Replacing Variable in an ODE
显示 更早的评论
syms T(t)
ode = diff(T,t) == (Lemda-(Sigma.*T));
cond = T(0) == To;
Solution = dsolve(ode, cond)
ERRORS; (Not replacing with a variable)
Undefined function or variable 'Lemda'.
Error in Project (line 11)
ode = diff(T,t) == (Lemda-(Sigma.*T));
4 个评论
SALAH ALRABEEI
2021-6-13
编辑：SALAH ALRABEEI
2021-6-13
Are Lamda and sigma constants or vaiables!
Walter Roberson
2021-6-13
It does not matter. dsolve() is for symbolic expressions, so we can create symbolic variables without caring about whether they will later be constants or later will be changed.
Fahad Ramzan
2021-6-13
SALAH ALRABEEI
2021-6-13
Thanks Walter.
采纳的回答
syms T(t) Lemda Sigma To
ode = diff(T,t) == (Lemda-(Sigma.*T));
cond = T(0) == To;
Solution = dsolve(ode, cond)
1 个评论
Fahad Ramzan
2021-6-13
Are these answers the same? Because the solution goes this way where i made assumptions as following
%Assumptions
% Lemda = constant input source of uninfected cells per day
% Sigma = normal loss rate constant of uninfected cells
% Beta = infection rate constant of uninfected cells per infected cell
% Mu = loss rate constant of infected cells
% Gamma = loss rate constant of free virus
% N = number of virions produced per day per infected cell
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