/usr/lib/ruby/vendor_ruby/Dobjects/Dvector_extras.rb is in ruby-tioga 1.14-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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module Dobjects
# MathEvaluator enables one to evaluate a simple mathematical expression
# such as "x[0] + cos(x[1])", where the array x is given at each call to
# compute, or "x + y**z", or...
#
# This class acts as a backend for Dvector.compute_formula, to make sure
# that the Math module is included, without the drawback of cluttering
# all Math functions in Dvector, which would admittedly be quite stupid.
class MathEvaluator
include Math
# Creates an evaluator for a formula. +formula+ is the formula. It is
# transformed into a block that takes +argname+ as an argument --
# +argname+ can be whatever you want. +mods+ are the modules you would
# like the formula to include. Math is included by default, but you
# can include other ones to make other kinds of functions available.
#
# MathEvaluator.new("col[0] + col[1]", "col")
# MathEvaluator.new("x*cos(y)", "x,y")
def initialize(formula, argname, mods = [])
for mod in mods
self.extend mod
end
@block = eval "proc { |#{argname}| #{formula} }"
end
# This function does the actual evaluation with the blocks
# given.
#
# e = MathEvaluator.new("x*y", "x,y")
# e.compute(1,2) -> 2
#
# If an exception arises, NaN is returned. Note that compilation
# problems will be caught before ;-)...
def compute(*args)
begin
return compute_unsafe(*args)
rescue
return 0.0/0.0
end
end
# This function does the actual evaluation with the blocks
# given.
#
# e = MathEvaluator.new("x*y", "x,y")
# e.compute(1,2) -> 2
#
# No care is taken to intercept exceptions.
def compute_unsafe(*args)
return @block.call(*args)
end
end
class Dvector
# thanks to Dave MacMahon for from_na and to_na
# Create a Dvector from an NArray.
def Dvector.from_na(na)
_load([1, na.length, na.to_s].pack('CIa*'))
end
# Create an NArray with the same length and contents as +self+.
def to_na
::NArray.to_na(_dump(nil)[5..-1], ::NArray::DFLOAT)
end
def to_dvector
self
end
# Dvector.fancy_read's defaults options. See that function for
# more details
FANCY_READ_DEFAULTS = {
'sep' => /\s+/,
'comments' => /^\s*\#/,
'skip_first' => 0,
'index_col' => false,
'headers' => nil, # not used for now.
'default' => 0.0/0.0, # defaults to NaN
'initial_size' => 5001,
'remove_space' => true ,# removes spaces at the beginning of the lines
}
# This function is a wrapper for #fast_fancy_read that reflects the
# look-and-feel of #old_fancy_read
def Dvector.fancy_read(stream, cols = nil, opts = {}) # :doc:
o = FANCY_READ_DEFAULTS.dup
o.update(opts)
if stream.is_a?(String)
stream = File.open(stream)
end
raise ArgumentError.new("'stream' should have a gets method") unless
stream.respond_to? :gets
o['sep'] = Regexp.new(o['sep']) unless o['sep'].is_a? Regexp
res = Dvector.fast_fancy_read(stream, o)
# Adding the index columns if necessary
if o["index_col"]
res.unshift(Dvector.new(res[0].length) { |i| i})
end
if cols
return cols.map {|i| res[i] }
else
return res
end
end
# This function reads in +stream+ (can an IO object or a String,
# in which case it represents the name of a file to be opened)
# the columns specified by +cols+ and returns them. column 0 is the
# first column. If +cols+ is +nil+, then fancy_read attempts to find
# all the columns in the file, while filling absent data with NaN.
#
# +opts+ is a hash for tuning the behavior of the reading. It can hold
# the following keys:
# 'sep':: the record separator
# 'comments':: a regular expression matching comment lines
# 'skip_first':: how many lines to skip at the beginning of the file,
# 'default':: the value taken for missing elements
# 'index_col':: if set to true, the first column contains the
# indices of the elements (starting from 0 for
# first and so on)
def Dvector.old_fancy_read(stream, cols = nil, opts = {}) # :doc:
# first, we turn the stream into a real IO stream
if stream.is_a?(String)
stream = File.open(stream)
end
raise ArgumentError.new("'stream' should have a gets method") unless
stream.respond_to? :gets
# we take default options and override them with opts
o = FANCY_READ_DEFAULTS.merge(opts)
# strip off the first lines.
while o["skip_first"] > 0
stream.gets
o["skip_first"] -= 1
end
# then, parsing the lines. We store the results in an array. We read up
# all columns, regardless of what is asked (it doesn't slow that much
# the process -- or does it ?)
columns = []
line_number = 0 # the number of the significant lines read so far
while line = stream.gets
next if line =~ o["comments"]
next if line =~ /^\s*$/ # skip empty lines
if o["remove_space"]
line.gsub!(/^\s+/,'')
end
elements = line.split(o["sep"])
