Module Gnuplot
In: lib/gnuplot.rb
Plot SPlot DataSet lib/gnuplot.rb Gnuplot dot/m_0_0.png

Methods

gnuplot   open   which  

Classes and Modules

Class Gnuplot::DataSet
Class Gnuplot::Plot
Class Gnuplot::SPlot

Public Class methods

Find the path to the gnuplot executable. The name of the executable can be specified using the RB_GNUPLOT environment variable but will default to the command ‘gnuplot’.

persist [bool] Add the persist flag to the gnuplot executable

Return the path to the gnuplot executable or nil if one cannot be found.

[Source]

    # File lib/gnuplot.rb, line 43
43:   def Gnuplot.gnuplot( persist = true )
44:     cmd = which( ENV['RB_GNUPLOT'] || 'gnuplot' )
45:     cmd += " -persist" if persist
46:     cmd
47:   end

Open a gnuplot process that exists in the current PATH. If the persist flag is true then the -persist flag is added to the command line. The path to the gnuplot executable is determined using the ‘which’ command.

See the gnuplot documentation for information on the persist flag.

todo Add a method to pass the gnuplot path to the function.

[Source]

    # File lib/gnuplot.rb, line 57
57:   def Gnuplot.open( persist=true )
58:     cmd = Gnuplot.gnuplot( persist ) or raise 'gnuplot not found'
59:     IO::popen( cmd, "w") { |io| yield io }
60:   end

Trivial implementation of the which command that uses the PATH environment variable to attempt to find the given application. The application must be executable and reside in one of the directories in the PATH environment to be found. The first match that is found will be returned.

bin [String] The name of the executable to search for.

Return the full path to the first match or nil if no match is found.

[Source]

    # File lib/gnuplot.rb, line 19
19:   def Gnuplot.which ( bin )
20:     return bin if File::executable? bin
21: 
22:     path = ENV['PATH'] # || ENV['WHAT_EVER_WINDOWS_PATH_VAR_IS']
23:     path.split(File::PATH_SEPARATOR).each do |dir|
24:       candidate = File::join dir, bin.strip
25:       return candidate if File::executable? candidate
26:     end
27: 
28:     # This is an implementation that works when the which command is
29:     # available.
30:     # 
31:     # IO.popen("which #{bin}") { |io| return io.readline.chomp }
32: 
33:     return nil
34:   end

[Validate]