“Read_Ncol” exit with error code -1073740791

Question

I am using python 3.5.3 and igraph 0.7.1.

Why the following code finishes with "Process finished with exit code -1073740791 (0xC0000409)" error message.

from igraph import Graph

g = Graph.Read_Ncol('test.csv', directed=False)

test.csv

119 205
119 625
124 133
124 764
124 813
55 86
55 205
55 598
133 764

Answer 1

The Read_Ncol function reads files in NCOL format, as produced by the Large Graph Layout program.

Your example works fine for me, also on Python 3.5.3 with igraph 0.7.1.

>>> g = Graph.Read_Ncol('test.csv', directed=False)
>>> g
<igraph.Graph object at 0x10c4844f8>
>>> print(g)
IGRAPH UN-- 10 9 --
+ attr: name (v)
+ edges (vertex names):
119--205, 119--625, 124--133, 124--764, 124--813, 55--86, 205--55, 55--598,
133--764

It seems the error C0000409 means "Stack Buffer Overrun" on Windows, which probably means that your program is writing outside of the space allocated on the stack (it's different from a stack overflow, according to this Microsoft Technet Blog .)