Animation_nodes: Why numpy code is so slow?

[kdsin23]

it is said that the numpy is much faster than python,but why not in this script:

Obviously,the python code is ten times faster than numpy code,what is wrong?

[OmarEmaraDev]

To get a numpy array from a Vector List, you can use the asNumpyArray method. To get a Color List from a numpy array, you can use the fromNumpyArray method. This should reduce the python overhead significantly.

[harisreedhar]

To get a numpy array from a Vector List, you can use the asNumpyArray method. To get a Color List from a numpy array, you can use the fromNumpyArray method. This should reduce the python overhead significantly.

Is asNumpyArray method of Vector3DList ?

[OmarEmaraDev]

@harisreedhar Yes, all numeric lists in Animation Nodes have an asNumpyArray method. Similarly, All numeric list classes have a fromNumpyArray class method.

[harisreedhar]

@harisreedhar Yes, all numeric lists in Animation Nodes have an asNumpyArray method. Similarly, All numeric list classes have a fromNumpyArray class method.

Thanks, Is there any way to know available functions of class?

[OmarEmaraDev]

@harisreedhar If you mean in python in general, you can use the dir function, which will return a list of the names of all the methods and attributes of an object. For instance:

>>> a = [1, 2, 3]
>>> dir(a)
['sort', 'reverse', 'remove', 'pop', 'insert', 'index', 'extend', 'count', 'copy', 'clear', 'append', '__subclasshook__', '__str__', '__sizeof__', '__setitem__', '__setattr__', '__rmul__', '__reversed__', '__repr__', '__reduce_ex__', '__reduce__', '__new__', '__ne__', '__mul__', '__lt__', '__len__', '__le__', '__iter__', '__init_subclass__', '__init__', '__imul__', '__iadd__', '__hash__', '__gt__', '__getitem__', '__getattribute__', '__ge__', '__format__', '__eq__', '__doc__', '__dir__', '__delitem__', '__delattr__', '__contains__', '__class__', '__add__']

[harisreedhar]

@harisreedhar If you mean in python in general, you can use the dir function, which will return a list of the names of all the methods and attributes of an object. For instance:

>>> a = [1, 2, 3]
>>> dir(a)
['sort', 'reverse', 'remove', 'pop', 'insert', 'index', 'extend', 'count', 'copy', 'clear', 'append', '__subclasshook__', '__str__', '__sizeof__', '__setitem__', '__setattr__', '__rmul__', '__reversed__', '__repr__', '__reduce_ex__', '__reduce__', '__new__', '__ne__', '__mul__', '__lt__', '__len__', '__le__', '__iter__', '__init_subclass__', '__init__', '__imul__', '__iadd__', '__hash__', '__gt__', '__getitem__', '__getattribute__', '__ge__', '__format__', '__eq__', '__doc__', '__dir__', '__delitem__', '__delattr__', '__contains__', '__class__', '__add__']

Thank you

[kdsin23]

To get a numpy array from a Vector List, you can use the asNumpyArray method. To get a Color List from a numpy array, you can use the fromNumpyArray method. This should reduce the python overhead significantly.

Thank you very much! does the "GenericList " have the asNumpyArraymethod?

[OmarEmaraDev]

GenericList is a python lists, not a CList, so no.

[kdsin23]

GenericList is a python lists, not a CList, so no.

much appreciate! another question is that can we write a Numpy array in .pyx file like this:

cdef nd.array array_b = Vector3DList.asNumpyArray(vectors)

or how can we cdef a numpy array in the cython?
thank you!

[OmarEmaraDev]

@kdsin23 Read the Cython documentation on the topic:
https://cython.readthedocs.io/en/latest/src/tutorial/numpy.html

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