Error for assignment of Dynamic string for Struct array in GUI

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Bharath
Bharath 2016-2-2
评论： Bharath 2016-2-3
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.

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回答（1 个）

Walter Roberson
Walter Roberson 2016-2-2
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.
  2 个评论
Bharath
Bharath 2016-2-3
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
Bharath 2016-2-3
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.

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