Thread Subject: use string to define input variables

Hi everybody,
I have a stucture STRUCT1 with fields:
field1,field2,field3

I have second structure STRUCT2 made in the following
way:

STRUCT2.field4.func=@function1;
STRUCT2.field4.variab={'field1','field2'};

STRUCT2 is used to mean that to obtain field4 in STRUCT1,
you have to apply function1, to the value stored in field1
and field2.

I would like to know if there is a way to automatically
computer STRUCT1.field4,
so that I can build a cycle, on all the derived values info
stored in STRUCT2.

I was thinking something like

A=fieldnames(STRUCT2)

for i=1:size(A,1)
STRUCT1.(A{i})=feval(STRUCT2.(A{i}).func,.....

But I can't understand how to pass argument values to the
feval statement.

I'm probably not thinking to the right approach for this
kind of problem,
so if you have any advice I would really appreciate it.

Thank you very much in advance,
Cheers -Luca-

"Luca Cerone" <cerone@to-see.it> wrote in message
news:fph2ki$k71$1@fred.mathworks.com...
> Hi everybody,
> I have a stucture STRUCT1 with fields:
> field1,field2,field3
>
> I have second structure STRUCT2 made in the following
> way:
>
> STRUCT2.field4.func=@function1;
> STRUCT2.field4.variab={'field1','field2'};
>
> STRUCT2 is used to mean that to obtain field4 in STRUCT1,
> you have to apply function1, to the value stored in field1
> and field2.
>
> I would like to know if there is a way to automatically
> computer STRUCT1.field4,
> so that I can build a cycle, on all the derived values info
> stored in STRUCT2.
>
> I was thinking something like
>
> A=fieldnames(STRUCT2)
>
> for i=1:size(A,1)
> STRUCT1.(A{i})=feval(STRUCT2.(A{i}).func,.....
>
> But I can't understand how to pass argument values to the
> feval statement.

Look at the Remarks section of the FEVAL reference page for an example:

http://www.mathworks.com/access/helpdesk/help/techdoc/ref/feval.html

Alternately, you may be able to forego the FEVAL:

http://blogs.mathworks.com/loren/2006/01/11/mental-model-for-feval/

--
Steve Lord
slord@mathworks.com