In the below code (Jupiter notebook), output is given wrong, how to correct the code?
import numpy as np
A = [1,22,231,1540]
B = [[-1,1,0],[1,-1,1],[0,6,0],[0,6,0]]
C = [[113401201],[10649],[1]]
result = np.dot(np.dot(A, B),C)
print(result)
output
[-1800609408]
The actual answer is
I want to find the error and correct it
>Solution :
You’re probably running this code on 32-bit platform (where integers are 32 bit):
A = np.array(A, dtype=np.int32)
B = np.array(B, dtype=np.int32)
C = np.array(C, dtype=np.int32)
result = np.dot(np.dot(A, B), C)
print(result)
Prints (incorrectly, because the value overflows):
[-1800609408]
To correct it, use 64-bit values:
A = np.array(A, dtype=np.int64)
B = np.array(B, dtype=np.int64)
C = np.array(C, dtype=np.int64)
result = np.dot(np.dot(A, B), C)
print(result)
Prints:
[2494357888]