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Contents
require File.expand_path(File.dirname(__FILE__)) + '/spec_helper.rb'
describe MPFR, "when rounding number by prec_round" do
before(:all) do
MPFR.set_default_prec(200)
@prec = 100
@args = GenerateNumber.float(1000).map{ |a| MPFR.new(a.to_s) }
end
it "should be rounded up" do
@args.each do |a|
a.prec_round(MPFR::RNDU, @prec).should >= a
end
end
it "should be rounded down" do
@args.each do |a|
a.prec_round(MPFR::RNDD, @prec).should <= a
end
end
it "should be rounded to zero" do
@args.each do |a|
if a > 0
a.prec_round(MPFR::RNDZ, @prec).should <= a
else
a.prec_round(MPFR::RNDZ, @prec).should >= a
end
end
end
it "should be rounded to near number" do
@args.each do |a|
min = [(a - a.prec_round(MPFR::RNDU, @prec)).abs, (a - a.prec_round(MPFR::RNDD, @prec)).abs].min
(a - a.prec_round(MPFR::RNDN, @prec)).abs.should eql min
end
end
it "should be rounded by prec_round!" do
@args.each do |a|
[MPFR::RNDU, MPFR::RNDD, MPFR::RNDN, MPFR::RNDZ, MPFR::RNDA].each do |rnd|
b = a.dup
old_object_id = b.object_id
b.prec_round!(rnd, @prec)
b.should eql a.prec_round(rnd, @prec)
b.object_id.should eql old_object_id
end
end
end
end
Version data entries
7 entries across 7 versions & 1 rubygems