[R] optimisation of the system of differential equations
jdnewmil at dcn.davis.ca.us
Mon Feb 20 16:48:58 CET 2017
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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.
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