[R] Non-linear regression

[kupz]

So I have a data set I would like to model using a non-linear method. I know
it should be an exponential decay. However I know what the first derivative
of the equation should be at two points, x=0 and x=100. Is there anyway to
establish this when inputing the model or how would one go about this before
the nls statement....

-Thanks, 
Matt
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