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require File.expand_path('../../../spec_helper', __FILE__)
require 'matrix'
describe "Matrix#column" do
before :all do
@m = Matrix[[1,2,3], [2,3,4]]
end
it "returns a Vector when called without a block" do
@m.column(1).should == Vector[2,3]
end
it "yields each element in the column to the block" do
a = []
@m.column(1) {|n| a << n }
a.should == [2,3]
end
it "counts backwards for negative argument" do
@m.column(-1).should == Vector[3, 4]
end
it "returns self when called with a block" do
@m.column(0) { |x| x }.should equal(@m)
end
it "returns nil when out of bounds" do
@m.column(3).should == nil
end
it "never yields when out of bounds" do
lambda { @m.column(3){ raise } }.should_not raise_error
lambda { @m.column(-4){ raise } }.should_not raise_error
end
end
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