Error in ode45 (line 115) and odearguments (line 90)

Hello all together,

I have written the following code, but it keeping getting the same error:

function dydt=overwork(t,y,re,rr,oe,or,be,br,ae,ar)
dydt=zeros(2,1);
dydt(1)=y(1)*(1-y(1))*(y(2)*(oe*re-be*rr)-ae*re);
dydt(2)=y(2)*(1-y(2))*((y(1)*(or*rr-br*re)-ar*rr);
end

clc; 
clear;  
re=5;
rr=5;
oe=0.7;
or=0.7;
be=0.2;
br=0.2;
ae=0.4;
ar=0.2; 
figure(1)
[t,y]=ode45(@(t,y) overwork(t,y,re,rr,oe,or,be,br,ae,ar),[0,20],[0.1,0.5]);
plot(y(:,1),y(:,2),'rh-','linewidth',1,'markersize',5,'markerfacecolor','r','markerindices');
grid on
hold on 
xlabel('$x$','interpreter','latex','Rotation',0);
ylabel('$y$','interpreter','latex','Rotation',360);

Error in odearguments (line 90)
f0 = feval(ode,t0,y0,args{:});   % ODE15I sets args{1} to yp0.

Error in ode45 (line 115)
  odearguments(FcnHandlesUsed, solver_name, ode, tspan, y0, options, varargin);

Error in overwork2 (line 12)
[t,y]=ode45(@(t,y) overwork(t,y,re,rr,oe,or,be,br,ae,ar),[0,20],[0.1,0.5]);

Can somebody help me?

Thanks in advance and best regards to you all.

Answer 1

[Star Strider]

There were two errors.

First:

dydt(2)=y(2)*(1-y(2))*((y(1)*(or*rr-br*re)-ar*rr);

↑ ← EXTRA UNMATCHED PARENTHESIS

Second:

In the plot call, 'markerindices' has a name although no associated values, throwing an error. (I deleted it.)

re=5;
rr=5;
oe=0.7;
or=0.7;
be=0.2;
br=0.2;
ae=0.4;
ar=0.2; 
figure(1)
[t,y]=ode45(@(t,y) overwork(t,y,re,rr,oe,or,be,br,ae,ar),[0,20],[0.1,0.5]);
plot(y(:,1),y(:,2),'r-','linewidth',1,'markersize',5,'markerfacecolor','r');
grid on
hold on 
xlabel('$x$','interpreter','latex','Rotation',0);
ylabel('$y$','interpreter','latex','Rotation',360);

function dydt=overwork(t,y,re,rr,oe,or,be,br,ae,ar)
dydt=zeros(2,1);
dydt(1)=y(1)*(1-y(1))*(y(2)*(oe*re-be*rr)-ae*re);
dydt(2)=y(2)*(1-y(2))*(y(1)*(or*rr-br*re)-ar*rr);
end

With those corrections, it works!

.

[jhdueon]

the "EXTRA UNMATCHED PARENTHESIS" really matters!! Thanks!!

[Star Strider]

As always, my pleasure!

.