Re: More on Delete Problems
- To: mathgroup at smc.vnet.net
- Subject: [mg51572] Re: [mg51551] More on Delete Problems
- From: Murray Eisenberg <murray at math.umass.edu>
- Date: Sat, 23 Oct 2004 00:22:01 -0400 (EDT)
- Organization: Mathematics & Statistics, Univ. of Mass./Amherst
- References: <200410220221.WAA07306@smc.vnet.net>
- Reply-to: murray at math.umass.edu
- Sender: owner-wri-mathgroup at wolfram.com
Hi Gove,
You didn't say what version of Mathematica or which version of Windows.
With Mathematica 5.0.1 under Windows XP Pro SP2, your input gives no
crash, but rather the expected result:
a = {{1., 2., 3.}, {4., 5., 6.}};
b = {{1, 0, 1}, {0, -2, 3}, {0, 1, 0}};
c = a.b;
Delete[c, {1, 1}]
{{-1., 7.}, {4., -4., 19.}}
Note that this list of lists does NOT represent a 2-by-2 matrix! Were
you by any chance trying to delete the 1st row and the 1st column of the
result, or just, as you show, the 1st element of the 1st list of the
two-element list of lists?
Gove Effinger wrote:
> 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
>
>
>
>
--
Murray Eisenberg murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower phone 413 549-1020 (H)
University of Massachusetts 413 545-2859 (W)
710 North Pleasant Street fax 413 545-1801
Amherst, MA 01003-9305
- References:
- More on Delete Problems
- From: Gove Effinger <effinger@skidmore.edu>
- More on Delete Problems