Error using extractfield in app designer

Question

Alexandra Philip 2020-7-10

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/562946-error-using-extractfield-in-app-designer

评论： Matt J 2020-7-11

I am attempting to extract the values from specific fields of a structure in app designer.

I first added a private property(app.Mystruct) and a function which loads the struct from a mat file.

properties (Access = private)
        Mystruct % Description
    end
    
    properties (Access = public)
    end
    
    methods (Access = private)
        
        function Start(app)
            Mystruct=load('AccelQuery.mat')
        end
    end

In the call back function I used:

    rmdData=app.Mystruct;
rmdData.SERIAL_NUMBER=extractfield(rmdData,'SERIAL_NUMBER');

In an effort to extract the values from that field('SERIAL_NUMBER').

I then receive this error:

Error using extractfield
Expected input number 1, S, to be one of these types:
struct
Instead its type was double.
Error in extractfield (line 39)
validateattributes(S, {'struct'}, {'vector'}, fcnname, 'S', 1)