how to view struct with fields?

syms x(t) y(t) v(t) m c g s=symengine disp ('1)------------------------------------------') cond1=x(0)==0; cond2=diff(x,t)==0; conds=[cond1 cond2] dx=diff(x,t); dx2=diff(x,t,2); dv=diff(v,t); dx2=diff(x,t,2); ode=m*diff(v,t)+c*v==m*g

Sol=solve(ode,conds,dx,x)

[madhan ravi]

Answer 1

[Ameer Hamza]

You can access the fields of a struct using dot notation. For example

Sol.c
Sol.g

Also, since you are trying to solve a differential equation, use dsolve(),

Sol=dsolve(ode,conds)

[madhan ravi]

but still I cannot find the result I wanted :/

[madhan ravi]

[madhan ravi]

[Ameer Hamza]

It is not clear which differential equation you are trying to solve. Can you clearly specify the required equations.

[madhan ravi]

I want to solve m(dx.^2/dt.^2)+c(dx/dt)=m*g; where m = mass, c=air resistance , g=acceleration due to gravity , x=distance travelled , x(0)=0, dx/dt(0)=0.

[Ameer Hamza]

You can solve this equation as follow

syms x(t) m c g
disp ('1)------------------------------------------') 
dx = diff(x);
cond1=x(0)==0; 
cond2=dx(0)==0;
conds=[cond1 cond2];
ode = m*diff(x,2) + c*diff(x) == m*g;
Sol=dsolve(ode,conds)
Sol =
 (g*m*t)/c - (g*m^2)/c^2 + (g*m^2*exp(-(c*t)/m))/c^2

[madhan ravi]

Thank you so much you are great

[Ameer Hamza]

You are welcome.

Answer 2

[madhan ravi]