Hi Tan Dai, It looks like you have little or no variance in your measurements, and so the result is degenerate. The functions you are using are probably working properly, but there is nothing to display.
Jim On Sat, Dec 10, 2016 at 6:04 PM, Tan Dai Chuan via R-help <r-help@r-project.org> wrote: > Hi, i face the problem as i attached in below. although i enlarge it, i still > a straight and any solutions to solve it? Hope can get repsonse this few > days. It is urgent. > > Thank you so much. > Regards,Tan Dai Chuan > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.