Paola,
It sounds like one or both of your exponents (v2_h and v5_h) are getting
too large. I tried fitting the model without those exponents, then I used
the estimates from that simpler model as starting parameters for the full
model, and it worked.
nov2hv5h <- nls(slope_pp2_mrna ~ ( (k1*v2_K
Suggestion: read the posting guide and tell us enough information to interpret
your problem.
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