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SetFctLinComb.m
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SetFctLinComb.m
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classdef SetFctLinComb < SetFct
% Creates a linear combination of set functions F = sum_i Fs{i}*weights(i)
properties
Fs = {};
weights = 1;
end
methods
function F = SetFctLinComb(Fs, weights)
F.Fs = Fs;
F.weights = weights;
end
function [val, F] = obj(F, A)
if isequal(A, F.current_set)
val = F.current_val;
else
val = 0;
for i=1:length(F.Fs)
[vali, F.Fs{i}] = obj(F.Fs{i}, A);
val = val + F.weights(i)*vali;
end
F.current_set = A;
F.current_val = val;
end
end
function [new_val, F] = add(F, A, e)
[val, F] = F.obj(A);
if ismember(e, A)
new_val = val;
else
new_val = 0;
for i=1:length(F.Fs)
[new_vali, F.Fs{i}] = add(F.Fs{i}, A, e);
new_val = new_val + F.weights(i)*new_vali;
end
F.current_set = union(A,e);
F.current_val = new_val;
end
end
function [new_val, F] = rmv(F, A, e)
[val, F] = F.obj(A);
if ~ismember(e, A)
new_val = val;
else
new_val = 0;
for i=1:length(F.Fs)
[new_vali, F.Fs{i}] = rmv(F.Fs{i}, A, e);
new_val = new_val + F.weights(i)*new_vali;
end
F.current_set = setdiff(A,e);
F.current_val = new_val;
end
end
end
end