Error: Dot indexing is not supported for variables of this type.

Dear community, when I add a row to a matrix in structure parameter,

a = ones(1,5);
parameter.A = [parameter.A; a];

the following error occurs: Dot indexing is not supported for variables of this type. I don't know how to modify it.

[per isakson]

Show us the results of

whos parameter

and

parameter

[yutong wu]

Sorry, maybe I wasn't being clear. "parameter.A" initial value is []. On each loop iteration, "a" will be changed and I want to record all "a" in the structure matrix "parameter.A".

Answer 1

[per isakson]

I cannot reproduce your problem. This works

%%
parameter.A = [];
a = ones(1,5);
parameter.A = [parameter.A; a];
b = 2*ones(1,5);
parameter.A = [parameter.A; b]

and outputs

>> parameter = 
  struct with fields:
    A: [2×5 double]
    
>> parameter.A
ans =
     1     1     1     1     1
     2     2     2     2     2
>> 

[yutong wu]

Thank you, the expression is okay. I find the reason. I set the structure parameter as [], which lead to the error.

Answer 2

[Yuichi Mimura]

If you simply wish to add row "a" to a part of Structure Array "parameter", the below code will realize this.

a = ones(1,5);
parameter.A = a;
>> parameter.A
ans =
     1     1     1     1     1

Can this be your solution?

[yutong wu]

"a" will be changed in a loop. I need to add row "a" to the existing "parameter".