My best guess is that the code you were copying
was from an objective (fitted) function that computed
the gradient itself, so the "predict" result had
a "gradient" attribute. Here's an alternative that
(I think) works OK, but it comes with the usual
warranty (none).
## simulate "data"
O.age =
I have data that looks like
O.lengthO.age
176 1
179 1
182 1
...
493 5
494 5
514 5
606 5
462 6
491 6
537 6
553 6
432 7
522 7
625 8
661 8
687 10
704 10
615 12
(truncated)
with a simple VonB growth model from within nls():
plot
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