griddata : error in use due to facet being coplanar
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I was wondering if anyone can decipher an error message I get when I send 3 tables into griddata. The x, y, and z tables are 61x63 and I am trying to get values at vectors x_vctr, y_vctr via : gi=griddata(x,y,z,x_vctr,y_vctr,'linear'); I have a doc file with the complete message but it begins :
??? qhull precision error: initial facet 2 is coplanar with the interior point
ERRONEOUS FACE
While executing: | qhull d Qt Qbb Q
Options selected for Qhull 2003.1 2003/12/30:
delaunay Qtriangulate Qbbound-last Qcoplanar-keep _pre-merge
_zero-centrum Pgood Qinterior-keep _max-width 3.7e+003
Error-roundoff 6.1e-012 _one-merge 4.3e-011 Visible-distance 1.2e-011
U-coplanar-distance 1.2e-011 Width-outside 2.4e-011 _wide-facet 7.3e-011
precision problems (corrected unless 'Q0' or an error)
2
flipped facets
The input to qhull appears to be less than 3 dimensional, or a
computation has overflowed.
Qhull could not construct a clearly convex simplex from points:
The center point is coplanar with a facet, or a vertex is coplanar
with a neighboring facet. The maximum round off error for
computing distances is 6.1e-012. The center point, facets and distances
to the center point are:
Thanks
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