Re: Max Long
[EMAIL PROTECTED] wrote: > Indeed, as the docs pointed out. I guess I was confused by > > "If pylong is greater than ULONG_MAX, an OverflowError is raised." > > at http://docs.python.org/api/longObjects.html. Take care -- this is about "unsigned long" data type of C, not a Python "long" instance. Regards, Björn -- BOFH excuse #75: There isn't any problem -- http://mail.python.org/mailman/listinfo/python-list
Re: Max Long
On Jan 21, 7:42 pm, "Gabriel Genellina" <[EMAIL PROTECTED]> wrote: > En Mon, 21 Jan 2008 22:02:34 -0200, [EMAIL PROTECTED] > <[EMAIL PROTECTED]> escribió: > > > > > > > On Jan 21, 5:36 pm, Gary Herron <[EMAIL PROTECTED]> wrote: > >> [EMAIL PROTECTED] wrote: > >> > How can I figure out the largest long available? I was hoping for > > >> There is no explicit (defined) limit. The amount of available address > >> space forms a practical limit. > > > But not the only limitation: > > [...] > > Traceback (most recent call last): > > File "", line 2, in > > a = cf.Type12MH(k,1) > > File "C:\Program Files\PyGTK\Python\lib\collatz_functions.py", line > > 745, in Type12MH > > return TWO**(SIX*a - ONE) - ONE > > ValueError: mpz.pow outrageous exponent > > > The power function can't do exponents that have 32 or more bits > > even if the memory can hold the resulting number. > > Isn't it a limitation of the gmpy library, not of the builtin long type? Well, gmpy for sure. But as for Python's builtin longs, I wouldn't know as I've only got one lifetime. Python longs c:\python25\user>long_ago.py 1 20.0310001373291 2 90.0310001373291 3 740.0310001373291 4 6590.062362396 559260.062362396 6 533280.219000101089 7 479940 63.562362 8 4319453 8983.0787 9 GMPY longs c:\python25\user>long_ago.py 1 2 0.0 2 9 0.016324249 3 74 0.016324249 4659 0.016324249 5 5926 0.016324249 6 53328 0.016324249 7 479940 0.016324249 84319453 0.032648499 9 38875064 0.1576485 10 349875565 1.3613351 > > -- > Gabriel Genellina- Hide quoted text - > > - Show quoted text - -- http://mail.python.org/mailman/listinfo/python-list
Re: Max Long
En Mon, 21 Jan 2008 22:02:34 -0200, [EMAIL PROTECTED] <[EMAIL PROTECTED]> escribió: > On Jan 21, 5:36 pm, Gary Herron <[EMAIL PROTECTED]> wrote: >> [EMAIL PROTECTED] wrote: >> > How can I figure out the largest long available? I was hoping for >> >> There is no explicit (defined) limit. The amount of available address >> space forms a practical limit. > > But not the only limitation: > [...] > Traceback (most recent call last): > File "", line 2, in > a = cf.Type12MH(k,1) > File "C:\Program Files\PyGTK\Python\lib\collatz_functions.py", line > 745, in Type12MH > return TWO**(SIX*a - ONE) - ONE > ValueError: mpz.pow outrageous exponent > > The power function can't do exponents that have 32 or more bits > even if the memory can hold the resulting number. Isn't it a limitation of the gmpy library, not of the builtin long type? -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Max Long
On Jan 21, 3:34 pm, Bjoern Schliessmann wrote: > [EMAIL PROTECTED] wrote: > > How can I figure out the largest long available? > > Why would you? AFAIK, longs are only limited by available memory. Indeed, as the docs pointed out. I guess I was confused by "If pylong is greater than ULONG_MAX, an OverflowError is raised." at http://docs.python.org/api/longObjects.html. -- http://mail.python.org/mailman/listinfo/python-list
Re: Max Long
On Jan 21, 5:36 pm, Gary Herron <[EMAIL PROTECTED]> wrote: > [EMAIL PROTECTED] wrote: > > How can I figure out the largest long available? I was hoping for > > something like sys.maxint, but I didn't see it. Also, can someone > > point me to where I can (concisely) read about size of such types > > (int, float, long). > > There is no explicit (defined) limit. The amount of available address > space forms a practical limit. But not the only limitation: >>> import collatz_functions as cf >>> for k in xrange(1,20): a = cf.Type12MH(k,1) print 'number of digits in generation %2d:' % (k),cf.gmpy.numdigits(a) number of digits in generation 1: 2 number of digits in generation 2: 9 number of digits in generation 3: 74 number of digits in generation 4: 659 number of digits in generation 5: 5926 number of digits in generation 6: 53328 number of digits in generation 7: 479940 number of digits in generation 8: 4319453 number of digits in generation 9: 38875064 number of digits in generation 10: 349875565 Traceback (most recent call last): File "", line 2, in a = cf.Type12MH(k,1) File "C:\Program Files\PyGTK\Python\lib\collatz_functions.py", line 745, in Type12MH return TWO**(SIX*a - ONE) - ONE ValueError: mpz.pow outrageous exponent The power function can't do exponents that have 32 or more bits even if the memory can hold the resulting number. > > Gary Herron -- http://mail.python.org/mailman/listinfo/python-list
Re: Max Long
[EMAIL PROTECTED] wrote: > How can I figure out the largest long available? I was hoping for > something like sys.maxint, but I didn't see it. Also, can someone > point me to where I can (concisely) read about size of such types > (int, float, long). > There is no explicit (defined) limit. The amount of available address space forms a practical limit. Gary Herron -- http://mail.python.org/mailman/listinfo/python-list
Re: Max Long
[EMAIL PROTECTED] wrote: > How can I figure out the largest long available? Why would you? AFAIK, longs are only limited by available memory. > I was hoping for something like sys.maxint, but I didn't see it. > Also, can someone point me to where I can (concisely) read about > size of such types (int, float, long). Well, how about the docs? http://docs.python.org/lib/typesnumeric.html Regards, Björn -- BOFH excuse #397: T-1's congested due to porn traffic to the news server. -- http://mail.python.org/mailman/listinfo/python-list
Max Long
How can I figure out the largest long available? I was hoping for something like sys.maxint, but I didn't see it. Also, can someone point me to where I can (concisely) read about size of such types (int, float, long). -- http://mail.python.org/mailman/listinfo/python-list
