Re: Ignorance

[Daniel J Sebald]

On 03/05/2012 09:34 PM, John W. Eaton wrote:
> On  5-Mar-2012, Robert T. Short wrote:
>
> | I don't know the dimensions or the direction a-priori.  The obvious
> | answer is 1:N followed by a repmat but there are so many cute little
> | octave tricks that I was hoping there was something really clever.
>
> Given
>
>    x = 1:4;
>    y = ones (3, 1);
>    z = ones (3, 4);
>
> here are the ways I can think of:
>
>    Repmat:
>
>      repmat (x, [3,1])
>
>    Kron:
>
>      kron (x, y)
>
>    Indexing:
>
>      x(y,:)
>
>    Outer product:
>
>      y * x
>
>    Broadcasting:
>
>      z .* x
>
> Are there any others?
>
> jwe

  Cumulative sum:

    cumsum(z,2)

Dan