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Highlights from
INTSOLVER: An interval based solver for Global Optimization

from INTSOLVER: An interval based solver for Global Optimization by Tiago Montanher
Interval based functions to solve small global optimization problems with guaranteed bounds.

sibranin(type)
function inidata = sibranin(type)
% Branin problem initial data. 
% Set type equal 0 to get double initial data.
% Set type equal 1 to get interval initial data.

  if type == 0
   inidata = [0 0];
  end
  
  if type == 1
   inidata = [infsup(-5, 10) infsup(0, 15)];
  end
end

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