Unrecognized function or variable 'Newton_Starbucks'.

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Varun
Varun 2023-2-1
回答： the cyclist 2023-2-1
Ran in:
T0 = 140; %intial temperature of the body
T20 = 80; %temperature of the body after 20 minutes
TR = 22; %temperature of the air
tspan = [0 35]
tspan = 1×2
0 35
[t,T] = ode45(@Newton_Starbucks,tspan,T0)
Unrecognized function or variable 'Newton_Starbucks'.

Error in odearguments (line 92)
f0 = ode(t0,y0,args{:}); % ODE15I sets args{1} to yp0.

Error in ode45 (line 107)
odearguments(odeIsFuncHandle,odeTreatAsMFile, solver_name, ode, tspan, y0, options, varargin);

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采纳的回答

the cyclist
the cyclist 2023-2-1
I searched the internet for "Newton_Starbucks". The only link I found was this one. If that's relevant, then it seems to me that you need to define
function Tprime=Newton_Starbucks(t,T)
r=.001;
T_ambient=75;
Tprime=-r*(T-T_ambient);
end
and make sure your code can find it.
Next time you post a question, I suggest you read this guide about how to ask a good question.

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