"Assignment between unlike types is not allowed" in STRUCTURES

Hello,

Please suppose the following matrices and structure:

X1 = zeros(1, 4);
X2 = zeros(2, 4);
X3 = zeros(3, 4);

AA.SM = []; p = repmat(AA, 3, 1); % 3 is not fixed
PN.SM = p; PN = repmat(PN, 100, 1); % 100 is not fixed

When I want to assign X1, X2 and X3 to PN, I receive an error stating that "Assignment between unlike types is not allowed."

PN(1).SM(1) = X1;
PN(1).SM(2) = X2;
PN(1).SM(3) = X3;

I have also tried "setfield" function, but it does not work.

Could you please help me to resolve this difficulty?

Best regards,

AM

Answer 1

[Walter Roberson]

X1 = zeros(1, 4);

so X1 is numeric

AA.SM = []; p = repmat(AA, 3, 1); % 3 is not fixed

so p is a 3 x 1 structure array, each element of which is a struct with field SM

PN.SM = p;

So PN is a scalar stucture array with field PN, and PN.SM is a 3 x 1 structure array, each element of which is a struct with field SM

PN = repmat(PN, 100, 1); % 100 is not fixed

and now PN is a 100 x 1 structure array, each entry of which has a field named SM, and each of those contains a 3 x 1 structure array, each element of which is a struct with field SM

PN(1).SM(1) = X1;

PN(1) is a single struct array entry with field SM that is a 3 x 1 struct array. PN(1).SM(1) is a single struct array entry, the contents of which is a struct with field SM. And you are trying to assign zeros(1,4) to it instead of a struct.

Answer 2

[KSSV]

You amy try something like this:

PN = struct ; 
PN(1).SM(1).X = rand(10,1) ; 
PN(1).SM(2).X = rand(20,1) ; 
PN(1).SM(3).X = rand(30,1) ;