How to set up a function

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Christian Neumann
Christian Neumann on 28 May 2021
Edited: Torsten on 29 May 2021
Hi, how am I supposed to get the function working and typed in Matlab?
All of the variables are known except for V(t')dt'. This one should be integrated in a 200 seconds (t) period.
Well, I got some experience with coding but I really got no idea how to start with this. Thanks in advance!

Answers (2)

Sulaymon Eshkabilov
Sulaymon Eshkabilov on 28 May 2021
There are a few built-in functions of integral in MATLAB, such as int() - symbolic, integral(), quad() - numerical integration.
Or you can write your own code of mid-point, Trapezoidal, or other methods.
One important point here is the expression of V has to be pre-defined.
Good luck.

Torsten on 28 May 2021
Edited: Torsten on 29 May 2021
Differentiating your equation with respect to t gives the differential equation
V'(t) = Qdot/(m*R_s*T) * V(t)
with solution
V(t) = V0*exp(Qdot/(m*R_s*T) * t)
With this explicit function definition for V, you can easily plot it.

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