phibar

PURPOSE

log-penalty barrier function, t can be a scalar/vector/...

SYNOPSIS

function [ret] = phibar(obj,t)

DESCRIPTION

 log-penalty barrier function, t can be a scalar/vector/...

CROSS-REFERENCE INFORMATION

This function calls:

This function is called by:

penlab PenLab (Pennon Laboratory for Matlab, previously PennonM)

SOURCE CODE

0001 function [ret] = phibar(obj,t)
0002 % log-penalty barrier function, t can be a scalar/vector/...
0003 %
0004 
0005   ret=t;    % otherwise the result would be a column vector
0006   ind = find(t<0);
0007   invind = find(t>=0);
0008   ret(invind) = Inf;
0009   ret(ind) = -log(-t(ind));
0010   return;
0011