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isOutputFixedSize

Check if outputs of a System object are fixed size

    Description

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

    example

    Examples

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    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

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    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

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    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