Indirect addressing in structure

Hello, I have structure P that has 20 fileds now if i have to adrress the values indirectly like

x =

     4
     5
     6
     9

and i have to addrress 4th ,5th,6th and 9th of values of structure P, how can i do that

Thanks in advance

Answer 1

[Jan]

You can use STRUCT2CELL to convert the struct to a cell at first:

S = struct('Field1', 1, 'Field2', 2, 'Field3', 3);
C = struct2cell(S);
disp(C{1});
disp(C{3});

% A partial list of values:
x = [1, 3];
D = C(x);

[Andrei Bobrov]

Hi Jan! Another way

fld = fields(P)

D = cellfun(@(x)P.(x),fld(x),'un',0);

[Jan]

@Andrei: Is FIELDS documented now? Otherwise I'd suggest the older and documented FIELDNAMES.

Answer 2

[Harry MacDowel]

It works like this:-

P.variable = rand(20,1);
x = [4 5 6 9];

for ii=1:4
   P.variable(x(ii)) = ii;
end

[Harry MacDowel]

ah maybe I misunderstood your question. =)

[Andrei Bobrov]

this question the continuation of this question <http://www.mathworks.com/matlabcentral/answers/15309-variable>

Answer 3

[Wesley Ooms]

 If i understand correct, it can be done with the command 
'fieldnames' it returns the names of the fields in a cell array.
  p.a=1
  p.b=2
  p.c=3
  name=fieldnames(p)
  p.(name{1})