Re: Appending to a ColumnVector

[Søren Hauberg]

Hi, sorry about the late reply...

John W. Eaton wrote:
> On 25-May-2005, Søren Hauberg wrote:
>
> | Michael Creel wrote:
> | [snip]
> | > From 
> | > http://pareto.uab.es/mcreel/OctaveClassReference/html/classColumnVector.html 
> | > there is the entry
> | > ColumnVector ColumnVector::stack   (   const ColumnVector &   a    )    
> const
> | > which looks like it might help. I don't see any resize_and_fill operation 
> | > anywhere - does this work with more or less current versions of Octave?
> | > M.
> | I'm assuming that stack concatenates two ColumnVectors, which seems a 
> | bit overkill since I simply want to append one value. The function 
> | resize_and_fill is part of the Array class, so ColumnVector inherits 
> | this operation.
>
> There should probably also be functions like
>
>   ColumnVector ColumnVector::append (double val) const;
I'm not very familiar with C++ (I'm a C-man) but shouldn't this return a 
ColumnVector& ?
>   ColumnVector& ColumnVector::append (double val);
Anyway, as I'm not really used to working with the "core" of Octave, I 
have to ask: Is this what you're looking for?

ColumnVector&
ColumnVector::append (const double val)
{
  const int len = length();
  ColumnVector &c = *new ColumnVector(len+1);

  for (int i = 0; i < len; i++)
    c(i) = xelem(i);

  c(len) = val;
  return c;
}

/Søren
> Likewise for RowVector.  P
> erhaps also a prepend function.
>
> Would you like to provide a patch?
>
> jwe
>
>
>
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