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MathGroup Archive 2004

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[Bug] v5, kernel crash from NullSpace

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49619] [Bug] v5, kernel crash from NullSpace
  • From: Scott Morrison <scott at math.berkeley.edu>
  • Date: Sat, 24 Jul 2004 03:48:44 -0400 (EDT)
  • Reply-to: scott at math.berkeley.edu
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

$Version == "5.0 for Microsoft Windows (November 18, 2003)"

yet another bug I've found in NullSpace, in v5. Don't ask me why you'd 
want to do this, but

NullSpace[{SparseArray[{}, {2, 1}]}]

crashes my kernel, with a Windows system error, every time. (Whereas it 
should just produce an error message complaining about the argument not 
being rectangular matrix.)

Any ideas?

Another, possibly related bug in NullSpace, is illustrated by the 
following example;

NullSpace[{{{2},{3}}}]

gives an error message, saying the argument is not a non-empty 
rectangular matrix, while

NullSpace[{SparseArray[{{2}, {3}}]}]

which should give the same result, gives

{{{-3/2},1}}

Scott Morrison


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