Bert Gunter Genentech Nonclinical Biostatistics (650) 467-7374 "Data is not information. Information is not knowledge. And knowledge is certainly not wisdom." Clifford Stoll
On Fri, Aug 22, 2014 at 7:16 AM, James Wei <zwei0...@hotmail.com> wrote: > Hi Jorge, > > Thanks so much, it is working perfectly. There are so many for me to learn. Have you done an R tutorial? e.g. http://cran.r-project.org/doc/manuals/R-intro.pdf (This ships with R. There are many others around the web. Just search). If not, please do not post further until you have done so. You cannot complain of ignorance when you have not made an honest effort to learn. And if you have already, post away. Cheers, Bert > > Cheers. > > James > > From: jorgeivanve...@gmail.com > Date: Fri, 22 Aug 2014 22:28:40 +1000 > Subject: Re: [R] print vectors with consecutive numbers > To: zwei0...@hotmail.com > CC: r-help@r-project.org > > Hi James, > > > Try > mat[, apply(mat, 2, function(x) any(diff(x) == 1))] > > > > HTH, > > Jorge.- > > > On Fri, Aug 22, 2014 at 10:18 PM, James Wei <zwei0...@hotmail.com> wrote: > > > > > > > Hi all, > > > > I have a matrix with consecutive and non-consecutive numbers > > in columns. For example, the first 2 columns have consecutive numbers. I want > R > > to print only columns with consecutive numbers. Here is the matrix and how I > > did using conditional statement: > > > > ## > > > > mat=matrix(data=c(9,2,3,4,5,6,10,13,15,17,19,22, > > 25,27,29,31,34,37,39,41),ncol=5) > > > > mat > > > > difference = diff(mat)==1 > > > > difference > > > > y1=difference[1,] > > > > y2=difference[2,] > > > > y3=difference[3,] > > > > y=(y1|y2|y3) > > > > y > > > > > > > > if (y=="TRUE") mat else 0 > > > > ## > > > > However, R still print all 5 columns, not the first 2 > > columns I wanted. I got the Warning message: > > > > In if (y == "TRUE") mat else 0 : > > > > the condition has > > length > 1 and only the first element will be used > > > > How can I change the code to get only the first 2 columns > > with consecutive numbers printed? I am new to R. > > > > Thanks in advance for your help. James > > > > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > 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. > > > > [[alternative HTML version deleted]] > > ______________________________________________ > 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. ______________________________________________ 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.
