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Re: row vectors changed to column vectors?
From: |
Henry F. Mollet |
Subject: |
Re: row vectors changed to column vectors? |
Date: |
Wed, 11 Feb 2004 09:11:22 -0800 |
User-agent: |
Microsoft-Entourage/10.1.1.2418 |
Just trying to learn a little here in view of Octave 2.1.53 ff having column
vector default instead of row vector default if we use a=1:5 (for Matlab
compatibility). Therefore toeplitz(a,shift(fliplr(a),1)) will produce
something different with a warning:
octave:11> a=1:5;
octave:12> a=a';
octave:13> toeplitz(a,shift(fliplr(a),1))
warning: in /sw/share/octave/2.1.46/m/special-matrix/toeplitz.m near line
84, column 5:
>>> warning ("toeplitz: column wins diagonal conflict");
warning: toeplitz: column wins diagonal conflict
ans =
1 1 2 3 4
2 1 1 2 3
3 2 1 1 2
4 3 2 1 1
5 4 3 2 1
Henry
on 2/10/04 11:28 PM, Christian T. Steigies at address@hidden wrote:
> On Tue, Feb 10, 2004 at 02:16:02PM -0500, Przemek Klosowski wrote:
>> But what takes much more time is creating a N:N matrix out of these
>> vectors.
>> I have to "glue" the matrix using a() as a column, where for each column
>> a()
>> has to be "rotated" by one position. I tried first with two for loops. Now
>> I
>>
>> Would this be what you need:
>>
>> a=1:5 ; toeplitz(a,shift(fliplr(a),1))
>> ans =
>>
>> 1 5 4 3 2
>> 2 1 5 4 3
>> 3 2 1 5 4
>> 4 3 2 1 5
>> 5 4 3 2 1
>
> Thats exactly it, thanks a lot! 0.6s instead of 60s.
>
> Christian
>
>
>
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-------------------------------------------------------------
- row vectors changed to column vectors?, Christian T. Steigies, 2004/02/10
- row vectors changed to column vectors?, John W. Eaton, 2004/02/10
- Re: row vectors changed to column vectors?, Jonathan Stickel, 2004/02/10
- Re: row vectors changed to column vectors?, Christian T. Steigies, 2004/02/10
- Re: row vectors changed to column vectors?, Mike Miller, 2004/02/10
- Re: row vectors changed to column vectors?, Christian T. Steigies, 2004/02/11
- Re: row vectors changed to column vectors?, Christoph Dalitz, 2004/02/10
- Re: row vectors changed to column vectors?, Przemek Klosowski, 2004/02/10
- Re: row vectors changed to column vectors?, Christian T. Steigies, 2004/02/11
- Re: row vectors changed to column vectors?,
Henry F. Mollet <=
- Re: row vectors changed to column vectors?, Paul Kienzle, 2004/02/10
- Re: row vectors changed to column vectors?, Andy Adler, 2004/02/11
- Re: row vectors changed to column vectors?, Paul Kienzle, 2004/02/11