How to put vector in

I'm trying to make sign function that return sign of the input the problem is i can't make it return a vector when i type signt(4) i get the resultat but when i put a matrix i get an error

I'm trying to make sign function that return sign of the input the problem is i can't make it return a vector when i type signt(4) i get the resultat but when i put a matrix i get an error

    function y = signt(x) 
     n=length(x);
     i=0;
      while(i<n);
           if x<0
             y(i)=-1;
            else
             y(i)=1;
            end
           i=i+1;
       end
      end
    end

Answer 1

[Star Strider]

Begin ‘i’ at 1 and subscript ‘x’:

n=length(x);
i=1;
while(i<n);
    if x(i)<0
        y(i)=-1;
    else
        y(i)=1;
    end
    i=i+1;
end

[Imad Boucetta]

Thank u sir but i get a :

Error in ==> singt at 2
n=length(x)

[Star Strider]

Change it to:

n=length(x);
i=0;
while(i<n);
    i=i+1;
    if x(i)<0
        y(i)=-1;
    else
        y(i)=1;
    end    
end

That works for vectors and scalars.