isOutputFixedSize

Check if outputs of a System object are fixed size

Syntax

[flag_1, flag_2, ..., flag_n] = isOutputFixedSize(obj)

Description

[flag_1, flag_2, ..., flag_n] = isOutputFixedSize(obj) returns whether each output of a System object™ is fixed size.

Examples

Check if the outputs of a System object are fixed size

Call isOutputFixedSize to check if the outputs of a System object are fixed size.

Consider a System object object defined as,

classdef UnitDelay < matlab.System
% UnitDelayNondirect Delay input by one time step

properties(DiscreteState)
        State
        Step
end

    methods(Access = protected)
        function resetImpl(obj)
            obj.State = 0; % Initialize states
            obj.Step = 1;
        end
       
        function [y1, y2] = stepImpl(obj,u)
            y1 = obj.State; % Output current state
            y2 = obj.Step; 
            
            obj.State = u;
            obj.Step = obj.Step + 1; 
        end

        function [sz1, sz2] = getOutputSizeImpl(obj)
            sz1 = [1,1]; % Specify size of output port
            sz2 = [1,1]; 
        end

        function [flag1, flag2] = isOutputFixedSizeImpl(obj)
            flag1 = true; % Specify if output is fized size
            flag2 = true;
        end

        function [c1, c2] = getOutputDataTypeImpl(obj)
            c1 = 'double'; % Specify output datatype
            c2 = 'double'; 
        end 

        function [c1, c2] = isOutputComplexImpl(obj)
            c1 = false;   % Specify if output is complex
            c2 = false; 
        end
    end

end

Create an instance of the System object and provide it with an input.

a = UnitDelay();
[out, step] = a(1);

Call isOutputFixedSize to check if the outputs of the System object are fixed size.

[flag_1, flag_2] = isOutputFixedSize(a);

Input Arguments

obj — System object

System object

System object handle used to access properties, states, and methods specific to the object. The number of outputs must match the number of outputs returned by the getNumOutputs method.

Output Arguments

flag_1, flag_2, ..., flag_n — Fixed size flag

true | false

Logical, scalar value indicating whether the specific output port is fixed size. true is returned if output is fixed size and false is returned if output is variable sized.

Version History

Introduced in R2012a