[R] Matrix:::qr.qy and signature(qr = "sparseQR", y = "dgCMatrix")

2011-08-23 Thread Felix Lamp
x:::qr.qy and signature(qr = "sparseQR", y = "dgCMatrix"). What low level functions do I have to call? I would also be grateful for any suggestions for finding diagonal values of the hat matrix in regression problems with large and sparse design matrices. Best, Felix Lamp

[R] fGarch and is.na()

2008-12-02 Thread Felix Lamp
Hello, after loading package "fGarch" the function is.na.data.frame() is behaving different: > sessionInfo() R version 2.8.0 (2008-10-20) i386-pc-mingw32 locale: LC_COLLATE=English_United States.1252;LC_CTYPE=English_United States.1252;LC_MONETARY=English_United States.1252;LC_NUMERIC=C;LC_

[R] Weights argument in loess (stats)

2007-11-14 Thread Felix Lamp
Hello, I have a question concerning the weights argument of the loess function in the stats package. Do the weights correspond to multiplying the local regression equation by the weights or by the square root of the weights (like in lm). In "http://www.netlib.org/a/cloess.pdf"; page 7 it appears