-
numpy.expm1(x[, out]) =
-
Calculate
exp(x) - 1
for all elements in the array.Parameters: x : array_like
Input values.
Returns: out : ndarray
Element-wise exponential minus one:
out = exp(x) - 1
.See also
-
log1p
-
log(1 + x)
, the inverse of expm1.
Notes
This function provides greater precision than
exp(x) - 1
for small values ofx
.Examples
The true value of
exp(1e-10) - 1
is1.00000000005e-10
to about 32 significant digits. This example shows the superiority of expm1 in this case.>>> np.expm1(1e-10) 1.00000000005e-10 >>> np.exp(1e-10) - 1 1.000000082740371e-10
-
numpy.expm1()
2017-01-10 18:13:49
Please login to continue.