Vinf=[2.7 4 6 8];
mu_m=42828;
R_msoi=.576e6;

[afas,efas,pfas]=parasint(Vinf);

an_vera0=zeros(1,length(Vinf));
Vr0=zeros(1,length(Vinf));
Vt0=zeros(1,length(Vinf));

for j=1:length(Vinf)

    c_tstar0=(1/efas(j))*((pfas(j)/R_msoi)-1);
    an_vera0(j)=-acos(c_tstar0);
    s_tstar0=sin(an_vera0(j));
    Vr0(j)=sqrt(mu_m/pfas(j))*efas(j)*s_tstar0;
    Vt0(j)=sqrt(mu_m/pfas(j))*(1+efas(j)*c_tstar0);

end

ti=time(an_vera0,efas,afas,mu_m);

for n=1:length(ti)

    I=(0:3600:ti(n));
    options=odeset('Vectorized','on','RelTol',1e-8,'AbsTol',1e-9);
    [t,Y]=ode45(@(t,y) eqMotoCur(t,y),I,y0,options);

end

function [afas,efas,pfas]=parasint(Vinf)

mu_m=42828;
R_m=3396.2;
Rp0=R_m+400;
Rpf=R_m+50;
a0=zeros(1,length(Vinf));
e0=zeros(1,length(Vinf));
p0=zeros(1,length(Vinf));
afas=zeros(1,length(Vinf));
efas=zeros(1,length(Vinf));
pfas=zeros(1,length(Vinf));

for j=1:length(Vinf)
    a0(j)=(-mu_m)/(Vinf(j)^2);
    e0(j)=1-Rp0/a0(j);
    p0(j)=a0(j)*(1-e0(j)^2);

    c(1)=p0(j);
    c(2)=Rpf*(1-e0(j)^2);
    c(3)=Rpf*(1-e0(j)^2)-p0(j);
    Efas=roots(c);
    ind=(Efas>1 & isreal(Efas));
    efas(j)=Efas(ind);
    afas(j)=Rpf/(1-efas(j));
    pfas(j)=afas(j)*(1-efas(j)^2);
end

function [ti] = time(an_vera0,efas,afas,mu_m)

ti=zeros(1,length(an_vera0));
for j=1:length(an_vera0)
    F=2*atanh(sqrt((efas(j)-1)/(efas(j)+1))*tan(an_vera0(j)/2));
    T=sqrt((-afas(j))^3/mu_m)*(efas(j)*sinh(F) - F);
    ti(j)=-2*T;
end

function [dydt] = eqMotoCur(t,y)
R_m=3396.2;
mu_m=42828;
Cd=2.2;
S=7.065e-6;
m=3699.046;
wE=0.24117/R_m;
if abs(y(1))>R_m+250 && y(3)>0
    dydt(1:4)=0;
else
    dydt=zeros(4,1);
    dydt(1)=y(3);
    dydt(2)=y(4)/y(1);
    dydt(3)=(-mu_m/(y(1)^2))+((y(4)^2)/y(1))-(.5*Cd)*(S/m)*...
    (dens(y(1)-R_m))*(sqrt((y(3)^2)+(y(4)-(wE*y(1)))^2))*y(3);
    dydt(4)=-(y(4)*(y(3)/y(1)))-(.5*Cd)*(S/m)*...
    (dens(y(1)-R_m))*(sqrt((y(3)^2)+(y(4)-(wE*y(1)))^2))*...
    (y(4)-(wE*y(1)));
end
end

function [rho] = dens(z)

load Density.mat h d
d=d*10^9;

if any(h)==abs(z)
    j=h==abs(z);
    rho=d(j);
elseif abs(z)<250
    c_tot=(find(h>=abs(z)));
    c=c_tot(1);
    H=-(h(c)-h(c-1))/(log(d(c)/d(c-1)));
    rho=d(c-1)*exp(-(abs(z)-h(c-1))/H);
else
    rho=0;
end

end

Unable to perform assignment because the size of the left side is
4-by-2 and the size of the right side is 4-by-5.

Error in ode45 (line 488)
        yout(:,idx) = yout_new;

Error in MainCur (line 59)
        [t,Y]=ode45(@(t,y) eqMotoCur(t,y),I,y0,options);