1

alpha must be > -1

Package:
scipy
8546
Exception Class:
ValueError

Raise code

``````"""

--------
laguerre : Laguerre polynomial.

"""
if alpha <= -1:
raise ValueError("alpha must be > -1")
if n < 0:
raise ValueError("n must be nonnegative.")

if n == 0:
n1 = n + 1
else:
n1 = n``````
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Ways to fix

2

As the error message clearly says it, the parameter alpha should be greater than -1.

How to reproduce it:

• Install scipy then run the sample code given below.
```\$ pipenv install scipy
```

```\$ pipenv shell
```

```from scipy import spacial
a1 = special.genlaguerre(11,-1)
print(a1)
```

```---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
<ipython-input-2-27b772b67165> in <module>()  1 from scipy import special ----> 2 a1 = special.genlaguerre(11,-1)  3 print(a1)
/usr/local/lib/python3.7/dist-packages/scipy/special/orthogonal.py in genlaguerre(n, alpha, monic)  558 """  559 if alpha <= -1: --> 560 raise ValueError("alpha must be > -1")  561 if n < 0:  562 raise ValueError("n must be nonnegative.")
ValueError: alpha must be > -1
```

Fixed:

```from scipy import special
a1 = special.genlaguerre(11,1)
print(a1)
```
Sep 19, 2021
kellemnegasi 30.0k