Module: Octave::Io

Defined in:
lib/octave/io.rb,
lib/octave/polyfit.rb

Constant Summary collapse

OCTAVE_EXE = 
'/usr/bin/env octave -q'

Class Method Summary collapse

Class Method Details

.command(command_string) ⇒ Object

Octave::Io.command(command_string)

send a command to Octave in a pipe and return the results. The results are returned as arrays of float values



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# File 'lib/octave/io.rb', line 14

def command(command_string)
  res = []
  decorated_command_string = "echo \"#{command_string}\" | #{OCTAVE_EXE}"
  IO.popen(decorated_command_string) do
    |octave_result|
    out = octave_result.readlines.map { |l| l.chomp }
    out.each { |line| res << line.to_f if line.match?(/\s*\d+/) }
  end
  res
end

.polyfit(x, y, n) ⇒ Object

Octave::Io.polyfit(x, y, n)

get the coefficients of an n-degree polynomial using octave‘s polyfit function



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# File 'lib/octave/polyfit.rb', line 13

def polyfit(x, y, n)
  command_string = "a = polyfit(#{x}, #{y}, #{n}); a'"
  ::Octave::Io.command(command_string)
end