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Correcting snippet template

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Correcting snippet template for transpose_matrix function. Adding briefly explanation and modifying the code.
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Adán Hernández Baena
2019-10-03 09:02:20 -05:00
committed by GitHub
parent db7c1358b3
commit 81d2d7f0b0
1 changed files with 9 additions and 9 deletions
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snippets/transpose_matrix.md
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@ -3,19 +3,18 @@ title: transpose_matrix
tags: matrix,list,zip,intermediate tags: matrix,list,zip,intermediate
--- ---
Obtaining the transpose of a matrix making use of `zip()` function.
Python `zip()` function takes the iterable elements as input and returns the iterator. Python `zip()` function takes the iterable elements as input and returns the iterator.
Since zip funtion returns a `zip object`, we can cast it as list wit `list()`. Since zip funtion returns a `zip object`, we can cast it as list wit `list()`.
```py ```py
list(zip([1,2,3],['a','b','c'], [True, False, True])) list(zip([1,2,3],['a','b','c'], [True, False, True])) # [(1, 'a', True), (2, 'b', False), (3, 'c', True)]
# Output: [(1, 'a', True), (2, 'b', False), (3, 'c', True)]
``` ```
Using `*list`, we can access to each element of the list Using `*list`, we can access to each element of the list
```py ```py
[[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]] [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]] # [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]]
# Output: [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]] *[[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]] # [1, 2, 3] [4, 5, 6] [7, 8, 9] [10, 11, 12]
*[[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]]
# Output: [1, 2, 3] [4, 5, 6] [7, 8, 9] [10, 11, 12]
``` ```
Combining these two elements we can transpose a matrix. We can access to each row of the matrix using the operator `*` to use them as args of `zip()` function. Combining these two elements we can transpose a matrix. We can access to each row of the matrix using the operator `*` to use them as args of `zip()` function.
@ -23,7 +22,8 @@ Combining these two elements we can transpose a matrix. We can access to each ro
```py ```py
def transpose_matrix(l:list): def transpose_matrix(l:list):
return list(zip(*l)) return list(zip(*l))
```
print(transpose_matrix([[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]]))
# Output: [(1, 4, 7, 10), (2, 5, 8, 11), (3, 6, 9, 12)] ```py
print(transpose_matrix([[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]])) # [(1, 4, 7, 10), (2, 5, 8, 11), (3, 6, 9, 12)]
``` ```