[R] Fitting Zernike polynomials

I was looking for some routines to fit Zernike polynomials but nothing came up in the archive search. Can anyone provide a lead? --Rich Richard Kittler AMD TDG 408-749-4099 __ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r

RE: [R] Coercing a dataframe column to datetime

I understand I can do it directly with only one column. It was meant to be a simple case to illustrate my problem. I need to do it over many columns in the real application. --Rich Richard Kittler AMD TDG 408-749-4099 -Original Message- From: Petr Pikal [mailto:[EMAIL PROTECTED

RE: [R] Coercing a dataframe column to datetime

Sorry to bother you all with this one. I determined that the problem is solved if I use 'lapply' rather than 'sapply'. Since sapply returns the result as a vector it must be making a best guess of numeric for the class of the result (?) --Rich Richard Kittler AMD TDG 408-749-4099

RE: [R] Coercing a dataframe column to datetime

)); ds [,1] [,2] [1,] 1 02/27/92 23:03:20 [2,] 2 02/27/92 22:29:56 q - sapply(ds[,2], function(x) as.POSIXct(strptime(x,%m/%d/%y %H:%M:%S))) class(q) [1] numeric q 02/27/92 23:03:20 02/27/92 22:29:56 699260600 699258596 --Rich Richard Kittler AMD TDG

[R] Coercing a dataframe column to datetime

of replacement length length(q) [1] 9 . --Rich Richard Kittler AMD TDG 408-749-4099 __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do

[R] Lattice::qqmath -- groups option question

Does the 'groups' option on qqmath just color the points differently in the main distribution or does it actually overlay separate quantile plots for each subset? I would like to be able to do the latter. --Rich Richard Kittler AMD TDG 408-749-4099

RE: [R] Lattice::qqmath -- groups option question

Thanks for the info. Given that I rule out qqmath would the best method be to make repeated calls to qqnorm without plotting and then overlay the results or is there a more elegant method? --Rich Richard Kittler AMD TDG 408-749-4099 -Original Message- From: Deepayan Sarkar [mailto

RE: [R] Is there an R-version of rayplot

Plot',type='n') arrows(x,y,x1,y1,length=0.1) --Rich Richard Kittler AMD TDG 408-749-4099 -Original Message- From: joerg van den hoff [mailto:[EMAIL PROTECTED] Sent: Wednesday, June 09, 2004 4:10 AM Cc: Kittler, Richard; [EMAIL PROTECTED] Subject: Re: [R] Is there an R-version of rayplot

[R] Is there an R-version of rayplot

I need to make plots similar to those produced by the s-plus rayplot function but can't seem to find it in R. These 'vector maps' plot a ray or vector at each specified location. Is there something similar in R ? --Rich Richard Kittler AMD TDG 408-749-4099

[R] Lattice xyplot - problem trying to produce multiple output files with a 'for' loop

) ds1 - subset(ds, TR == byvar, select=c(CTY, HWY, CO)) xyplot( ds1$CTY ~ ds1$HWY, groups=ds1$CO, auto.key=list(space=right), ylab=CTY, xlab=HWY) dev.off() } . --Rich Richard Kittler AMD TDG 408-749-4099