How to initialize a variable to zero in userdefined matlab function, which should be executed only once then the values should change dynamically

Question

Rakeshwar Elango 2020-9-29

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/601768-how-to-initialize-a-variable-to-zero-in-userdefined-matlab-function-which-should-be-executed-only-o

编辑： Ameer Hamza 2020-9-29

function [ia_avr] = fcn(ia)
iasum = iasum+Ia; 
                if xxxx
                    ia_num=ia_num+1;
                    ia_avr=ia_avr_old;
                elseif xxxx
                    ia_num=ia_num+1;
                    ia_avr=iasum/ia_num;
                    ia_avr_old=ia_avr;
         
                else            
                    ia_avr=ia_avr_old;
                    iasum=0;
                    ia_num=0;
                end
end

In this I want to initialize iasum,ia_num,ia_avr_old to 0. After which the values should change.

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Answer 1

Ameer Hamza 2020-9-29

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/601768-how-to-initialize-a-variable-to-zero-in-userdefined-matlab-function-which-should-be-executed-only-o#answer_502195

编辑：Ameer Hamza 2020-9-29

在 MATLAB Online 中打开

Such cases are handled using persistent variables.

function [ia_avr] = fcn(ia)
    persistent iasum ia_num ia_avr_old
    
    if isempty(iasum) % only runs once
        iasum = 0;
        ia_num = 0;
        ia_avr_old = 0;
    end
    
    iasum = iasum+Ia; 
    if xxxx
        ia_num=ia_num+1;
        ia_avr=ia_avr_old;
    elseif xxxx
        ia_num=ia_num+1;
        ia_avr=iasum/ia_num;
        ia_avr_old=ia_avr;
    else            
        ia_avr=ia_avr_old;
        iasum=0;
        ia_num=0;
    end
end 