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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}


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