Python 只有整数、切片 (`:`)、省略号 (`...`)、numpy.newaxis (`None`) 和整数或布尔数组是有效索引
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only integers, slices (`:`), ellipsis (`...`), numpy.newaxis (`None`) and integer or boolean arrays are valid indices
提问by Messit?zil
I am implementing fft as part of my homework. My problem lies in the implemention of shuffling data elements using bit reversal. I get the following warning:
我正在实施fft作为我作业的一部分。我的问题在于使用位反转实现改组数据元素。我收到以下警告：
DeprecationWarning: using a non-integer number instead of an integer will result in an error in the future.
data[x], data[y] = data[y], data[x]
弃用警告：使用非整数而不是整数将导致将来出错。
数据[x]，数据[y] = 数据[y]，数据[x]
And the auto grading system (provided by university) returns the following:
自动评分系统（由大学提供）返回以下内容：
error: only integers, slices (
:), ellipsis (...), numpy.newaxis (None) and integer or boolean arrays are valid indices.
错误：只有整数、切片 (
:)、省略号 (...)、 numpy.newaxis (None) 和整数或布尔数组是有效索引。
My code is:
我的代码是：
def shuffle_bit_reversed_order(data: np.ndarray) -> np.ndarray:
"""
Shuffle elements of data using bit reversal of list index.
Arguments:
data: data to be transformed (shape=(n,), dtype='float64')
Return:
data: shuffled data array
"""
# implement shuffling by reversing index bits
size = data.size
half = size/2;
for x in range(size):
xx = np.int(x)
n = np.int(half)
y = 0
while n > 0:
y += n * np.mod(xx,2)
n /= 2
xx = np.int(xx /2)
if (y > x):
data[x], data[y] = data[y], data[x]
return data
I have already implemented the function for fft but it won't work until I get this shuffling function working. I think the problem is my data is of type 'float64' and I may have used it as an integer but I don't know how I can solve it.
我已经实现了 fft 的功能，但在我让这个改组功能工作之前它不会工作。我认为问题是我的数据是“float64”类型的，我可能将它用作整数，但我不知道如何解决它。
采纳答案by L. Hovan
I believe your problem is this: in your while loop, n is divided by 2, but never cast as an integer again, so it becomes a float at some point. It is then added onto y, which is then a float too, and that gives you the warning.
我相信你的问题是这样的：在你的 while 循环中，n 除以 2，但再也不会被转换为整数，所以它在某个时候变成了一个浮点数。然后将它添加到 y 上，然后它也是一个浮点数，这会给你警告。
回答by Sarvagya Gupta
You can use // instead of single /. That converts to intdirectly.
您可以使用 // 而不是单个 /。那int直接转换为。
回答by Vijay Meduri
put a intinfront of the all the voxelCoord's...Like this below :
把int所有的东西放在voxelCoord前面……像下面这样：
patch = numpyImage [int(voxelCoord[0]),int(voxelCoord[1])- int(voxelWidth/2):int(voxelCoord[1])+int(voxelWidth/2),int(voxelCoord[2])-int(voxelWidth/2):int(voxelCoord[2])+int(voxelWidth/2)]
