J allocates memory in chunks of size a power of 2.
On Wed, Jan 11, 2012 at 12:07 PM, Devon McCormick <devon...@gmail.com>wrote: > Well, that would explain a factor of 2 difference but not the factor of 2.5 > that I observe. > > On Wed, Jan 11, 2012 at 2:44 PM, David Mitchell <davidmitch...@att.net > >wrote: > > > The size of integer is 8 bytes in 64 bit J. > > > > On 1/11/2012 14:42, Devon McCormick wrote: > > > Can anyone explain why this variable is much larger than it ought to > be? > > > Are integers more than 4 bytes in 64-bit J7? > > > > > > $RH5 > > > 2598960 5 > > > 3!:0 RH5 NB. is integer > > > 4 > > > */4,$RH5 NB. Should be about this big > > > 51979200 > > > 7!:5<'RH5' NB. but this seems far too large, even if there's some > > > overhead. > > > 1.3421773e8 > > > (7!:5<'RH5') % */4,$RH5 > > > 2.582143 > > > > > > JVERSION > > > Engine: j701/2011-01-10/11:25 > > > Library: 7.01.052 > > > Platform: Win 64 > > > Installer: j701a_win64.exe > > > InstallPath: c:/program files (x86)/j64-701 > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
