CODEWITHSUNDEEP
python-2.7list
Condo_programmer
Condo_programmer

Reputation: 236

do subtraction from two list

I have 2 two lists like: 1:

[[113, 3528.27], [114, 4376.139999999999], [116, 4328.85], [124, 390.27], [127, 814.12]]

2:

[[113, 1237], [114, 4422], [116, 1245], [124, 324], [127, 242]]

I want to match the first element in each sublist, and do subtraction for the second element in the sublist. I used simple loop as:

for i in 1:
  for j in 2:
     if i == j:
        i[1] - j[1]

is there a fast way to make it?

Thanks a lot!

Upvotes: 0

Views: 42

Answers (2)

zipa
zipa

Reputation: 27869

Is this what you were looking for:

a = [[113, 3528.27], [114, 4376.139999999999], [116, 4328.85], [124, 390.27], [127, 814.12]]
b = [[113, 1237], [114, 4422], [116, 1245], [124, 324], [127, 242]]
c = [[x[0], x[1] - y[1]] for x, y in zip(a, b)]

Upvotes: 1

Allan Mwesigwa
Allan Mwesigwa

Reputation: 1298

Your question is a bit hard to interpret. Maybe some expected output would have made the difference. However, this is what I interpreted it to mean.

def sub_two_lists(list1, list2):
    sublist = []
    mainlist = []
    for i in list1:
        for j in list2:
            if i[0] == j[0]:
                sublist.append(i[0])
                susblist.append(i[1] - j[1])
        mainlist.append(sublist)
        sublist = []
    return mainlist

list1 = [[113, 3528.27], [114, 4376.139999999999], [116, 4328.85], [124, 390.27], [127, 814.12]]
list2 = [[113, 1237], [114, 4422], [116, 1245], [124, 324], [127, 242]]
print(sub_two_lists(list1, list2))

Expected output: [[113, 2291.27], [114, -45.86000000000058], [116, 3083.8500000000004], [124, 66.26999999999998], [127, 572.12]]

Upvotes: 0

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