Hi Ting-Wen.

If you could (off-list) send me the simplest possible reproducible example of the error (with your input data files or a saved R workspace) I would be more than happy to look into it.


All the best, Liam

Liam J. Revell, Associate Professor of Biology
University of Massachusetts Boston
web: http://faculty.umb.edu/liam.revell/
email: liam.rev...@umb.edu
blog: http://blog.phytools.org

On 4/27/2017 4:11 AM, Chen, Ting-Wen wrote:
Dear all,

I’m measuring phylogenetic signal for a set of continuous traits using the 
function “phylosig”. I try to apply standard error of measurements in Pagel’s 
lambda, but the R gives this error message:

'Error in solve.default(V) :
  Lapack routine dgesv: system is exactly singular: U[1,1] = 0’

It seems to be a problem when the function tries to invert the matrix? Does 
anybody know how to solve this problem? I have tried to multiply all trait 
values and standard errors by e.g. 100, and for some traits it works but for 
some not…

Any suggestion will be very appreciated. Thank you!

All the best
Ting-Wen

--
Ting-Wen Chen
Animal Ecology (AG Scheu)
J.F. Blumenbach Institute of Zoology and Anthropology
Georg August University Göttingen
Untere Karspüle 2
D-37073 Göttingen, Germany


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