Re: Numerical Differentiation and Integration of Array Data

[Przemek Klosowski]

On 12/06/2011 10:38 PM, syberraith wrote:
> Even this fails to work:
>
> a = 2;
> b = 3;
> one = @(x) a.*x + b;
> two = @(x) a.^2.*x + b;
> one(4)
> two(5)
>
> error: `a' undefined near line 3 column 12

In Octave you have to explicitly declare global variables to be able to 
see them across the 'lexical scopes' of different function definitions.
Anonymous functions don't magically exempt you from that---but they can 
capture the values of variables from the scope they are defined in, at 
the time they are defined in.

See again what Carlo was showing; adapted to your example, it'd be

a=2;b=3;
one = @(x,a,b) a.*x+b
one_specialized_for_ab = @(x) one(x,a,b)
one_specialized_for_ab(10)