nlcpy.arccos

nlcpy.arccos = <ufunc 'nlcpy_arccos'>

Computes the element-wise inverse cosine.

The inverse of cos so that, if y = cos(x), then x = arccos(y).

Parameters

xarray_like

outndarray or 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 default out=None, locations within it where the condition is False will remain uninitialized.

**kwargs

For other keyword-only arguments, see the section Optional Keyword Arguments.

Returns

yndarray

The inverse cosine values for each element of x. If x is a scalar, this function returns the result as a 0-dimension ndarray.

参考

cos

Computes the element-wise cosine.

arcsin

Computes the element-wise inverse sine.

arctan

Computes the element-wise inverse tangent.

arctan2

Computes the element-wise inverse tangent of x1/x2 choosing the quadrant correctly.

Examples

>>> import nlcpy as vp
>>> vp.arccos([1, -1])
array([0.        , 3.14159265])