[R] Obtain gradient at multiple values for exponential decay model

[Jeff Newmiller]

You did not try my suggestion. You tried David's, which has a leftover mistake from your guesses about what the argument to coef should be.
-- 
Sent from my phone. Please excuse my brevity.

On April 6, 2018 3:30:10 AM PDT, g l <gnulinux using gmx.com> wrote:
>> Sent: Friday, April 06, 2018 at 4:53 AM
>> From: "Jeff Newmiller" <jdnewmil using dcn.davis.ca.us>
>> To: "g l" <gnulinux using gmx.com>
>> coef( graphmodeld )
>> 
>
>coef(graphmodelp)
>Error: $ operator is invalid for atomic vectors
>
>A quick search engine query revealed primarily references to the dollar
>sign ($) operator which does not seem relevant to this question.