How to create one single array with multiple array in python?

Question

I have this code to make an array that shows the index of "frq_peak" that contains each elements of "F".

a =[]
for i in range(len(F)):
    if i == 0:
        a.append(np.where(frq_peak[6] == F[i]))
    elif F[i] != F[i-1]:
        a.append(np.where(frq_peak[6] == F[i]))
a

the problem is that "a" become a combination of multiple array but I want to have just one. what should I do?

Does this answer your question? [join list of lists in python](https://stackoverflow.com/questions/716477/join-list-of-lists-in-python) — nldoty, Dec 11 '19 at 17:07

score 1 · Answer 1 · edited Dec 11 '19 at 17:30

1

You can use this code, where your array is [[1, 2, 3], [4, 5, 6], [7, 8, 9]]:

from functools import reduce

arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]

singleArray = reduce(lambda x, y: x+y, arr)

edited Dec 11 '19 at 17:30

סטנלי גרונן

2,917
23
46
68

answered Dec 11 '19 at 17:07

NeerajSahani

121
1
4

How to create one single array with multiple array in python?

1 Answers1