Re: Row or column?
- To: mathgroup at smc.vnet.net
- Subject: [mg112700] Re: Row or column?
- From: Murray Eisenberg <murray at math.umass.edu>
- Date: Mon, 27 Sep 2010 05:48:09 -0400 (EDT)
The one-dimensional list {a,b} is not what you should call a matrix:
Length@Dimensions[{a, b}]
1
But { {a,b} } is properly called a matrix, because:
Length@Dimensions[{{a,b}}]
2
And
MatrixForm[{{a, b}}]
will accordingly produce a display of a one-row matrix, as you wish.
The documentation for MatrixForm explicitly says that it "prints a
single-level list in a column."
On 9/26/2010 2:44 AM, Sam Takoy 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
>
--
Murray Eisenberg murray at math.umass.edu
Mathematics & Statistics Dept.
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University of Massachusetts 413 545-2859 (W)
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