Re: AppendColumns
- To: mathgroup at smc.vnet.net
- Subject: [mg41708] Re: AppendColumns
- From: Bill Rowe <listuser at earthlink.net>
- Date: Mon, 2 Jun 2003 04:35:17 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
On 5/31/03 at 6:07 AM, gamote at ap.univie.ac.at (Gabriel Molina-Terriza)
wrote:
>I have tried to Append Rows to a matrix, with the AppendRows
>instruction and is not working very well. The matrices are numerical,
>but come from an evaluation. The instruction I use is
>tt=AppendRows[Num,B[[Table[i,{i,1,2}]]]] and the result is something
>like AppendRows{{1,2},{3,4}}
>Any idea why?
It looks like tried to feed AppendRows *vectors* when it expects *matrices*
Look at the following and see if that makes things clearer
In[2]:=
a=Range[3];
b=Range[4,6];
AppendRows[a,b]
Out[4]=
AppendRows[{1,2,3},{4,5,6}]
In[5]:=
AppendRows[{a},{b}]
Out[5]=
{{1,2,3,4,5,6}}
In[6]:=
VectorQ/@{a,b}
Out[6]=
{True,True}
In[7]:=
MatrixQ/@{a,b}
Out[7]=
{False,False}