Error for assignment of Dynamic string for Struct array in GUI

Hi all,

I created a GUI programtically. I've a database (struct array) something like this

database.B01.Comp
database.K01.tur
database.C01.comp
.
.
.
etc.

I want to readin the data whenever the user selects particular type of data from a popupmenu. For instance, my callback function for the popup is.

function[] = pop11_2_Callback(varargin)

          % get the string of the popmenu       
          S1 = (get(handles.pop1_2,'String')); 
          % Get the user selction of the string
          S2 = (get(handles.pop1_2,'Value'));
          % User selection
          Sname = S1(S2);
    %displaying the database corresponding to particular shaft.         
    database.(Sname).turbine

      end

when I try to use this I get an error saying.

Argument to dynamic structure reference must evaluate to a valid field name.

Error in sample_gui/pop11_2_Callback (line 942)
  database.(Sname).turbine(2,:)

Error while evaluating UIControl Callback

I tried to check it with the same code outside GUI and it works. But I'm not sure what is causing problem in my case.

Thanks in advance.

Answer 1

[Walter Roberson]

Your code does not define Sname. Also, because you use str2num(), your S1 is a numeric vector so what you have named String will be a numeric value not a string.

[Bharath]

I modified the code and I still get the error. I didn't use str2num. Please see my edited code again. Thanks in advance

[Bharath]

Thanks Mr. Walter. I found the error. It was with the Sname. Sname was cell array. So I chenged the code to char(Sname) and now it works.