# now, the fun: the actual reading.
# we first turn this elements into floats:
numbers = elements.collect do |s|
begin
a = Float(s)
rescue
o["default"]
end
end
if numbers.size < columns.size
# we pad it with default values
while numbers.size < columns.size
numbers << o["default"]
end
else
# in that case, we need to create new Dvectors to match the
# size of numbers
while columns.size < numbers.size
columns << Dvector.new(line_number, o["default"])
end
end
# now, we should have the same number of elements both
# in numbers and in columns
columns.size.times do |i|
columns[i] << numbers[i]
end
# and it's done ;-) !
line_number += 1
end
# Adding the index columns if necessary
if o["index_col"]
columns.unshift(Dvector.new(columns[0].length) { |i| i})
end
return columns unless cols
return cols.collect { |i|
columns[i]
}
end
# This function is a rudimentary formula computing stuff. Give it
# a text _formula_ and an array of Dvectors (_a_), and it returns a
# Dvector with the result. The formula should contain the following;
# column[n]:: represents the current element of the n th
# Dvector of the array
#
# This is just a try, and should be implemented in C rather than in
# Ruby. But if you're looking for simplicity, here you go ;-) !
#
# _modules_ are the modules you would wish the evaluator to +include+.
# This feature enables one to make sure custom functions are included
def Dvector.compute_formula(formula, a, modules = []) # :doc:
evaluator = MathEvaluator.new(formula, "column", modules)
# if we reach this place, it means that there a no big syntax errors ;-)
# we now need to inspect the array given, and make sure that there is
# and transform it into a clean stuff (an array with only Dvectors and
# nil elements).
target = []
last = nil
a.each { |elem|
if elem.is_a? Dvector
target << elem
last = elem
else
target << nil
end
}
raise "No Dvector found" unless last
# we check all the vectors have the same length
target.each {|x|
if x && x.length != last.length
raise "Dvectors should have all the same length !"
end
}
res = Dvector.new
last.each_index { |i|
args = target.collect { |val|
if val
val[i]
else
nil
end
}
# we add the index at the beginning:
# args.unshift(i)
# Commented out for simplicity
# then we call the block:
elem = evaluator.compute(args)
res << elem
}
return res
end
WRITE_DEFAULTS = {
'sep' => "\t",
'write_mode' => "a",
}
# Writes an array of Dvectors into a text _file_
def Dvector.write(file, cols, options = {})
ops = WRITE_DEFAULTS.update(options)
if file.is_a?(String)
file = File.open(file, ops["write_mode"])
end
nb = cols.map {|d| d.size}.max # The number of lines
nb.times do |i|
file.puts(cols.map {|d| d[i].to_s }.join(ops["sep"]))
end
end
end
end
# Modified by Vincent Fourmond to have a nice Dvector module
# instead of the Tioga module.
# add arithmetic operators for Float and Fixnum with Dvec
class Array # :nodoc: all
def to_dvector
Dobjects::Dvector[*self]
end
end
class Float # :nodoc: all
alias :pre_dvec_add :+
def +(a)
if a.class == Dobjects::Dvector
a+self
else
pre_dvec_add(a)
end
end
alias :pre_dvec_sub :-
def -(a)
if a.class == Dobjects::Dvector
a.neg+self
else
pre_dvec_sub(a)
end
end
alias :pre_dvec_mult :*
def *(a)
if a.class == Dobjects::Dvector
a*self
else
pre_dvec_mult(a)
end
end
alias :pre_dvec_div :/
def /(a)
if a.class == Dobjects::Dvector
a.inv*self
else
pre_dvec_div(a)
end
end
alias :pre_dvec_pow :**
def **(a)
if a.class == Dobjects::Dvector
a.as_exponent_of(self)
else
pre_dvec_pow(a)
end
end
end
class Fixnum # :nodoc: all
alias :pre_dvec_add :+
def +(a)
if a.class == Dobjects::Dvector
a+self
else
pre_dvec_add(a)
end
end
alias :pre_dvec_sub :-
def -(a)
if a.class == Dobjects::Dvector
a.neg+self
else
pre_dvec_sub(a)
end
end
alias :pre_dvec_mult :*
def *(a)
if a.class == Dobjects::Dvector
a*self
else
pre_dvec_mult(a)
end
end
alias :pre_dvec_div :/
def /(a)
if a.class == Dobjects::Dvector
a.inv*self
else
pre_dvec_div(a)
end
end
alias :pre_dvec_pow :**
def **(a)
if a.class == Dobjects::Dvector
a.as_exponent_of(self)
else
pre_dvec_pow(a)
end
end
end
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