GMPY compare warning

[Mensanator]

In the program that follows, I get the following warning message:

collatz_.py:37: RuntimeWarning: tp_compare didn't return -1, 0 or 1
while b>1:

In this case, b is a gmpy.mpz number. The program operates as it should,
which I guess is why it's a warning. Is there some reason why I shouldn't
use gmpy numbers with relational operators? Is this warning something
that can safely be ignored?


import sys
import time
import gmpy

i = long(sys.argv[1])

n = 2**(i) - 1

r1 = 0
r2 = 0
t0 = time.time()

a = n

while a>1:
z = divmod(a,2)
if z[1]==0:
a = z[0]
r1 += 1
else:
a = a*3 + 1
r2 += 1

t1 = time.time()

print "r1",r1,"r2",r2,"in",t1-t0,"seconds\n"
b = gmpy.mpz(n)

r1 = 0
r2 = 0
t0 = time.time()

while b>1:
z = gmpy.scan1(b)
if z==0:
b = b*3 + 1
r2 += 1
else:
b = b/(2**z)
r1 += z

t1 = time.time()

print "r1",r1,"r2",r2,"in",t1-t0,"seconds\n"

"""
C:\Python23\user>python collatz_.py 1000
r1 7841 r2 4316 in 0.109000086784 seconds
r1 7841 r2 4316 in 0.375 seconds

C:\Python23\user>python collatz_.py 10000
r1 86278 r2 48126 in 6.42199993134 seconds
r1 86278 r2 48126 in 4.85900008678 seconds

C:\Python23\user>python collatz_.py 100000
r1 863323 r2 481603 in 604.766000032 seconds
r1 863323 r2 481603 in 121.859999895 seconds
"""


--
Mensanator
Ace of Clubs

[Duncan Smith]

"Mensanator" <me********@aol.compost> wrote in message
news:20***************************@mb-m05.aol.com...

In the program that follows, I get the following warning message:

collatz_.py:37: RuntimeWarning: tp_compare didn't return -1, 0 or 1
while b>1:

In this case, b is a gmpy.mpz number. The program operates as it should,
which I guess is why it's a warning. Is there some reason why I shouldn't
use gmpy numbers with relational operators? Is this warning something
that can safely be ignored?

http://sourceforge.net/tracker/index...3&group_id=547
0&atid=305470

might help?

Duncan

[Mensanator]

>Subject: Re: GMPY compare warning

From: "Duncan Smith" bu*****@urubu.freeserve.co.uk
Date: 11/29/2003 8:50 AM Central Standard Time
Message-id: <bq**********@news8.svr.pol.co.uk>
"Mensanator" <me********@aol.compost> wrote in message
news:20***************************@mb-m05.aol.com...

In the program that follows, I get the following warning message:

collatz_.py:37: RuntimeWarning: tp_compare didn't return -1, 0 or 1
while b>1:

In this case, b is a gmpy.mpz number. The program operates as it should,
which I guess is why it's a warning. Is there some reason why I shouldn't
use gmpy numbers with relational operators? Is this warning something
that can safely be ignored?

http://sourceforge.net/tracker/index...3&group_id=547
0&atid=305470

might help?

Thanks.

Duncan

--
Mensanator
Ace of Clubs