please help me to find the resultant torque for 4 cylinder engine by find the resultant figure

this my code

clc

clear

k=1.4;

psi=14.5; % pressure angle of pinion teeth

N=2000; % rotational speed of engine

w=(N/60)*2*pi;

patm = 101325; % atmospheric pressure

pmax=(patm*100); % maximum pressure = 100 atmospheres

vc=0.05*10^(-3); % convert clearance volume in m^3

stroke = 127*10^(-3); % in m

bore = 100*10^(-3); % piston bore in m

area=(bore^(2))*pi/4; % calculate cross sectional area in m^3

dispvol = area*stroke; % calculate displacement volume

r=63.5* 10^(-3); % Radius of crankshaft in m

l=0.23; % length of the connecting rode in m

m1=0.6; % mass of the piston in kg

m2=0.8; % mass of the connecting rod

m3=0.5*m2+m1; % equivalent mass of the reciprocating parts

theta1=0:1:180;

for ac=1:length(theta1);

intake(ac)= 0.9*patm;% pressure during intake stroke

t1(ac)=intake(ac)*area*r*sind(theta1(ac))*(l+(r*cosd(theta1(ac))/l)); % torque during intake stroke

end

theta2=180:1:360;

for ac=1:length(theta2);

x(ac)=r*cosd(theta2(ac))+((l^(2))-(r^(2))*(sind(theta2(ac)))^(2))^(0.5);

vol(ac)=vc+area*(r+l-x(ac));

c(ac)=0.5*patm*((vc+dispvol)/(vol(ac)))^k % pressure during compression stroke

t2(ac)=c(ac)*area*r*sind(theta2(ac))*(l+(r*cosd(theta2(ac))/l));% torque during compression stroke

end

theta3=360:1:540;

for ac=1:length(theta3);

x(ac)=r*cosd(theta3(ac))+(l^(2)-r^(2)*(sind(theta3(ac)))^(2))^(0.5);

vol(ac)=vc+area*(r+l-x(ac));

p(ac) = pmax*(vc/vol(ac))^k; % pressure during power stroke

t3(ac)=p(ac)*area*r*sind(theta3(ac))*(l+(r*cosd(theta3(ac))/l)); % torque during power stroke

end

theta4=540:1:720;

for ac=1:length(theta4);

e(ac) = 1.1*patm; % pressure during exhaust stroke

t4(ac)=e(ac)*area*r*sind(theta4(ac))*(l+(r*cosd(theta4(ac))/l)); % torque during exhaust stroke

end

figure(1); % torque-angle diagram

plot(theta1,t1,'k',theta2,t2,'k',theta3,t3,'k',theta4,t4,'k','linewidth',2.5)

xlabel('Angle of crank in degrees');

ylabel('Transmitted torque in (N.m)');

grid

figure(2); % torque-angle diagram for 2 cylinder engine

plot(theta1,t1,'k',theta2,t2,'k',theta3,t3,'k',theta4,t4,'k','linewidth',2.5)

xlabel('Angle of crank in degrees');

ylabel('Transmitted torque in (N.m)');

hold on

plot(theta1+360,t1,'r',theta2+360,t2,'r',theta3+360,t3,'r',theta4+360,t4,'r','linewidth',2.5)

grid

figure(3); % torque-angle diagram for 3 cylinder engine

plot(theta1,t1,'k',theta2,t2,'k',theta3,t3,'k',theta4,t4,'k','linewidth',2.5)

xlabel('Angle of crank in degrees');

ylabel('Transmitted torque in (N.m)');

hold on

plot(theta1+120,t1,'r',theta2+120,t2,'r',theta3+120,t3,'r',theta4+120,t4,'r','linewidth',2.5)

hold on

plot(theta1+240,t1,'b',theta2+240,t2,'b',theta3+240,t3,'b',theta4+240,t4,'b','linewidth',2.5)

grid

figure(4); % torque-angle diagram for 4 cylinder engine

plot(theta1,t1,'k',theta2,t2,'k',theta3,t3,'k',theta4,t4,'k','linewidth',2.5)

xlabel('Angle of crank in degrees');

ylabel('Transmitted torque in (N.m)');

hold on

plot(theta1+90,t1,'r',theta2+90,t2,'r',theta3+90,t3,'r',theta4+90,t4,'r','linewidth',2.5)

hold on

plot(theta1+180,t1,'b',theta2+180,t2,'b',theta3+180,t3,'b',theta4+180,t4,'b','linewidth',2.5)

hold on

plot(theta1+270,t1,'r',theta2+270,t2,'r',theta3+270,t3,'r',theta4+270,t4,'r','linewidth',2.5)

grid

figure (4)