[R] optimisation of the system of differential equations

Jim Lemon drjimlemon at gmail.com
Mon Feb 20 21:49:26 CET 2017

Hi Malgorzata,
There is currently another thread on the list about attaching R code
to emails. The problem appears to be that if you attach a file with
the extension ".R" it is sent in a way that is blocked by the mail
server. If you want to attach an R code file to your message, change
the extension to ".txt". You can also just copy it into your message,
although if it is very long it may be hard to read.


On Tue, Feb 21, 2017 at 2:26 AM, 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
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