我们从Python开源项目中,提取了以下2个代码示例,用于说明如何使用math.expm1()。
def expm1(node): return merge([node], math.expm1)
def test_one(): from math import sin, cos, tan, asin, acos, atan from math import sinh, cosh, tanh, asinh, acosh, atanh from math import exp, expm1, log, log10, log1p, sqrt, lgamma from math import fabs, ceil, floor, trunc, erf, erfc try: from math import log2 except ImportError: def log2(x): return log(x) / log(2) def wrapper(f, v): try: return f(v) except ValueError: if f == sqrt: return float('nan') if v >= 0: return float('inf') else: return -float('inf') def compare(a, b): if isfinite(a) and isfinite(b): return assert_almost_equals(a, b) return str(a) == str(b) for f in [sin, cos, tan, asin, acos, atan, sinh, cosh, tanh, asinh, acosh, atanh, exp, expm1, log, log2, log10, log1p, sqrt, lgamma, fabs, ceil, floor, trunc, erf, erfc]: for p in [0.5, 1]: a = random_lst(p=p) b = SparseArray.fromlist(a) c = getattr(b, f.__name__)() res = [wrapper(f, x) for x in a] index = [k for k, v in enumerate(res) if v != 0] res = [x for x in res if x != 0] print(f, p, c.non_zero, len(res)) assert c.non_zero == len(res) [assert_almost_equals(v, w) for v, w in zip(index, c.index)] [compare(v, w) for v, w in zip(res, c.data)]