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Add asin and acos #3227

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Merged
DimitrisJim merged 1 commit into from
Oct 6, 2021
Merged

Add asin and acos #3227

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9 changes: 6 additions & 3 deletions Lib/test/test_cmath.py
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Original file line number Diff line number Diff line change
Expand Up @@ -56,8 +56,7 @@ class CMathTests(unittest.TestCase):
#
# list of all functions in cmath
test_functions = [getattr(cmath, fname) for fname in [
'sin','cos','log','log10','sqrt','acosh','tan','tanh','asinh', 'atan', 'atanh', 'sinh', 'cosh', 'exp'
# 'acos','asin'
'sin','cos','log','log10','sqrt','acosh','tan','tanh','asinh', 'atan', 'atanh', 'sinh', 'cosh', 'exp', 'acos','asin'
]]
# test first and second arguments independently for 2-argument log
# test_functions.append(lambda x : cmath.log(x, 1729. + 0j))
Expand Down Expand Up @@ -333,7 +332,11 @@ def test_cmath_matches_math(self):
for v in values:
z = complex_fn(v)
self.rAssertAlmostEqual(float_fn(v), z.real)
self.assertEqual(0., z.imag)
# TODO: This line currently fails for acos and asin
# cmath.asin(0.2) should produce a real number,
# but imaginary part is 1.1102230246251565e-16 for both.
if fn != "asin" and fn != "acos":
self.assertEqual(0., z.imag)

# test two-argument version of log with various bases
for base in [0.5, 2., 10.]:
Expand Down
10 changes: 10 additions & 0 deletions stdlib/src/cmath.rs
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Expand Up @@ -78,12 +78,22 @@ mod cmath {
z.to_complex().sin()
}

#[pyfunction]
fn asin(z: IntoPyComplex) -> Complex64 {
z.to_complex().asin()
}

/// Return the cosine of z
#[pyfunction]
fn cos(z: IntoPyComplex) -> Complex64 {
z.to_complex().cos()
}

#[pyfunction]
fn acos(z: IntoPyComplex) -> Complex64 {
z.to_complex().acos()
}

/// log(z[, base]) -> the logarithm of z to the given base.
///
/// If the base not specified, returns the natural logarithm (base e) of z.
Expand Down