function e = entering(t,otb)
%
%  returns the variable not in the basis which will enter.
%
%  on entry:
%    t         linear programming problem in standard format;
%    otb       variables outside the basis.
%
%  on return:
%    e         column in t, corresponding to entering variable.
%
n = length(otb);
e = 0;
max = 0;
for i=1:n
  if t(1,otb(i)) > max
    e = otb(i);
    max = t(1,e);
  end;
end;