loop through two multidimensional arrays

Question

I have two multiD lists

 list one [["hello","how", "are", "you"]] and
 list two [["ss", "gg", "ff"]]

I want to compare EACH of the rows in list one with all of the rows values in list two.

Example

If list one has 2 rows with arrays list[2][values]
and list two has 3 rows with arrays list[3][values]
then

list one [0][all values] compare with
     list two[0][values],
     list two[1][values],
     list two[2][values], and
     list two[3][values].
Then take row two of list one and compare it with
     all rows in list two again
     and so on.

how could that be done?

I can't understand your explanation. Can you post a sample input and output? — Mike Graham, Feb 15 '14 at 23:09
did you try to write any code so far? SO is not a site to ask others to do stuff on your behalf, but a place where you can get *help* — zmo, Feb 15 '14 at 23:10

score 3 · Answer 1 · answered Feb 15 '14 at 23:31

3

Basically, it's nested for loop. You can use list comprehension to do that.

matches = [(A.index(a),B.index(b)) for a in A for b in B if len(set(a).intersection(set(b)))]

answered Feb 15 '14 at 23:31

afkfurion

2,767
18
12

score 0 · Answer 2 · edited May 23 '17 at 12:05

0

Since your question is pseudo-code, I'll respond the same way. ;-)

for all rows in list1:
    for all rows in list2:
        %comparison of rows..
        matches = set(current row of list1) & set(current row of list2)

Basically, this SO question/answer should cover your problem. Possibly, there is a more efficient way to the solution. I'm a beginner with python myself.

edited May 23 '17 at 12:05

Community

1
1

answered Feb 15 '14 at 23:16

fuesika

3,280
6
26
34

score 0 · Answer 3 · answered Feb 15 '14 at 23:19

0

So given

A = [[1,2,3],[4,5,6],[7,8,9]]
B = [[11,12,13],[14,15,16],[17,18,19]]

Is this what you want?

for a_row in A:
  for b_row_i in xrange(len(B)):
    print 'compare', a_row, B[b_row_i]

answered Feb 15 '14 at 23:19

Nat

2,689
2
29
35

loop through two multidimensional arrays

3 Answers3