Re: Re: More on Delete Problems

*To*: mathgroup at smc.vnet.net*Subject*: [mg51624] Re: [mg51610] Re: More on Delete Problems*From*: Andrzej Kozlowski <andrzej at akikoz.net>*Date*: Wed, 27 Oct 2004 23:42:09 -0400 (EDT)*References*: <cl9t75$7nl$1@smc.vnet.net> <200410270554.BAA24546@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Packed Arrays strike again! Try this: In[1]:= a = {{1., 2., 3.}, {4., 5., 6.}}; In[2]:= b = {{1, 0, 1}, {0, -2, 3}, {0, 1, 0}}; In[3]:= c = Developer`FromPackedArray[a . b]; In[4]:= Delete[c, {1, 1}] Out[4]= {{-1., 7.}, {4., -4., 19.}} No crash. Andrzej Kozlowski Andrzej Kozlowski Chiba, Japan http://www.akikoz.net/~andrzej/ http://www.mimuw.edu.pl/~akoz/ On 27 Oct 2004, at 14:54, Peter Valko wrote: > For the record: > > $Version > 5.0 for Microsoft Windows (June 11, 2003) > > a={{1.,2.,3.},{4.,5.,6.}} > b = {{1,0,1},{0,-2,3}, {0,1,0}} > c = a . b > Delete[c,{1,1}] > > crashes Mathematica on my machine, exactly as Give Effinger said. > > > > > > > > > Gove Effinger <effinger at skidmore.edu> wrote in message > news:<cl9t75$7nl$1 at smc.vnet.net>... >> Here's simple code which bombs for me: >> >> a={{1.,2.,3.},{4.,5.,6.}} >> >> b = {{1,0,1},{0,-2,3}, {0,1,0}} >> >> c = a . b >> >> Delete[c,{1,1}] >> >> Why? >> >> G. Effinger > >

**References**:**Re: More on Delete Problems***From:*p-valko@tamu.edu (Peter Valko)