# Python Stupid numpy.piecewise

## #Python

Python Stupid numpy.piecewise

The `piecewise()`

function in numpy is not very good. Due to the writing of the function, one wouldn’t be surprised to encounter the following error,

```
if (n != n2):
raise ValueError(
"function list and condition list must be the same")
```

in which `n`

is the length of condition list and `n2`

is the length of function list.

To avoid it, the input should always be prepared as following

```
x = np.asarray(x)
# The following is important to avoid the weird behavior of piecewise()
if not x.shape:
x = np.asarray([x])
```

Published:
by Lei Ma;

Lei Ma (2015). 'Python Stupid numpy.piecewise', Datumorphism, 12 April. Available at: https://datumorphism.leima.is/til/programming/python/python-stupid-numpy-piecewise/.

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