R help - Apr 2018 - Obtain gradient at multiple values for exponential decay model

> Sent: Friday, April 06, 2018 at 4:53 AM
> From: "Jeff Newmiller" <jdnewmil at dcn.davis.ca.us>
> To: "g l" <gnulinux at 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.

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 at gmx.com>
wrote:
>> Sent: Friday, April 06, 2018 at 4:53 AM
>> From: "Jeff Newmiller" <jdnewmil at dcn.davis.ca.us>
>> To: "g l" <gnulinux at 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.

> Sent: Friday, April 06, 2018 at 1:44 PM
> From: "Jeff Newmiller" <jdnewmil at dcn.davis.ca.us>
>
> 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.
Yes, sorry for the mistake.

coef(graphmodeld)
   (Intercept) graphdata[, 1] 
   4.513544204   -0.006820623

This corresponds to the linear model but it is still not understood how this
helps to determine gradients at specific points for the exponential model.