Pendulum Error Query

[IsobelMunden]

Hello, this is some C code I inserted inside a formula node for a pendulum. It comes up with the error shown in the second screenshot, and I'm not sure what to do about it as I've copied exactly the code from a manual we were given. 

Thanks 🙂

[GerdW · Accepted solution]

Hi Isobel,

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@IsobelMunden wrote:

Hello, this is some C code I inserted inside a formula node for a pendulum. It comes up with the error shown in the second screenshot, and I'm not sure what to do about it as I've copied exactly the code from a manual we were given. 

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What about that missing variable "theta0"? It isn't defined anywhere in this formula node!

(Check the naming of the formula node input carefully…)

[IsobelMunden]

Thank you!!

[johntrich1971]

If GerdW's answer fixed your issue then you should mark it as the solution.