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What does -1 mean in numpy reshape?
...eria
Now see the example.
z = np.array([[1, 2, 3, 4],
[5, 6, 7, 8],
[9, 10, 11, 12]])
z.shape
(3, 4)
Now trying to reshape with (-1) . Result new shape is (12,) and is compatible with original shape (3,4)
z.reshape(-1)
array([ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12])
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For each row return the column name of the largest value
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8 Answers
8
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Insert a line at specific line number with sed or awk
...pt file which I need to modify with another script to insert a text at the 8th line.
9 Answers
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Split a vector into chunks in R
...gt; d
[1] 3 1 11 4 1 2 3 2 4 10 10 2 7 4 6 6 2 1 1 2 3 8 3 10 7 4
[27] 3 4 4 1 1 7 2 4 6 0 5 7 4 6 8 4 7 12 4 6 8 4 2 7 6 5
[53] 4 5 4 5 5 8 7 7 7 6 2 4 3 3 8 11 6 6 1 8 4
> max <- 20
> x <- seq_along(d)
> d1 <- sp...
Remove all the elements that occur in one list from another
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Trilarion
8,77699 gold badges5050 silver badges8888 bronze badges
answered Nov 18 '10 at 2:48
DonutDonut
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Transpose list of lists
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How about
map(list, zip(*l))
--> [[1, 4, 7], [2, 5, 8], [3, 6, 9]]
For python 3.x users can use
list(map(list, zip(*l)))
Explanation:
There are two things we need to know to understand what's going on:
The signature of zip: zip(*iterables) This means zip expects an arb...
How do I make a matrix from a list of vectors in R?
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[6,] 6 1 2 3 4 5
[7,] 7 1 2 3 4 5
[8,] 8 1 2 3 4 5
[9,] 9 1 2 3 4 5
[10,] 10 1 2 3 4 5
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Why does [5,6,8,7][1,2] = 8 in JavaScript?
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388
[1,2,3,4,5,6][1,2,3];
^ ^
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array + — array subscript...
Getting key with maximum value in dictionary?
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edited Feb 22 '18 at 17:51
Priyanka Chaudhary
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answered N...
Version of SQLite used in Android?
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482
UPDATE OCT 2016: Here is a link to the updated official docs which includes the main points in ...