Create persons_above.m : compute if > treshhold

persons_above computes for each unique person if they are above the treshhold at a given day.

% OUTPUT:: PersonID_x_AboveAtExam : Returns a unique_persons by
% first_date_of_mesure_to_last_date_of_mesure matrix with value 1 if above
% the treshhold and 0 else.
% INPUT::
% persons: a vector of cells of personID strings,
% vector_mesure: a vector of numeric values, where value at row x
% corresponds to person at row x.
% date_mesure: a vector of dates in integer form, where value at row x
% corresponds to mesure at row x.
% treshhold: a treshhold above which the state is 1.