Re: [R] Nonlinear regression

2017-12-20 Thread Timothy Axberg
Thank you! I didn't realize I wasn't linearizing it correctly. This was very helpful. -Timothy On Tue, Dec 19, 2017 at 10:29 PM, Berwin A Turlach wrote: > G'day Timothy, > > On Tue, 19 Dec 2017 18:28:00 -0600 > Timothy Axberg wrote: > > > Should I repost t

Re: [R] Nonlinear regression

2017-12-19 Thread Timothy Axberg
Should I repost the question with reply-all? On Tue, Dec 19, 2017 at 6:13 PM, Jeff Newmiller wrote: > You also need to reply-all so the mailing list stays in the loop. > -- > Sent from my phone. Please excuse my brevity. > > On December 19, 2017 4:00:29 PM PST, Timothy Axberg

[R] Nonlinear regression

2017-12-19 Thread Timothy Axberg
Hello, I am working on a small data set and trying to find values of Qmax and Kl for the equation qe = (Qmax * Kl * ce) / (1 + 𝐾l* ce) I found my Qmax and Kl through the linear model butam now trying to find them through the "nls" function however an error comes up that I am unfamiliar with. I ha

[R] Partial differential equation

2017-12-18 Thread Timothy Axberg
Hello, I am having troubles with heat conduction problem. Below is the given information. Should I move forward with this problem like any other 1-D PDE? ¶T/¶t = a* (¶^2T/¶x^2) I.C. For t = 0 and 0 £ x £ 10, T = 0 °C B.C. For x = 0 cm and all t , T = 100°C For x = 10 cm and all t , T = 0 °C