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## Re: extracting value from a vector

**From**: |
Rob Mahurin |

**Subject**: |
Re: extracting value from a vector |

**Date**: |
Tue, 21 Apr 2009 12:48:36 -0400 |

`On Tue, Apr 21, 2009 at 10:44 AM, Alain Baeckeroot
``<address@hidden> wrote:
`Hi
A trivial question, but i don't find the answer in the doc.

`i would like to assign value of a vector individually to some
``variables.
` octave> v = [ 1.4 , 2.7, 3.1 ]
This fails : octave> [ a, b, c ] = v;
everything goes in 'a', and b is undefined.
Is it necessary to write a = v(1); b = v(2) ...
or did i missed something ?
Alain

On Apr 21, 2009, at 11:02 AM, James Sherman Jr. wrote:

`Yes. I may miss the subtleties, but the only way I've seen the
``assignment
`
[a,b,c] = <something>
work is when <something> is a function and that it returns 3 different
variables.

I want this often enough that I've written
function varargout = columns_of (in)
[d1,d2] = size(in);
varargout = mat2cell(in, d1, ones(1,d2) );
endfunction
so I can do e.g.
octave> v = rand(2,3), [a,b] = columns_of(v)
v =
0.054753 0.509675 0.866045
0.702775 0.483820 0.816340
a =
0.054753
0.702775
b =
0.50968
0.48382
Rob
--
Rob Mahurin
Department of Physics and Astronomy
University of Tennessee 865 207 2594
Knoxville, TN 37996 address@hidden

**extracting value from a vector**, *Alain Baeckeroot*, `2009/04/21`
**Re: extracting value from a vector**, *James Sherman Jr.*, `2009/04/21`
**Re: extracting value from a vector**,
*Rob Mahurin* **<=**
**Re: extracting value from a vector**, *John W. Eaton*, `2009/04/21`
**Re: extracting value from a vector**, *Alain Baeckeroot*, `2009/04/21`
**Re: extracting value from a vector**, *Rob Mahurin*, `2009/04/21`
**Re: extracting value from a vector**, *John W. Eaton*, `2009/04/21`
**Re: extracting value from a vector**, *Rob Mahurin*, `2009/04/21`
**Re: extracting value from a vector**, *John W. Eaton*, `2009/04/21`

**Re: extracting value from a vector**, *Przemek Klosowski*, `2009/04/23`