Date: Dec 5, 2012 4:36 AM
Author: mado
Subject: programming error

I have two constants K1 and K2 I need them to be different because i have breaking point 

function [e,Pm,Ip] = new(In,Vn)

persistent Ipold K1 ;
if isempty(Ipold)
Ipold=2; %initialized only once in the beginning
end
if isempty(K1)
K1=2; %initialized only once in the beginning
end

K1=5;
K2=.19;
Pn= Vn*In
Pm=100*In
e= Pn-Pm
if e<0
Ip = Ipold+K2 *e
else
Ip = Ipold+K1 *e
end

gave error message
Trouble solving algebraic loop containing 'che/Guess' at time 0. Stopping simulation. There may be a singularity in the solution. If the model is correct, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances)

I can't understand what is the objection ?