Indirect addressing in structure

16 次查看（过去 30 天）
developer
developer 2011-9-8
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

请先登录，再回答此问题。

回答（3 个）

Jan
Jan 2011-9-8
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);
  2 个评论
Andrei Bobrov
Andrei Bobrov 2011-9-8
Hi Jan! Another way
fld = fields(P)
D = cellfun(@(x)P.(x),fld(x),'un',0);
Jan
Jan 2011-9-8
@Andrei: Is FIELDS documented now? Otherwise I'd suggest the older and documented FIELDNAMES.

请先登录，再进行评论。

Harry MacDowel
Harry MacDowel 2011-9-8
It works like this:-
P.variable = rand(20,1);
x = [4 5 6 9];
for ii=1:4
P.variable(x(ii)) = ii;
end
  2 个评论
Harry MacDowel
Harry MacDowel 2011-9-8
ah maybe I misunderstood your question. =)
Andrei Bobrov
Andrei Bobrov 2011-9-8
this question the continuation of this question <http://www.mathworks.com/matlabcentral/answers/15309-variable>

请先登录，再进行评论。

Wesley Ooms
Wesley Ooms 2011-9-8
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})

类别

在 Help Center 和 File Exchange 中查找有关 Programming 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by