[R-sig-dyn-mod] Qn about FME package

[Karline Soetaert]

Vishal, your code was not attached, so I can't have a look. 
However, this usually means that your sesnFun function does not return useful information, i.e. variables whose values are changed when parameters are altered.

There are several vignettes in the FME package that may help you. Try: 
vignette("FMEsteady")
vignette("FMEdyna")
vignette("FMEother")
vignette("FMEmcmc")

The first uses a 1-D steady-state model.

Hope it helps,

Karline

-----Original Message-----
From: R-sig-dynamic-models [mailto:r-sig-dynamic-models-bounces at r-project.org] On Behalf Of Vishal Mehta
Sent: maandag 18 juli 2016 23:28
To: r-sig-dynamic-models at r-project.org
Subject: [R-sig-dyn-mod] Qn about FME package

Dear list,

I've been trying to use FME for sensitivity analysis, parameter estimation and uncertainty analysis, using a simple 1d groundwater model in R (for a groundwater study in India).

I've been trying to follow along the JSS article ("Inverse modeling, sensitivity and monte carlo analysis in R using package FME"), using my model: but I have gotten stuck at the sensFun step: I am not able to get a sensitivity analysis (it comes out all zeros). I am guessing parameter values are not getting perturbed.

Does it work only for differential equations?

I am attaching the R code..if at all you can help, I would really appreciate it! Note, one of the codes is to calculate parameter sensitivity, the other was to try and calibrate (model fit)

Regards,


Vishal K. Mehta<http://sei-us.org/about/staff_person/19>, Ph.D.
Senior Scientist,
Stockholm Environment Institute-US
400 F St, Davis, CA 95616
+ 1 530 753 3035   x3
http://sei-us.org/



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