[R] optimisation of the system of differential equations

Jeff Newmiller jdnewmil at dcn.davis.ca.us
Mon Feb 20 16:48:58 CET 2017

Go back and read the Posting Guide.

1) Missing code. Only certain types of attachments get through, and the recommendation is to include everything in the body of the email. Whatever you did,  it did not get through to us. 

2) Please make it clear what results you obtained and what results you expected. This is not the "do your research for you" mailing list, so please keep your question focused on how R does things, not on whether your theory is correct. 
Sent from my phone. Please excuse my brevity.

On February 20, 2017 7:26:43 AM PST, Malgorzata Wieteska via R-help <r-help at r-project.org> wrote:
>I try to do optimisation of the system of the differential equations.
>I've managed to make my exemplary code working, however after changing
>equations on the exact model and data on the real one, I get an error
>messages and code doesn't work.
>I have a partial data for L (concentrations were assessed only for 3
>days, the cycle lasted 24. My data for external variables
>(concentrations) of 2 other variables cE and cP have more datapoints
>(cP was assessed on each day)
>I couldn't fit more parameters than number of equations (excluded
>parameters for the initial values, which weren't assessed, so I try to
>get them as a result  of parameterisation). The most sensitive
>parameters were labelled as k1 and k2, the values for other were
>derived from the literature and embedded in the system of equations.
>I've attached my code. Thanks in advance for any hint why this code
>doesn't work or information were I can find examples for optimisation
>of the similar system of the equations.
>Kind Regards,Malgorzata
>R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>PLEASE do read the posting guide
>and provide commented, minimal, self-contained, reproducible code.

More information about the R-help mailing list