matlab not using the variable i give it in differential equation

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Ej
Ej 2022-10-3
编辑： Torsten 2022-10-3
i try giving matlab values for my variable but it does not use them.
>> syms k N t
>> k = 0.025;
>> N = 1000;
>> dsolve('DP=k*P*(1-(P/N))', 'P(0)=200')
ans =
N/(exp(log(N/200 - 1) - k*t) + 1)
How do i get it to give me the same equation but with the values if k and N plugged in

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回答（1 个）

Torsten
Torsten 2022-10-3
编辑：Torsten 2022-10-3
Ran in:
syms k N t P(t)
knum = 0.025;
Nnum = 1000;
sol = simplify(dsolve(diff(P,t)==k*P*(1-(P/N)), P(0)==200))
sol = 
sol = subs(sol,[k N],[knum,Nnum])
sol = 

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