I have a 3D ordination with two groups, and want to identify the points in one group that lie within the 3D convex hull of the other. I would appreciate any enlightenment about why the command at the end (below in a toy example) crashes R when I try to ID the points in the hull using pip3d(), from package ptinpoly. convhulln() is from package geometry. Have I not supplied the right “Faces” argument to pip3d()?
The objects are not large and are reproduced at the bottom of this message. Thanks ------------------------ > sessionInfo() R version 3.0.3 (2014-03-06) Platform: x86_64-apple-darwin10.8.0 (64-bit) locale: [1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8 attached base packages: [1] stats graphics grDevices utils datasets methods base other attached packages: [1] ptinpoly_2.0 misc3d_0.8-4 geometry_0.3-4 magic_1.5-6 abind_1.4-0 loaded via a namespace (and not attached): [1] tools_3.0.3 —— > set1 <- matrix(rnorm(99),ncol=3) > ch1 <- convhulln(set1) Output completed. Verifying that all points are below outer planes of all facets. Will make 594 distance computations. > set2 <- matrix(rnorm(33)/2,ncol=3) > temp.out <- pip3d(set1,ch1,set2) R CRASHES HERE ---------------------------------- Don McKenzie Research Ecologist Pacific Wildland Fire Sciences Lab US Forest Service Affiliate Professor School of Environmental and Forest Sciences University of Washington [email protected] ———————————————— set1 [,1] [,2] [,3] [1,] -0.36381788 0.96624676 -1.09251167 [2,] -1.09242946 -0.82002293 0.42005666 [3,] 0.93852498 1.18059117 -0.34816811 [4,] -0.77413132 1.06018374 -0.37589340 [5,] -1.67759103 -1.52469985 0.85310979 [6,] 0.81729494 -0.18900503 0.83172169 [7,] 0.30546957 0.97549183 -1.30815121 [8,] 0.22201517 -0.38260850 -0.05412764 [9,] 0.48817331 1.30314678 0.19143994 [10,] 1.89836307 -0.34575059 0.55599170 [11,] 0.20776401 0.04977816 -0.78034565 [12,] -0.76819740 0.24554574 0.40398017 [13,] 0.38369531 1.07688341 -0.22686023 [14,] 0.31806928 1.15482656 -0.99259846 [15,] 1.07142182 -1.03495199 -0.15650968 [16,] -1.24667302 -0.35217160 0.71090188 [17,] -0.92079326 -1.44075490 -0.42838857 [18,] 0.16907840 0.37587569 1.34994069 [19,] 0.50947015 1.81852997 -1.83315646 [20,] 0.52015187 1.56904146 0.90679914 [21,] -0.04261864 -1.22145642 0.51953397 [22,] -0.86611946 -1.21106313 -0.86571463 [23,] -0.13147715 0.07893287 0.83513033 [24,] -0.63488792 -0.89396994 0.70103420 [25,] -0.11370015 2.00351619 -0.17652412 [26,] -1.04527261 -0.14570830 1.64893662 [27,] 0.46238598 -0.07990767 0.16431874 [28,] -0.72396505 1.45081393 -0.91068823 [29,] -0.48892499 -1.05289633 1.36531224 [30,] 1.83781721 1.50964339 1.85100986 [31,] 1.00023790 -0.92779325 -2.16783507 [32,] -0.51429532 -1.44766548 -1.41456589 [33,] -0.93249545 -0.21845332 0.75023990 > ch1 [,1] [,2] [,3] [1,] 15 31 10 [2,] 29 30 10 [3,] 29 15 10 [4,] 26 28 25 [5,] 26 29 5 [6,] 26 29 30 [7,] 32 15 31 [8,] 19 28 25 [9,] 19 32 31 [10,] 19 32 28 [11,] 19 30 25 [12,] 19 31 10 [13,] 19 30 10 [14,] 21 29 5 [15,] 21 29 15 [16,] 21 32 5 [17,] 21 32 15 [18,] 20 30 25 [19,] 20 26 25 [20,] 20 26 30 [21,] 16 28 5 [22,] 16 26 5 [23,] 16 26 28 [24,] 22 28 5 [25,] 22 32 5 [26,] 22 32 28 > set2 [,1] [,2] [,3] [1,] 0.061298933 0.561676607 -0.29029312 [2,] -0.227292687 0.980185118 0.21751216 [3,] 0.182482967 0.913803801 -0.08308208 [4,] -0.143596376 -0.007469921 -0.33050543 [5,] -0.354096826 0.023132113 0.45463150 [6,] 0.006247011 0.183155253 0.97496500 [7,] 0.128600720 -0.249603537 -0.24710206 [8,] -0.418782299 -0.325201099 0.28908138 [9,] 0.231829464 0.343250895 0.65134735 [10,] -0.392597726 0.126741875 0.21411363 [11,] -0.051290704 -1.007826669 0.92808143 _______________________________________________ R-SIG-Mac mailing list [email protected] https://stat.ethz.ch/mailman/listinfo/r-sig-mac
