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12 lines
339 B
Ruby
12 lines
339 B
Ruby
require 'matrix'
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describe :trace, shared: true do
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it "returns the sum of diagonal elements in a square Matrix" do
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Matrix[[7,6], [3,9]].trace.should == 16
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end
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it "returns the sum of diagonal elements in a rectangular Matrix" do
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->{ Matrix[[1,2,3], [4,5,6]].trace}.should raise_error(Matrix::ErrDimensionMismatch)
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end
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end
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