[R] nls not solving

[Schatzi]

I am not sure how you simplified the model to:
y = a + b(1 - exp(kl)) - b exp(-kx) 

I tried simplifying it but only got to:
y = a + b - b * exp(kl) * exp(-kx)

I agree that the model must not be identifiable. That makes sense,
especially given that removing either a or l makes the model work. Can you
please further explain the math though as I am not understanding it? I do
not see you obtained your equation and when I tried to solve using your
equation I got quite different numbers. Thank you.

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