Dis.m

%%
%  Copyright 2013 Jacek B. Krawczyk and Alastair Pharo
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%  Licensed under the Apache License, Version 2.0 (the "License");
%  you may not use this file except in compliance with the License.
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%      http://www.apache.org/licenses/LICENSE-2.0
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function Beta=Dis(DiscountRate,TimeStep)
% This function computes the discount factor. It is called by InfSim.

Beta=exp(-(DiscountRate*TimeStep));