LabVIEW Version

[altenbach]

I think this would be roughly equivalent code for this part (input data extracted from graph defaults):

(no guarantees, because I cannot run the original because of missing subVIs).

And as has been already said, the linear fit and linear evaluation would be trivial to implement from "Base" primitives.

[altenbach]

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@altenbach wrote:

And as has been already said, the linear fit and linear evaluation would be trivial to implement from "Base" primitives.

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One possibility:

Note that you might want to implement some sanity checks on the inputs, such as verifying that [X] and [Y] have equal size. (other checks are less important, such as the presence of  at least two points and absence of NaN, +inf, -inf, etc. Violating any of these will just return NaN, which might be sufficient.)