function y=lambdak(u,k);%LAMBDAK Evaluate lambda function for Affine Wigner distribution.%	Y=LAMBDAK(U,K) evaluates the parametrization lambda function%	involved in the affine smoothed pseudo Bertrand distribution.%	%	 LAMBDAK(U,0) = -U/(exp(-U)-1) for K = 0%	 LAMBDAK(U,1) = exp(1+U exp(-U)/(exp(-U)-1)) for K = 1%	 LAMBDAK(U,K) = (K (exp(-U)-1)/(exp(-KU)-1))^(1/(K-1)) otherwise%%	U : real vector%	Y : value of LAMBDAD at point(s) U%%	See also LAMBDAB, LAMBDAU, LAMBDAD.%	P. Goncalves, October 95%	Copyright (c) 1995 Rice University%%	------------------- CONFIDENTIAL PROGRAM -------------------- %	This program can not be used without the authorization of its%	author(s). For any comment or bug report, please send e-mail to %	f.auger@ieee.org if (k~=0) & (k~=1)  ind = find(u ~= 0) ;  y = ones(size(u)) ;  y(ind) = (k*(exp(-u(ind))-1)./(exp(-k*u(ind))-1)).^(1/(k-1)) ;elseif k==0  ind = find(u ~= 0) ;  y = ones(size(u)) ;  y(ind) = -u(ind)./(exp(-u(ind))-1) ;elseif k==1  ind = find(u ~= 0) ;  y = ones(size(u)) ;  y(ind) = exp(1+u(ind).*exp(-u(ind))./(exp(-u(ind))-1)) ;end;