Difference between array and matrix and usage of "~"

-----maxima-bounces at math.utexas.edu wrote: -----

>To: maxima at math.utexas.edu
>From: &#30000; &#20864;&#28949; <tianjh04 at mails.tsinghua.edu.cn>
>Sent by: maxima-bounces at math.utexas.edu
>Date: 11/13/2007 06:27AM
>Subject: Difference between array and matrix and usage of "~"
>
>(C2) A : matrix([1,2,3], [4,5,6])$
>(C3) row(A,1) ~ row(A,2);
>(D3)                       [ 1  2  3 ] ~ [ 4  5  6 ]
>(C4) express(row(A,1) ~ row(A,2));
>~ USED WITH IMPROPER ARGUMENTS: [ 1  2  3 ] [ 4  5  6 ]

Try this:

(%i2) A : matrix([1,2,3], [4,5,6])$
(%i3) express(inpart(A,1) ~ inpart(A,2));
(%o3) [-3,6,-3]

BW