Unable to update while loop condition

To helpers out there, I am trying to implement a price negotiation algorithm on Matlab but unable to converge the code as the while loops value is not updating. The Oij_k1 value is the output of the while loop which updates in the end of the loop and runs back up as an input to compare the difference with Oij_k.

%% SELLER NEGOTIATION

close all

clc

%% Constants for Calculations

tol = 0.001;

Tij = 0.54;

u_Lambda_i = 0.1;

u_g_i = 0.1;

u_p_i = 0.01;

k=1;

Klim=30;

%% Conditions for sellers

alpha_i = 0.11;

beta_i = 6.1;

gi_k = 0.9;

gi_k16a = zeros();%updates later

Pi = 0;%min power of seller ALWAYS ZERO

Oij_k = [5 12.68];%calculated

Oij_k1 = zeros(1,2);%;FINAL OFFER TO SEND TO BUYER

Lambda_ij_k = 12.68;%Eqn on top in sellers

Pij_k = 5;%max power of seller

%% Conditions for buyers

alpha_j = 0.21;

beta_j = 14.2;

gj_k = 0.5;

Pji_k = 1;%min power of buyer

Lambda_ji_k = -(alpha_j*Pji_k)+beta_j*(1-gi_k)-Tij;%2.2

%% Equations

Pij_k11 = zeros();

Pij_k15a = zeros();

Pij_k17 = zeros();

Lambda_ijr_k= zeros();%9a

Lambda_ij_k11 = zeros();%11

Lambda_ij_k14 = zeros();%14

Lambda_ij_k15a = zeros();%15a

Lambda_ij_k17 = zeros();%17

Offer11 = zeros(1,2);

Offer15a = zeros(1,2);

Offer17 = zeros(1,2);

%%

while max(abs(Oij_k1-Oij_k))<tol || (k<Klim)

% RECEIVE O_JI_K FROM BUYER

%keyboard

Lambda_ijr_k=(alpha_i*Pji_k)+beta_i*(1+gi_k)+Tij;%9a

if abs(Lambda_ijr_k-Lambda_ji_k)<tol % 11

Pij_k11 = max(Pi,Pji_k);%11

Lambda_ij_k11=(alpha_i*Pij_k11)+beta_i*(1+gi_k)+Tij;%11

else

if abs(Pij_k-Pji_k)<tol

if Lambda_ji_k>=Lambda_ij_k

Lambda_ij_k14=(Lambda_ij_k+Lambda_ji_k)/2;%14

else

Lambda_ij_k15a=max(Lambda_ijr_k,Lambda_ij_k-u_Lambda_i);%15a

end

Pij_k15a = Pji_k;%FIX THESE TWO

gi_k1 = gi_k;%AND THIS

end

gi_k16a=max(0,gi_k-u_g_i);%16a

Pij_k17=max(Pi,Pij_k-u_p_i*(Pij_k-Pji_k));%17

Lambda_ij_k17=(alpha_i*Pij_k17)+beta_i*(1+gi_k16a)+Tij;%17

end

k=k+1;

if Lambda_ij_k11> 0

Offer11(2) = Lambda_ij_k11;

Offer11(1) = Pij_k11;

end

if Lambda_ij_k15a> 0

Offer15a(2) = Lambda_ij_k15a;

Offer15a(1) = Pij_k15a;

end

if Lambda_ij_k17> 0

Offer17(2) = Lambda_ij_k17;

Offer17(1) = Pij_k17;

end

offers = [Offer11;Offer15a;Offer17]

Oij_k1 = max(offers)

Pji_k = Oij_k1(1);

Lambda_ji_k = Oij_k1(2);

%keyboard

end

disp ([Offer11])

disp ([Offer15a])

disp ([Offer17])

Answer 1

[David Hill]

Oij_k1=[1 1];%need to define before using
while max(abs(Oij_k1-Oij_k))>tol  || (k<Klim)%I believe you want >tol

[Mohamed Kamruddin]

I did define the Oij_k1 = zeros (1,2) so that it could be updated later

Also, >tol does not take the iteration (k<Klim) into account

Answer 2

[David Hill]

Not sure what your question is then. The following works just fine for me.

while max(abs(Oij_k1-Oij_k))>tol  && (k<Klim)