2D numpy.array之和的Python错误行为
所以,我有一个数字列表2D numpy.array之和的Python错误行为,python,python-3.x,numpy,numpy-ndarray,Python,Python 3.x,Numpy,Numpy Ndarray,所以,我有一个数字列表 weird_list = [800153196, 946067665, 827629917, 868941741, 875745873, 926109150, 1353347195, 1003235074, 1053666891, 14421
weird_list = [800153196,
946067665,
827629917,
868941741,
875745873,
926109150,
1353347195,
1003235074,
1053666891,
1442194993,
1924716858,
1060724069,
1182240731,
1646547575,
1215762661,
1520107722,
1512568609,
1534064291,
1549459216,
1773697582,
1853820087,
1696910852,
1563415785,
1692314635,
1627783113]
我的目标是获得该列表每对的和的2dnp.array
例如:
weird_list = [1, 2, 3]
resulting_array = [[0, 1, 2],
[1, 2, 3],
[2, 3, 4]]
我编写了这个函数,它可以很好地用于较小的数字,但不是必需的,因为我在具有较大数字的数组上进行了测试。这个数组的问题是,我以某种方式获得了负数
我还写了一些小/大数字列表的例子
low_list = [0, 1, 2, 3]
ex_list = []
weird_list_div_10 = []
weird_list_mult_10 = []
for i in range(len(weird_list)):
ex_list.append(i)
weird_list_div_10.append(weird_list[i] // 10)
weird_list_mult_10.append(weird_list[i] * 10)
完整代码的源代码:
对于原始列表中的值,uint32将起作用。顶部位不表示无符号整数的符号。如果使用numpy int32数组,某些结果将溢出。在这些情况下,结果可能是负面的。int64不应该溢出。检查数组的数据类型
low_list = [0, 1, 2, 3]
ex_list = []
weird_list_div_10 = []
weird_list_mult_10 = []
for i in range(len(weird_list)):
ex_list.append(i)
weird_list_div_10.append(weird_list[i] // 10)
weird_list_mult_10.append(weird_list[i] * 10)
import numpy as np
weird_list = [ 926109150, 1353347195, 1003235074 ]
arr = np.array( weird_list, dtype = np.int32 ) # int32 forced here
arr.reshape( 1, -1 ) + arr.reshape( -1, 1 )
# Out[12]: # int32 leads to some negative answers.
# array([[ 1852218300, -2015510951, 1929344224],
# [-2015510951, -1588272906, -1938385027],
# [ 1929344224, -1938385027, 2006470148]], dtype=int32)
2**31-1
# Out[14]: 2147483647 # Any number greater than this in int32 will be truncated to it's
# 32 lowest bits. if bit 31 ( counting bits 0 to 31 ) is 1 it's treated as a negative number.
arr = np.array( weird_list, dtype = np.int64 ) # int64 forced.
arr.reshape( 1, -1 ) + arr.reshape( -1, 1 )
# Out[16]: # int64 doesn't overflow therefore all results are positive with these values
# array([[1852218300, 2279456345, 1929344224],
# [2279456345, 2706694390, 2356582269],
# [1929344224, 2356582269, 2006470148]])