plotting confidence bands from predict.nls

How do you use bootstrap to estimate the confidence as well as the prediction
intervals in nonlinear regression ?

With difficulty!

There is far too little here to go on, and this seems an odd question 
unless it is homework (why dictate a problem-strewn method of solution 
if this is a real problem?)

The real issue is how to bootstrap nonlinear regression, and you will 
find that discussed in all good books on the subject, such as Venables & 
Ripley and Davison & Hinkley.  It is not trivial and the solutions are 
not altogether satisfactory ....

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Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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