Error, (in evala/Factors) powering may produce overflow

Thomas D. Dean

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Mar 24, 2013, 1:19:58 AM3/24/13

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Maple 15 amd64 ubuntu 12.04

Does this error relate to ulimit?

Is there a fix?

Tom Dean

tom...@speakeasy.org

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Mar 24, 2013, 1:26:20 AM3/24/13

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On Saturday, March 23, 2013 10:19:58 PM UTC-7, Thomas D. Dean wrote:
> maple
|\^/| Maple 15 (X86 64 LINUX)
._|\| |/|_. Copyright (c) Maplesoft, a division of Waterloo Maple Inc. 2011
\ MAPLE / All rights reserved. Maple is a trademark of
<____ ____> Waterloo Maple Inc.
| Type ? for help.
> Ri^2-(Ri^2-Rj^2-c^2)^2/(2*c)^2 ;
2 2 2 2
2 (Ri - Rj - c )
Ri - -----------------
2
4 c

> factor(%);
Error, (in iroot) powering may produce overflow

Nasser M. Abbasi

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Mar 24, 2013, 3:12:43 AM3/24/13

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|\^/| Maple 17 (X86 64 WINDOWS)
._|\| |/|_. Copyright (c) Maplesoft, a division of Waterloo Maple Inc. 2013

\ MAPLE / All rights reserved. Maple is a trademark of
<____ ____> Waterloo Maple Inc.
| Type ? for help.
> Ri^2-(Ri^2-Rj^2-c^2)^2/(2*c)^2 ;
2 2 2 2
2 (Ri - Rj - c )
Ri - -----------------
2
4 c

> factor(%);

2 2 2 2 2 2
(Ri - 2 Ri c - Rj - c ) (Ri + 2 Ri c - Rj - c )
- ---------------------------------------------------
2
4 c

>

--Nasser

G. A. Edgar

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Mar 24, 2013, 7:36:33 AM3/24/13

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|\^/| Maple 15 (APPLE UNIVERSAL OSX)

._|\| |/|_. Copyright (c) Maplesoft, a division of Waterloo Maple
Inc. 2011
\ MAPLE / All rights reserved. Maple is a trademark of
<____ ____> Waterloo Maple Inc.
| Type ? for help.
> Ri^2-(Ri^2-Rj^2-c^2)^2/(2*c)^2 ;
2 2 2 2
2 (Ri - Rj - c )
Ri - -----------------
2
4 c

> factor(%);

2 2 2 2 2 2

(-Rj + Ri - c - 2 Ri c) (-Rj + Ri + 2 Ri c - c )
- -----------------------------------------------------
2
4 c

--
G. A. Edgar http://www.math.ohio-state.edu/~edgar/

acer

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Mar 24, 2013, 9:30:28 AM3/24/13

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I believe that I heard somewhere that this problem was due to an OS runtime library incombatibility, and that Maplesoft's Tech Support (sup...@maplesoft.com) might have some (manually applied) fix for it for Maple 15.

I could be mistaken; you could try asking them.

Thomas D. Dean

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Mar 24, 2013, 7:35:18 PM3/24/13

to

Thomas D. Dean wrote:
> maple
|\^/| Maple 15 (X86 64 LINUX)

._|\| |/|_. Copyright (c) Maplesoft, a division of Waterloo Maple Inc.
2011
\ MAPLE / All rights reserved. Maple is a trademark of
<____ ____> Waterloo Maple Inc.
| Type ? for help.
> Ri^2-(Ri^2-Rj^2-c^2)^2/(2*c)^2 ;
2 2 2 2
2 (Ri - Rj - c )
Ri - -----------------
2
4 c
> factor(%);

Error, (in iroot) powering may produce overflow

> Ri^2-(Ri^2-Rj^2-c^2)^2/(2*c)^2 ;
2 2 2 2
2 (Ri - Rj - c )
Ri - -----------------
2
4 c
> factor(%);
2 2 2 2 2 2

(-Rj + Ri + 2 Ri c - c ) (-Rj + Ri - 2 Ri c - c )

- -----------------------------------------------------
2
4 c

> Ri^2-(Ri^2-Rj^2-c^2)^2/(2*c)^2 ;
2 2 2 2
2 (Ri - Rj - c )
Ri - -----------------
2
4 c
> factor(%);
2 2 2 2 2 2

(-Rj + Ri + 2 Ri c - c ) (-Rj + Ri - 2 Ri c - c )

- -----------------------------------------------------
2
4 c

This is a scary problem. Not repeatable. MOst likely an uninitialized
pointer or memory, etc.

Tom Dean

acer

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Mar 24, 2013, 8:15:40 PM3/24/13

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Le dimanche 24 mars 2013 01:19:58 UTC-4, Thomas D. Dean a écrit :

It is a 64bit Linux platform specific problem present in Maple 15 (but apparently not it Maple 16 and 17) that is restricted to later (newer) Linux distribution releases. Eg. it occurs with 64bit ubuntu 12.04.

See

http://www.mapleprimes.com/questions/130220-Maple-15-X86-64-LINUX-Fedora-16-Log2#comment130515

and

http://www.mapleprimes.com/questions/133905-Maple-15Linux-64Bit-Bug-In-Integration#comment133969