|---| | [ View source on GitHub](https://github.com/tensorflow/probability/blob/v0.25.0/tensorflow_probability/python/math/special.py#L1615-L1640) | Computes the inverse to [`tf.math.igammac`](https://www.tensorflow.org/api_docs/python/tf/math/igammac) with respect to `p`. tfp.math.igammacinv( a, p, name=None ) ### Used in the notebooks | Used in the tutorials | |---| | - [TFP Release Notes notebook (0.13.0)](https://www.tensorflow.org/probability/examples/TFP_Release_Notebook_0_13_0) | This function is defined as the solution `x` to the equation `p = tf.math.igammac(a, x)`. # References \[1\] A. Didonato and A. Morris, Computation of the Incomplete Gamma Function Ratios and their Inverse


| ## Args || |---|---| | `a` | A positive `float` `Tensor`. Must be broadcastable with `p`. | | `p` | A `float` `Tensor` whose entries lie in `[0, 1]`. Must be broadcastable with `a`. | | `name` | Optional Python `str` naming the operation. |



| ## Returns || |---|---| | `igammacinv` | igammacinv(a, p). Has same type as `a`. |