scipy.special.chdtri#

scipy.special.chdtri(v, p, out=None) = <ufunc 'chdtri'>#

Inverse to chdtrc with respect to x.

Returns x such that chdtrc(v, x) == p.

Parameters:
varray_like

Degrees of freedom.

parray_like

Probability.

outndarray, optional

Optional output array for the function results.

Returns:
xscalar or ndarray

Value so that the probability a Chi square random variable with v degrees of freedom is greater than x equals p.

See also

chdtrc, chdtr, chdtriv

Notes

chdtri has experimental support for Python Array API Standard compatible backends in addition to NumPy. Please consider testing these features by setting an environment variable SCIPY_ARRAY_API=1 and providing CuPy, PyTorch, JAX, or Dask arrays as array arguments. The following combinations of backend and device (or other capability) are supported.

Library

CPU

GPU

NumPy

n/a

CuPy

n/a

PyTorch

JAX

⚠️ no JIT

Dask

n/a

See Support for the array API standard for more information.

References

Examples

>>> import scipy.special as sc

It inverts chdtrc.

>>> v, p = 1, 0.3
>>> sc.chdtrc(v, sc.chdtri(v, p))
0.3
>>> x = 1
>>> sc.chdtri(v, sc.chdtrc(v, x))
1.0