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How to multiply one elements with rest of the elements in Galois field

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Hi, I am working in Galois field, The generated field is GF( 2^4)
poly=[1 1 0 0 1];
field1=gftuple([-1:p^n-2]',poly,p);% it generates 16 elements
% i want to select one element of the field and then multiply all the elements of the field one by one with that element
for i=1:16
a_1(i)=gfmul(5,i,field1); % here I am getting error
First Question is how to multiply selected field element with the rest of the elements
My second question is when I select any random element of Galois field by using
field1(4) it gives incorrect answer

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