I have some data fit to a smooth.spline object as follows: (x=vector of data
for the predictor variable, y=vector of data for the response variable)

fit <- smooth.spline(x,y)

Now, given a spline fit point y_new, I want to be able to find out what
value of x_new yielded this fit value. How to do so?
(This problem is the inverse of the predict.smooth.spline function, which
takes x_new as input and yields the corresponding y_new fit value)

Any insight is much appreciated!

Thanks,
Kavitha

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