Re: row vectors changed to column vectors?

[Henry F. Mollet]

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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