Gnuplot¶

Synopsis¶

This operator has no parameter, two inputs (the GNUplot script and the data) and one output (the plot). It launches GNUplot for generating a .PNG image.

Parameters¶

None.

Inputs¶

• the first is the GNUplot script. This script uses a

  @file@<pre> string, that is dynamically replaced with the real name by the script.
  * the second is the data to be plot.
  
  h2. Outputs
  
  1 output: the .PNG image representing the plot.
  
  h2. Shell Code
  
  <pre>
  #!/bin/bash
  
  # this shell uses gnuplot with the script as first input on the data
  # on the second output
  # the @file@ string in the gnuplot script is replaced by the data file.
  
  script=$1; shift
  data=`echo $1 | sed 's/\//\\\\\//g'`; shift
  output=$1; shift
  
  (
      echo "set terminal png" 
      echo "set output '$output'" 
      sed "s/@file@/$data/g" $script
  ) > $script.plot
  
  gnuplot $script.plot
  rm $script.plot
  </pre>
  
  h2. Example
  
  This operator is used plotting the results in the stream [[Data mining complexity]].