hi , i am trying to solve differential equation by matlab and i get these
syms p(t) k p0 p15
>> p = dsolve('Dp=k*p*exp(450/p)','p(0)=40,p(15)=95','t')
Warning: Unable to find explicit solution.
> In dsolve (line 201)
and also i did this
>> syms y(t) k
ode = (diff(y,t) == k*y*exp(450/y));
cond =[ y(0) == 40, y(15) == 95];
ySol(t) = dsolve(ode,cond)
Warning: Unable to find explicit solution.
> In dsolve (line 201)
my function is
Dp=kp ln(450/p)
p(0)=40 and p(15)=95 , k is constant
can someone help please, i am new to MATLAB

 

... suggest getting the sample problem in the following link to work, then modify as needed.:
https://www.mathworks.com/help/symbolic/dsolve.html

 

... suggest getting the sample problem in the following link to work, then modify as needed.:
https://www.mathworks.com/help/symbolic/dsolve.html

Thanks for your help, i did follow the instruction and i still get this warning
syms y(t) a
eqn = diff(y,t) == a*y*exp(450/y);
cond = [y(0)==40, y(15)==95];
ySol(t) = dsolve(eqn,cond)
Warning: Unable to find explicit solution.
> In dsolve (line 201)

 

i have to use ode45 but the solution is not right , so what is wrong(i have 2 initial conditions and one constant k , did i write these initial condition and constant right in MATLAB?
tspan = [0 300];
y0 = 40;y15=95;
[t,y] = ode45(@(t,y) 'k'*y*exp(450/y), tspan, y0,y15);
plot(t,y,'-o')

 

Please state the correct differential equation that you need to solve.

 

Please state the correct differential equation that you need to solve.

dy/dt=k*y*ln(450/y)
y(0)=40 and y(15)=95 and k is constant
Thanks

 

One thing to test or try out ...
If you are able to take the derivative of your first order original equation, that should yield a second order differential equation, which may be more acceptable to Matlab.
If so far, you have all the syntax correct, then maybe that would be something to try.