Finding the number of elements in the first index of the array given (Python)

Question

I'm currently working on a HC single linkage method in Python and when I'm cluster each element I'm storing the current clusters as:

array1=[(0, 1), (3, 5), 2, 4]
elements1=len(array1[0])
array2[((3, 5), 4), (0, 1), 2]
elements2=len(array2[0])

What I want to do is find the number of elements in the zero'th index of each array, for the first elements1 I get the correct answer of 2 but for elements2 I also get 2 but it should be 3, I can see the problem however I can't seem to be able to work around

If each array in array_1 and array_2 respectivley, I'm trying to find number of elements at array_1[0]=(0.1)=2 elements and array_2[0]=((3,5)4)=3 elements — Dirac Delta Yeah, Mar 02 '22 at 23:02
I don't follow, can you clarify what your inputs are and what output you're looking for for those inputs, and edit those into your original question? — BrokenBenchmark, Mar 02 '22 at 23:03
@BrokenBenchmark I've updated it with minor code and another explanation, hopefully it makes more sense thanks! — Dirac Delta Yeah, Mar 02 '22 at 23:22
The first element of `array2` has two members. That's just a fact. If you want a RECURSIVE count, you will have to write a function to do that. — Tim Roberts, Mar 02 '22 at 23:31
What you need to do is flatten those inner lists. And extensive discussion of the options is https://stackoverflow.com/questions/952914/how-to-make-a-flat-list-out-of-a-list-of-lists — hpaulj, Mar 02 '22 at 23:57

score 1 · Accepted Answer · answered Mar 02 '22 at 23:39

In array2, the first index has a tuple of size 2, the first element is another tuple (3, 5), and the second element is a single int 4

If you want len(array2[0]) to return 3, you have to unpack all the values present at that index.

That can be done by the following code:

length = len(array2[0])
if isinstance(array2[0][0], tuple):
    length -= 1 
    length += len(array2[0][0])
    # replacing one with the size of the tuple

You can do this in a loop to check for all instances.

I tried to find a method to unpack the values you have, but that did not work, this was the next best solution.

Let me know if it works!

Happy to help you out! – Ali Zahid Raja Mar 03 '22 at 00:21 — Ali Zahid Raja, Mar 03 '22 at 00:21

Finding the number of elements in the first index of the array given (Python)

1 Answers1