adding empty numerical fields in structure array

Dear All,

I am sure this is trivial for you wizzes. I have a structure A with fields A.field1,A.field2, A.field3, with fields 1 and 2 cell arrays, and field3 numerical double array. How do I add two empty, numerical double, fields named 'field4' and 'field5', to A, that I can fill later separately?

Thank you,

Octavio

Answer 1

[per isakson]

Yes, that's simple:

    A.field4 = [];
    A.field5 = [];

&nbsp

In response to comment

    >> clear A
    >> A.f1=1;
    >> A.f2=2;
    >> A.field5 = [];
    >> A.field4 = [];
    >> A
    A = 
            f1: 1
            f2: 2
        field5: []
        field4: []
    >>

So far so good.

    >> A=[A,A]
    A = 
    1x2 struct array with fields:
        f1
        f2
        field5
        field4
        f3
    >> A.f4 = []
    Incorrect number of right hand side elements in dot name assignment.  
    Missing [] around left hand side is a likely cause.

Ok, I missed that you have a struct array

    >> A(1).f4 = []
    A = 
    1x2 struct array with fields:
        f1
        f2
        field5
        field4
        f3
        f4
    >> A(1).f4 
    ans =
         []
    >> A(2).f4
    ans =
         []

Or better

    >> [A.f5] = deal([])
    A = 
    1x2 struct array with fields:
        f1
        f2
        field5
        field4
        f3
        f4
        f5

[per isakson]

moved from an answer by per isakson

Dear Per,

Trying A.field4 = [];

I get the error:

Incorrect number of right hand side elements in dot name assignment. Missing [] around left hand side is a likely cause. Please advise