[R] "matrix is not of full rank" error in package tgp

[Rainer M Krug]

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Hi

I want to use the package tgp with its sens() function to cunduct a
sensitivity analysis of an ecological simulation model and six
independent input parameter.
I conducted 10.000 simulations based on a Latin Hypercube design to
sample the whole parameter range. Now I want to use the sens function to
conduct the sensitivity analysis.

I use the following call:

  SA <- sens(X = X, Z = Z, nn.lhs = 600, model = bgpllm, verb = 2)

where X are my 6 input parameter, and Z is the response variable.

My problem is, that I get a

X[,1:6]-matrix is not of full rank

error. I must admit ignorance, as I neither know what a "matrix of full
rank" is, and how I can fix this so that I can conduct a sensitivity
analysis by using sens().

Any help is appreciated,

Thanks,

Rainer

- -- 
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
Biology, UCT), Dipl. Phys. (Germany)

Centre of Excellence for Invasion Biology
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