numpy.tan — NumPy v2.2 Manual (original) (raw)
numpy.tan(x, /, out=None, *, where=True, casting='same_kind', order='K', dtype=None, _subok=True_[, _signature_]) = <ufunc 'tan'>#
Compute tangent element-wise.
Equivalent to np.sin(x)/np.cos(x) element-wise.
Parameters:
xarray_like
Input array.
outndarray, None, or tuple of ndarray and None, optional
A location into which the result is stored. If provided, it must have a shape that the inputs broadcast to. If not provided or None, a freshly-allocated array is returned. A tuple (possible only as a keyword argument) must have length equal to the number of outputs.
wherearray_like, optional
This condition is broadcast over the input. At locations where the condition is True, the out array will be set to the ufunc result. Elsewhere, the out array will retain its original value. Note that if an uninitialized out array is created via the defaultout=None, locations within it where the condition is False will remain uninitialized.
**kwargs
For other keyword-only arguments, see theufunc docs.
Returns:
yndarray
The corresponding tangent values. This is a scalar if x is a scalar.
Notes
If out is provided, the function writes the result into it, and returns a reference to out. (See Examples)
References
M. Abramowitz and I. A. Stegun, Handbook of Mathematical Functions. New York, NY: Dover, 1972.
Examples
import numpy as np from math import pi np.tan(np.array([-pi,pi/2,pi])) array([ 1.22460635e-16, 1.63317787e+16, -1.22460635e-16])
Example of providing the optional output parameter illustrating
that what is returned is a reference to said parameter
out1 = np.array([0], dtype='d') out2 = np.cos([0.1], out1) out2 is out1 True
Example of ValueError due to provision of shape mis-matched
outnp.cos(np.zeros((3,3)),np.zeros((2,2))) Traceback (most recent call last): File "", line 1, in ValueError: operands could not be broadcast together with shapes (3,3) (2,2)