b2f.m

经典遗传算法工具箱中的二进制转浮点数程序

function [fval] = b2f(bval,bounds,bits)
% function [fval] = b2f(bval,bounds,bits)
%
% Return the float number corresponing to the binary representation of bval.
%
% fval   - the float representation of the number
% bval   - the binary representation of the number
% bounds - the bounds on the variables
% bits   - the number of bits to represent each variable

% Binary and Real-Valued Simulation Evolution for Matlab 
% Copyright (C) 1996 C.R. Houck, J.A. Joines, M.G. Kay 
%
% C.R. Houck, J.Joines, and M.Kay. A genetic algorithm for function
% optimization: A Matlab implementation. ACM Transactions on Mathmatical
% Software, Submitted 1996.
%
% This program is free software; you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation; either version 1, or (at your option)
% any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
% GNU General Public License for more details. A copy of the GNU 
% General Public License can be obtained from the 
% Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

scale=(bounds(:,2)-bounds(:,1))'./(2.^bits-1); %The range of the variables
numV=size(bounds,1);
cs=[0 cumsum(bits)];   % %cumsum:求和cumsum(x,1)对矩阵x的列求和，cumsum(x,2)对行求和
for i=1:numV
  a=bval((cs(i)+1):cs(i+1));
  fval(i)=sum(2.^(size(a,2)-1:-1:0).*a)*scale(i)+bounds(i,1);
end