Hi everyone,
I have a question about FD package. I�m trying to calculate functional
diversity indices on my marine organisms data. My trait data includes mobility,
feeding type and reworking sediment type. I allowed more than one functional
trait for a given taxon for each category, and scored from 0 to 1 based on the
extent to which they displayed each trait. If two traits were shared by one
taxa, I gave it 0.5 and 0.5 per trait.
ex1<-dbFD(fi,abund,calc.FRic = F/T, corr="cailliez",
w.abun = T, CWM.type = "all" )
However, when I set �calc.Frich=T�, I got the Feve, Fdis, RaoQ and CWM values
for my data, BUT when I set �calc.Frich=T� I receive the following error:
Error in convhulln(tr.FRic, "FA") :
Received error code 2 from qhull. Qhull error:
qhull precision warning:
The initial hull is narrow (cosine of min. angle is 1.0000000000000000).
Is the input lower dimensional (e.g., on a plane in 3-d)? Qhull may
produce a wide facet. Options 'QbB' (scale to unit box) or 'Qbb' (scale
last coordinate) may remove this warning. Use 'Pp' to skip this warning.
See 'Limitations' in qh-impre.htm.
QH6114 qhull precision error: initial simplex is not convex. Distance=-2.5e-015
While executing: | qhull FA Qt
Options selected for Qhull 2015.2.r 2016/01/18:
run-id 748402268 FArea-total Qtriangulate Qxact_merge _zero-centrum
Q3-no-merge-vertices-dim-high _max-width 5.4 Error-roundoff 2.2e-014
_one-merge 3.7e-013 _near-inside 1.8e-012 Visible-distance 1.3e-013
U-coplanar-distance 1.3e-013 Width-outside 2.6e-013 _wide-facet 7.8e-013
_narrow-hull 0
precision problems (corrected unless 'Q0' or an error)
1 flipped facets
7 nearly singular or axis-parall
Could you please tell me how can I fix this problem and have the FRic value
for my data?
If you can hel me with that, it would be very appreciated.
Regards,
Alessia
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