Re: independent variable in function for leasqr

[David Bateman]

Guillem Borrell Nogueras wrote:
> It is much better to use an anonymous function to fit this purpose.
>
> In this case would be:
>
>   
>>> k = 2 
>>> f = @(x) k*x^2
>>>       
>
>   
Well, for Matlab this is true, as the inline functions use Matlab's
object class whereas anonymous functions are in the matlab
parser/interpreter itself. So under Matlab anonymous functions are
significantly faster to use than inline functions. However, under Octave
inline functions are just a special type of anonymous functions and so
there is no speed disadvantage.

That being said, yes it is still better to use anonymous functions as
then you'll have better performance if you share your code with users of
the other product... Also, the way "inline" finds what are the arguments
of the function are, is a horrible mess which Octave had to copy for
compatibility.  Anonymous functions have a much cleaner interface (i.e.
you are required to define the arguments)..

D.


> To make this thing work you must upgrade to octave 2.9.x.  In earlier 
> versions 
> of octave the anonymous function won't find the constant k.
>
> You can find more information about anonymous functions and function handles 
> here: http://www.mathworks.com/access/helpdesk/help/techdoc/matlab.html.  
> look for anonymous functions in the index.
>
> guillem
>   


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