[英]Utilising for loop and numpy.tile to create an array of alternating values i.e. (1, -3, 5, -7, 9, -11...)
Is it possible to combine for loop
and numpy.tile
to create an alternating incremental array?是否可以结合
for loop
和numpy.tile
来创建交替增量数组?
numpy.tile(A, reps)
constructs an array by repeating A the number of times given by reps . numpy.tile(A, reps)
通过将 A 重复 reps 给定的次数来构造一个数组。 Since you want to alternate values, I don't think it is possible (or at least, preferable) to use this function to achieve your goal.由于您想要交替值,我认为使用此 function 来实现您的目标是不可能的(或者至少,更可取)。
How about using only a for
loop (list comprehension)?仅使用
for
循环(列表理解)如何?
output = [i * (1 if i % 4 == 1 else -1) for i in range(1, 25, 2)]
use resize()
:使用
resize()
:
In [38]: np.resize([1,-1], 10) # 10 is the length of result array
Out[38]: array([ 1, -1, 1, -1, 1, -1, 1, -1, 1, -1])
for odd length:对于奇数长度:
In [39]: np.resize([1,-1], 11)
Out[39]: array([ 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1])
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