Hi All, convhulln {geometry} computes the convex hull of a set of points in n- dimensions via .call, returning the hull itself, and also "unavoidably generates a diagnostic report on an Rterm console." See the example below. I need to access the results of the diagnostic report (specifically the computed hull volume) from within R, but I cannot see how. I've looked at .call, but it is not clear to me how to get the text of the "diagnostic report". Any help would be greatly appreciated! Thanks! Dan #example code #set of points (points=data.frame(x=rnorm(10),y= rnorm(10),z= rnorm(10))) #compute hull (hull1 = t(convhulln(points, options="QJ"))) #optional - plot hull with rgl rgl.triangles(points[hull1,1], points[hull1,2], points [hull1,3],col="blue",alpha=.2) example output > #set of points > (points=data.frame(x=rnorm(10),y= rnorm(10),z= rnorm(10))) x y z 1 -1.5625226 -0.6636375 -0.01373521 2 -0.2945998 -0.5152384 1.23246042 3 1.4209087 0.2085240 0.36009705 4 -0.2731960 -0.4556075 0.91815690 5 0.6231554 0.7472131 0.47208558 6 -0.6723569 -1.4897516 1.32757617 7 -1.3571404 0.2714682 -0.31701321 8 -0.7433676 -0.1174382 -1.12368941 9 0.3555069 1.3319899 1.65317140 10 -0.9877572 -0.2611568 -0.61043137 > #compute hull > (hull1 = t(convhulln(points, options="QJ"))) [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [1,] 6 6 8 8 7 7 5 5 5 5 [2,] 9 9 6 6 9 8 9 8 7 7 [3,] 1 3 1 3 1 1 3 3 9 8 qhull warning: joggle ('QJ') always produces simplicial output. Triangulated output ('Qt') does nothing. Convex hull of 10 points in 3-d: Number of vertices: 7 Number of facets: 10 Statistics for: | qhull s Qt Tcv QJ Number of points processed: 7 Number of hyperplanes created: 16 Number of distance tests for qhull: 39 CPU seconds to compute hull (after input): 0 Input joggled by: 6.9e-11 Output completed. Verifying that all points are below 6.9e-15 of all facets. Will make 100 distance computations. > -- Daniel E. Bunker TraitNet Associate Director BioMERGE Associate Director Post-Doctoral Research Scientist Columbia University Department of Ecology, Evolution and Environmental Biology 1200 Amsterdam Avenue New York, NY 10027-5557 deb37ATcolumbiaDOTedu 917-843-5076 phone 212-854-8188 fax [[alternative HTML version deleted]]