# Python math.expm1() Examples

The following are code examples for showing how to use math.expm1(). They are extracted from open source Python projects. You can vote up the examples you like or vote down the ones you don't like. You can also save this page to your account.

Example 1
 Project: hyper-engine   Author: maxim5   File: sugar.py    (license) View Source Project 5 votes  `def expm1(node): return merge([node], math.expm1) `
Example 2
 Project: SparseArray   Author: INGEOTEC   File: test_sparse_array.py    (license) View Source Project 4 votes  ```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)] ```