Re: Unidentified subject!

[Joao Cardoso]

Hendrik Naumann wrote:
> 
> Hi Octave users
> 
> I have the a structure
> 
> a.data.d1
> a.data.d2
> a.data.d3
> a.data.d4
> ...
> 
> I want to write a function caltulatetes somthing out of the datasets
> and stores in new structure
> 
> a.result.d1
> a.result.d2
> a.result.d3
> a.result.d4
> ...
> 
> function diff_first_struct(struct)
>   for [matrix,key] = struct.data
>     struct.result.key = diff_first(matrix);
>   endfor
> endfunction
> 
> But there are two problems. That would need call by reference and a
> operator that makes it possible to defines the name
> struct1.result.key by avaluating key like struct.result.$(key), or
> something like that.

`key', in your example, is a string. You can do

eval(sprintf("struct.result.%s=diff_first(matrix)", key))

ugly...

or you can use structures of lists--on Octave 2.1.xx only

> 
> what possibilities do you see expect
> 
> a.result.d1 = func(a.data.d1);
> a.result.d2 = func(a.data.d2);
> a.result.d3 = func(a.data.d3);
> a.result.d4 = func(a.data.d4);
> 
> Thanks Hendrik Naumann
> 
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