Access Violation (0xC0000005) NumPy array

Question

I have this simple NumPy/Python code below:

from numpy import zeros, float32

v = 3039345
d = 400
i = 354993
j = 0

var1 = zeros((v,d), dtype=float32)
var1[i, j] = 0 #the problem pops here

when the last line is interpreted, I have this:

Process finished with exit code -1073741819 (0xC0000005)

If i < 354993 the execution is fine. I am using Python 2.7 32-bit over Windows 8 64-bit. It is due to a limit in Memory? in this case what would be the best solution to have this working?

Yes, 64bit python3, Python 3.5.0 (v3.5.0:374f501f4567, Sep 13 2015, 02:27:37) [MSC v.1900 64 bit (AMD64)] on win32 to be exact — Tamas Hegedus
– Tamas Hegedus, Commented Jan 7, 2016 at 22:50
32bit python2.7 fails on my machine Python 2.7.10 (default, May 23 2015, 09:40:32) [MSC v.1500 32 bit (Intel)] on win32 with access violation: Unhandled exception at 0x1000696C (multiarray.pyd) in python2.exe: 0xC0000005: Access violation writing location 0x40029260. — Tamas Hegedus
– Tamas Hegedus, Commented Jan 7, 2016 at 22:53
I suspect the reason is the array size is greater than 2**32 measured in bytes — Tamas Hegedus
– Tamas Hegedus, Commented Jan 7, 2016 at 22:55

Tamas Hegedus · Accepted Answer · 2016-01-07 23:17:42Z

2

It is caused by the 32 bit version of numpy binaries. Numpy does calculate the size of the allocated memory region using platform-specific integers, and the size of the array measured in bytes does not fit in 2**32. It sounds like a bug, as it should raise an error at array creation in my opinion.

You can install 64 bit version of any python and numpy, and that will fix your problem.

answered Jan 7, 2016 at 23:17

Tamas Hegedus

30.1k12 gold badges67 silver badges102 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Access Violation (0xC0000005) NumPy array

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related