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Re: Row or column?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg112686] Re: Row or column?
  • From: Leonid Shifrin <lshifr at gmail.com>
  • Date: Mon, 27 Sep 2010 05:45:34 -0400 (EDT)

Hi Sam,

MatrixForm is set up so that it works on vectors as well, not just matrices.
Now, {a,b} is not a matrix - it's a vector.

In[19]:= Dimensions[{a, b}]

Out[19]= {2}

Similar output appearance should not deceive you. This  will be the 1x2
matrix you seek:

{{a,b}}

In[20]:= Dimensions[{{a, b}}]

Out[20]= {1, 2}


Regards,
Leonid



On Sun, Sep 26, 2010 at 10:44 AM, Sam Takoy <sam.takoy at yahoo.com> wrote:

> Hi,
>
> How come
>
> {a, b} // MatrixForm
> {{a}, { b}} // MatrixForm
>
> produce identical outputs: columns?
>
> I would think that the first "matrix" is 1x2 and the second is 2x1.
>
> Alternatively, how do I produce a 1x2 matrix?
>
> Many thanks in advance,
>
> Sam
>
>


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