
</plot>

===== Binagem =====

<code>
binit(binmin,bin,x) = binmin+bin*(0.5+int((x-binmin)/bin))
isinside(binmin,x,binmax)=x<binmin|x>binmax? 0:1
plot 'data' using (binit(0.0,0.1,$1)):(isinside(0.0,$1,1.0)) \\
            smooth frequency with step
</code>

it's a bit tricky to understand... I admit the key is to use the "smooth frequency" key
from "help frequency". The `frequency` option makes the data monotonic in x; points with the same  x-value are replaced by a single point having the summed y-values. The resulting points are then connected by straight line segments.