Having a system of three odes
I put the odes in a function and the script to solve the given function
I'm getting NaN for output of ode45
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function dx=funF7(t,x)ft_to_m=0.3048; lb_to_kg=0.45359273;S=213.8264*ft_to_m^2; m=22900*lb_to_kg; CD=1.34721248450636; CL=0.387532621392346; phi1=0;rho_0=1.226; beta=0.1387/1000; R_Earth=6378000; %State variables
r=x(1);V=x(2);gamma=x(3);h=r-R_Earth; rho=rho_0*exp(-beta*h); %Nonlinear equations with recpect to time
q=(V^2*rho)/2; L=q*S*CL/m; D=q*S*CD/m; %Equations of motion
dx=zeros(3,1); dx(1)=V*sin(gamma);dx(2)=-D/cos(phi1) - sin(gamma)/r^2;dx(3)=L/V + V*cos(gamma)/r - cos(gamma)/r^2/V;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Solver
clc; clear all step_size1=0.0004;r0=0.3256;V0=2.4741;gamma0=-0.1027;x0=[r0 V0 gamma0];tspan=[0 0.1];options = odeset('MaxStep',step_size1);[tt xx]= ode45(@funF7,tspan,x0,options);%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%Any help would be much appreciated. Thanks in advance!
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