Re: [R] Error in calcCurveGrob(x, x$debug) : End points must not be identical

[Paul Murrell]

Hi

Bryan Hanson wrote:
Hi All... I haven¹t found mention of this error anywhere.  I'm trying to
draw spline curves using grid graphics.  Most of the time, I have no
problems, but I have some data sets that give the error in the subject line.
I'm not sure which end points are identical, but the end points passed to
the function are definitely not identical.

I get ...

 which(tst$x.st == tst$x.end & tst$y.st == tst$y.end)
[1] 11 14

Also, the viewport you have set up will not show any of the curves 
because its "native" scale is 0 to 1.  The following at least makes the 
curves visible ...

grid.newpage()
vp <- viewport(width = 0.9, height = 0.9, x = 0.5, y = 0.5,
               xscale=c(-10, 10), yscale=c(-15, 15))
pushViewport(vp)
grid.rect(gp = gpar(lty = "dashed", col = "gray"))
grid.points(0.5, 0.5, pch = 20, gp = gpar(cex = 0.5))
subset <- -c(11, 14)
grid.curve(tst$x.st[subset], tst$y.st[subset],
           tst$x.end[subset], tst$y.end[subset],
           default.units = "native")

Paul

p.s.  Intrigued to know what sort of image you are producing, if you are 
able to share.


Any assistance appreciated!  Bryan

tst <-
structure(list(x.st = c(-1, -2, -3, -1, -1.5, -3, -1.5, -1.5,
-8, -1, -1.5, -1, -1.5, -2, -1.5, -2, -1, -1.5, -2), y.st =
c(1.73205080756888,
3.46410161513776, 5.19615242270663, 1.73205080756888, 2.59807621135332,
5.19615242270663, 2.59807621135332, 2.59807621135332, 13.8564064605510,
1.73205080756888, 2.59807621135332, 1.73205080756888, 2.59807621135332,
3.46410161513776, 2.59807621135332, 3.46410161513776, 1.73205080756888,
2.59807621135332, 3.46410161513776), x.end = c(-6.5, -6.5, -6.5,
-4, -4, -4, -1.5, -1, -1, -1.5, -1.5, -2, -2, -2, -3, -3, -8,
-8, -8), y.end = c(-11.2583302491977, -11.2583302491977, -11.2583302491977,
-6.92820323027551, -6.92820323027551, -6.92820323027551, -2.59807621135332,
1.73205080756888, 1.73205080756888, 2.59807621135332, 2.59807621135332,
3.46410161513776, 3.46410161513776, 3.46410161513776, 5.19615242270663,
5.19615242270663, 13.8564064605510, 13.8564064605510, 13.8564064605510
), grp = c(3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3), lwd = c(1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 3, 1, 1, 1,
2, 5, 2)), .Names = c("x.st", "y.st", "x.end", "y.end", "grp",
"lwd"), row.names = 34:52, class = "data.frame")

grid.newpage()
vp <- viewport(width = 0.9, height = 0.9, x = 0.5, y = 0.5)
pushViewport(vp)
grid.rect(gp = gpar(lty = "dashed", col = "gray"))
grid.points(0.5, 0.5, pch = 20, gp = gpar(cex = 0.5))
grid.curve(tst$x.st, tst$y.st, tst$x.end, tst$y.end,
    default.units = "native")

#######
sessionInfo()
R version 2.12.0 (2010-10-15)
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)

locale:
[1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] datasets  tools     grid      grDevices graphics  utils
[7] stats     methods   base

other attached packages:
 [1] gridExtra_0.7      GGally_0.2.2       xtable_1.5-6
 [4] mvbutils_2.5.1     ggplot2_0.8.8      proto_0.3-8
 [7] reshape_0.8.3      ChemoSpec_1.46     seriation_1.0-2
[10] colorspace_1.0-1   TSP_1.0-1          R.utils_1.5.3
[13] R.oo_1.7.4         R.methodsS3_1.2.1  rgl_0.92.794
[16] lattice_0.19-13    mvoutlier_1.4      plyr_1.2.1
[19] RColorBrewer_1.0-2 chemometrics_1.0   som_0.3-5
[22] robustbase_0.5-0-1 rpart_3.1-46       pls_2.1-0
[25] pcaPP_1.8-3        mvtnorm_0.9-92     nnet_7.3-1
[28] mclust_3.4.6       MASS_7.3-8         lars_0.9-7
[31] gclus_1.3          cluster_1.13.1     e1071_1.5-24
[34] class_7.3-2   

______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

--
Dr Paul Murrell
Department of Statistics
The University of Auckland
Private Bag 92019
Auckland
New Zealand
64 9 3737599 x85392
p...@stat.auckland.ac.nz
http://www.stat.auckland.ac.nz/~paul/

______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.