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adding #round to Vector as well as Matrix #802

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adding #round to Vector as well as Matrix #802

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8 changes: 8 additions & 0 deletions lib/matrix.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -1713,6 +1713,7 @@ def ** (other)
# * #norm
# * #normalize
# * #r
# * #round
# * #size
#
# Conversion to other data types:
Expand Down Expand Up @@ -1790,6 +1791,13 @@ def []=(i, v)
alias set_component []=
private :[]=, :set_element, :set_component

# Returns a vector with entries rounded to the given precision
# (see Float#round)
#
def round(ndigits=0)
map{|e| e.round(ndigits)}
end

#
# Returns the number of elements in the vector.
#
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6 changes: 6 additions & 0 deletions test/matrix/test_matrix.rb
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Expand Up @@ -190,6 +190,12 @@ def o.to_ary; [1,2,3]; end
assert_equal(@m1, Matrix[o, [4,5,6]])
end

def test_round
a = Matrix[[1.0111, 2.32320, 3.04343], [4.81, 5.0, 6.997]]
b = Matrix[[1.01, 2.32, 3.04], [4.81, 5.0, 7.0]]
assert_equal(a.round(2), b)
end

def test_rows
assert_equal(@m1, Matrix.rows([[1, 2, 3], [4, 5, 6]]))
end
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4 changes: 4 additions & 0 deletions test/matrix/test_vector.rb
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Expand Up @@ -157,6 +157,10 @@ def test_r
assert_equal(5, Vector[3, 4].r)
end

def test_round
assert_equal(Vector[1.234, 2.345, 3.40].round(2), Vector[1.23, 2.35, 3.4])
end

def test_covector
assert_equal(Matrix[[1,2,3]], @v1.covector)
end
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