How to select 2 elements from a list such that it represents the size of a matrix?

Question

I was solving the matrix chain problem and I've encountered a dead end.

I have the values of p0,p1,p2,p3,p4,p5 as 4,10,3,12,20,7 respectively

now I want to mark that p0 and p1 combine together to form a matrix of [4][10] size. Similarly p1 and p2 combine to form a matrix of [10][3] size.

please help me in python language

You can create a list `p_list = [p0,p1,p2,p3,p4,p5] = [4,10,3,12,20,7]`, and then [Iterate through pairs of its items](https://stackoverflow.com/q/5764782/14627505). Is this what you want? — Vladimir Fokow, Aug 25 '22 at 18:43
separate representation like m1=[4,10], m2=[10,3] ... and so on, this can be done manually but I want it with a code to make it more dynamic — Rama Krishna Mandapaka, Aug 25 '22 at 18:52

score 0 · Answer 1 · answered Aug 25 '22 at 18:54

0

p_list = [p0,p1,p2,p3,p4,p5] = [4,10,3,12,20,7]
m_list = []

for a, b in zip(p_list, p_list[1:]):
    m_list.append([a, b])

m1, m2, m3, m4, m5 = m_list

answered Aug 25 '22 at 18:54

Vladimir Fokow

3,728
2
5
27

score 0 · Accepted Answer · answered Aug 25 '22 at 19:05

0

you can create a list of the ps then zip together the 0 to n-1 elements with 1 to n and list them:


p = [4,10,3,12,20,7]
m1, m2, m3, m4, m5  =  list( zip( p[:-1],p[1:] ) )

answered Aug 25 '22 at 19:05

Ulises Bussi

1,635
1
2
14

`p[:-1]` can be just `p` because `zip` automatically stops when the shortest sequence ends – Vladimir Fokow Aug 25 '22 at 19:08
yup, but for me it's moe clear to explicity take 2 list from same length in `zip` – Ulises Bussi Aug 25 '22 at 19:09

How to select 2 elements from a list such that it represents the size of a matrix?

2 Answers2