Hi, I'm trying to use kcca function from the kernlab package, and it requires 2 input datasets, both of which need to be matrices containing data index by row. I have two data frame objects which I converted to matrices using data.frame(x). Their dimensions are 2264*10 and 2264*4. I then tried running kcca on the two data matrices, only to get this error: Error in kcca(xm, ym) : Number of colums in x, y matrixes is not equall Does anyone know why I'm encountering this error? Also, just to make the number of columns equal, I transposed my two data matrices, and reran kcca, on which I got a different error message: Error in VK[(n + 1):(2 * n), ] <- Ky : number of items to replace is not a multiple of replacement length I'm not sure how to proceed further. Any help would be greatly appreciated. Thanks, Guru. -- View this message in context: http://www.nabble.com/Input-format-for-kcca-in-kernlab-tp25683222p25683222.html Sent from the R help mailing list archive at Nabble.com.