CODEWITHSUNDEEP
matlabpersistent
Engineer
Engineer

Reputation: 13

Initialization of persistent variable in Matlab

I want to use a persistent variable inside a matlab function block but I can't initialize it. I want to either initialize it from an m.file or do it inside the function.

If I use isempty then the variable is given a size of 1x1 and I don't want that. Basically I don't know how to handle the persistent value as it is taken as 1x1 or as not defined. How can I use isempty but do not give it a 1x1 size? Or how can I initialize it from an m.file?

function y1 = fcn(u)

persistent y;

if isempty(y)
y=0;
end

for i=1:1:length(u)
    if u(1,i) >=10
       y(1,i) = 1;
    elseif u(1,i) <= 5
       y(1,i) = 0;
    else 
        ;
    end
end

y1=y;

end

Upvotes: 0

Views: 3661

Answers (1)

craigim
craigim

Reputation: 3914

You are initializing y to a scalar. If you want to initialize it to an empty vector of zeros, use y=zeros(1,n) where n is the number of elements you want it to have.

Upvotes: 1

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