Displaying 5 results from an estimated 5 matches for "cvalue100".
2018 Apr 05
4
Obtain gradient at multiple values for exponetial decay model
> Sent: Thursday, April 05, 2018 at 4:40 PM
> From: "Jeff Newmiller" <jdnewmil at dcn.davis.ca.us>
>
> the coef function.
>
For the benefit of other novices, used the following command to read the documentation:
?coef
Then tried and obtained:
> cvalue100<-coef(graphmodelp~100)
> cvalue100
NULL
Then looked at the model values which of course correspond to original non-modelled values.
graphmodelp
1 2 3 4 5 6 7 8
91.244636 69.457794 52.873083 40.248368 30.638107 23.322525 17.753...
2018 Apr 05
2
Obtain gradient at multiple values for exponetial decay model
Readers,
Data set:
t,c
0,100
40,78
80,59
120,38
160,25
200,21
240,16
280,12
320,10
360,9
400,7
graphdata<-read.csv('~/tmp/data.csv')
graphmodeld<-lm(log(graphdata[,2])~graphdata[,1])
graphmodelp<-exp(predict(graphmodeld))
plot(graphdata[,2]~graphdata[,1])
lines(graphdata[,1],graphmodelp)
Please what is the function and syntax to obtain gradient values for the model curve at
2018 Apr 05
0
Obtain gradient at multiple values for exponetial decay model
This smells like homework, which the Posting Guide indicates is off topic.
I am not aware of "the function" that will solve this, but if you know what a gradient is analytically then you should be able to put together a solution very similar to the code you already have with the addition of using the coef function.
--
Sent from my phone. Please excuse my brevity.
On April 5, 2018
2018 Apr 06
0
Obtain gradient at multiple values for exponetial decay model
...t 4:40 PM
>> From: "Jeff Newmiller" <jdnewmil at dcn.davis.ca.us>
>>
>> the coef function.
>>
>
>For the benefit of other novices, used the following command to read
>the documentation:
>
>?coef
>
>Then tried and obtained:
>
>> cvalue100<-coef(graphmodelp~100)
>> cvalue100
>NULL
>
>Then looked at the model values which of course correspond to original
>non-modelled values.
>
>graphmodelp
>1 2 3 4 5 6 7 8
>
>91.244636 69.457794 52.873083 40.2...
2018 Apr 06
0
Obtain gradient at multiple values for exponetial decay model
...:40 PM
>> From: "Jeff Newmiller" <jdnewmil at dcn.davis.ca.us>
>>
>> the coef function.
>>
>
> For the benefit of other novices, used the following command to read the documentation:
>
> ?coef
>
> Then tried and obtained:
>
>> cvalue100<-coef(graphmodelp~100)
>> cvalue100
> NULL
Should have been:
coef(graphmodelp)
>
> Then looked at the model values which of course correspond to original non-modelled values.
>
> graphmodelp
> 1 2 3 4 5 6 7...