i am getting problem to define 'symsum' for this code in which Cmxk matrix to be genarated from a matrix Bmxk .Any help will be appreciated.

for m=1:100 % fork=1:40 %

% for m=1 % for k=1:40 % % C(m,k)=sqrt(20*50).*B(m,k)/(20*50.*symsum(B(m,k),k,1,40)+1);% % end; % end;