[Numpy-discussion] object dtype questions
Ernest Adrogué
eadrogue@gmx....
Sun Sep 6 06:32:52 CDT 2009
5/09/09 @ 11:22 (-0600), thus spake Mark Wendell:
> For example:
>
> Say that C is a simple python class with a couple attributes and methods.
>
> a = np.empty( (5,5), dtype=object)
> for i in range(5):
> for j in range(5):
> a[i,j] = C(var1,var2)
>
> First question: is there a quicker way than above to create unique
> instances of C for each element of a?
You achieve the same with
a=np.array([C(var1, var2) for i in range(25)], dtype=object).reshape((5,5))
but it takes about the same time in my computer.
> for i in range(5):
> for j in range(5):
> a[i,j].myMethod(var3,var4)
> print a[i,j].attribute1
>
> Again, is there a quicker way than above to call myMethod or access attribute1?
I think you can use a ufunc:
def foo(x):
x.myMethod(var3,var4)
print x.attribute1
ufoo = np.frompyfunc(foo, 1, 0)
ufoo(a)
Don't know if it is any faster though.
--
Ernest
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