Not sure what the problem in Windows might be, or for that matter in OS
X 10.9 (with 16 Gbyte RAM)
Tue Jan 21 16:51:43
iMi7:system jkt$ j8
+/i.1e8
4999999950000000
timex '+/i.1e8'
0.542757 1073744000
JVERSION
Engine: j701/2011-01-10/11:25 build: Feb 6 2011 16:16:29
Library: 8.01.017
Platform: Darwin 64
Installer: j801 beta install
InstallPath: /Applications/j64-801
+/i.1e9
499999999500000000
NB. took a bit longer, but finished without complaint
in Ubuntu (only 4 Gbytes RAM)
jkt@set1:~$ ja
JVERSION
Engine: j701/2011-01-10/11:25
Library: 7.01.086
Platform: Linux 64
Installer: j701a_linux64.sh
InstallPath: /usr/local/lib/j64-701
timex '+/i.1e8'
0.477237 1.07374e9
exit 0
exit 0
jkt@set1:~$ cat /proc/meminfo
MemTotal: 4039608 kB
MemFree: 2186156 kB
Buffers: 229532 kB
Cached: 909780 kB
SwapCached: 0 kB
Active: 908916 kB
Inactive: 587912 kB
but +/i.1e9 is doing a LOT of swapping, but looks like it might
eventually finish...
On 2014/01/21, 13:58 , Murray Eisenberg wrote:
With same version except for Mac OS X 10.9 (on machine with 16GB RAM), also no
problem getting +/ i. 10E8, but +/ i. 10E9 caused OS to run out of memory.
By contrast, on same machine, with Mathematica 9.0.1 (where indexing origin is
1, not 0):
Total[Range[10^9 - 1]]
499999999500000000
Total[Range[10^10 - 1]]
(crashes OS with out-of-memory)
(* another way: *)
Sum[i, {i, 10^10 - 1}]
49999999995000000000
There was no real point with Mathematica trying to go to higher orders of
magnitude, since Mathematica can do this symbolically:
Sum[i, {i, 10^n - 1}]
2^(-1 + n)*5^n*(-1 + 10^n)
At 21 Jan 2014 07:21:35 -0700, Don Guinn <[email protected]> wrote:
Just tried the expression +/ i. 10E8 for fun and crashed Windows 7 twice.
Locked the machine and had to reboot.
Engine: j701/2011-01-10/11:25
Library: 801.017
Qt IDE: 1.0.22/4.8.5
Platform: Win 64
Windows 7 Home Premium
Service Pack 1
——
Murray Eisenberg [email protected]
Mathematics & Statistics Dept.
Lederle Graduate Research Tower phone 240 246-7240 (H)
University of Massachusetts
710 North Pleasant Street
Amherst, MA 01003-9305
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