LennardJones raises Error when initialized without specified ndim

[mpvanderschelling]

The problem

• The LennardJones Function has a dim_default of 2, but an ValueError is raised when the dimensionality that is given upon construction is nog in `range(6, 61)
• This check is specified right after construction, before setting the default dimensionality. Therefore providing no argument (ndim=None) will raise the ValueError. This is inconsistant with the interface of the other named functions.

opfunu/opfunu/name_based/l_func.py

Line 113 in 092327e

self.dim_default = 2

Minimal reproducible example

from opfunu.name_based.l_func import LennardJones
f = LennardJones(ndim=None)

will raise:

ValueError                                Traceback (most recent call last)
Cell In[13], [line 3](vscode-notebook-cell:?execution_count=13&line=3)
      [1](vscode-notebook-cell:?execution_count=13&line=1) from opfunu.name_based.l_func import LennardJones
----> [3](vscode-notebook-cell:?execution_count=13&line=3) f = LennardJones(ndim=None)

File [~/Documents/GitHub/opfunu/opfunu/name_based/l_func.py:110](https://file+.vscode-resource.vscode-cdn.net/home/martin/Documents/GitHub/opfunu/notebooks/~/Documents/GitHub/opfunu/opfunu/name_based/l_func.py:110), in LennardJones.__init__(self, ndim, bounds)
    [108](https://file+.vscode-resource.vscode-cdn.net/home/martin/Documents/GitHub/opfunu/notebooks/~/Documents/GitHub/opfunu/opfunu/name_based/l_func.py:108) def __init__(self, ndim=None, bounds=None):
    [109](https://file+.vscode-resource.vscode-cdn.net/home/martin/Documents/GitHub/opfunu/notebooks/~/Documents/GitHub/opfunu/opfunu/name_based/l_func.py:109)     if ndim not in range(6, 61):
--> [110](https://file+.vscode-resource.vscode-cdn.net/home/martin/Documents/GitHub/opfunu/notebooks/~/Documents/GitHub/opfunu/opfunu/name_based/l_func.py:110)         raise ValueError("LennardJones dimensions must be in (6, 60)")
    [111](https://file+.vscode-resource.vscode-cdn.net/home/martin/Documents/GitHub/opfunu/notebooks/~/Documents/GitHub/opfunu/opfunu/name_based/l_func.py:111)     super().__init__()
    [112](https://file+.vscode-resource.vscode-cdn.net/home/martin/Documents/GitHub/opfunu/notebooks/~/Documents/GitHub/opfunu/opfunu/name_based/l_func.py:112)     self.dim_changeable = True

ValueError: LennardJones dimensions must be in (6, 60)

[thieu1995]

@mpvanderschelling,

Thank you. I have fixed this problem.