for loop - MATLAB symsum() function -


i having trouble getting code work symsum() work. don't know if because variables matrices or else. error getting following:

"invalid indexing or function definition. when defining function, ensure arguments symbolic variables , body of function sym expression. when indexing, input must numeric, logical, or ':'. "

any appreciated!

syms k  x =4 = zeros(4,4) b = [1 1 1 1]'  = 1:1:x     a(i,i) = symsum(b(k),k,1,4)  end


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