How to set up a function

Question

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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!

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Answer 1

Sulaymon Eshkabilov 2021-5-28

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Hi,

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.

Answer 2

Torsten 2021-5-28

编辑：Torsten 2021-5-29

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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.