bpdn_obj.m

来自「％ Atomizer Main Directory, Version .802 」· M 代码 · 共 23 行

function [obj,grad,hess] = BPDN_obj( x )
%        [obj,grad,hess] = BPDN_obj( x )
%    computes the objective value, gradient and diagonal Hessian
%    of the linear function lambda e'x, where lambda is stored in
%    global PDSlambda, and e is a vector of 1s.
%    For use with BPDN_Interior2.m (which uses pdsco.m).

%-----------------------------------------------------------------------
% 27 Sep 2000: First version of BPDN_obj.
%              Michael Saunders, SOL, Stanford University.
%-----------------------------------------------------------------------

global      PDSlambda

n    = length(x);
obj  = PDSlambda * sum(x);
grad = PDSlambda * ones(n,1);
hess = zeros(n,1);

%-----------------------------------------------------------------------
% End function BPDN_obj
%-----------------------------------------------------------------------