Thanks for the answer. The problem is I have to perform a forward selection on the set and in every step construct an orthonormal base for the subspace spanned on the selected vectors. This means that I can use only the "full" vectors for the constructing a base, or?
Joanna --- Petr Pikal <[EMAIL PROTECTED]> schrieb: > Hi > > see > ?complete.cases and/or ?is.na for evaluating non missing entries. > > However in any operation in which you use NA value, result shall be > NA as you do not know what actually is NA. > > HTH > Petr > > > Hi all, > > > > I have a large set of descriptors, which are stored as the vectors, > > each one containing about 450 elements. Now I have to perform some > > algebraical operations on this set to eliminate the redundant ones. > > The problem is, that not all vales in the vectors are known. Are there > > any norm defined how should I process such vectors? Simple example: > > having two vectors: > > > > a b > > 3 4 > > 2 null > > 3 6 > > > > I can imagine that a+b is [7 null 9]', but what about scalar product? > > Is it null or have it a value? I don't want to replace missing values > > with the concrete ones, but they significantly complicate my > > computations. > > > > Does anyone know whether there are any ways to solve this problem? > > Please share some experience. Really appreciate the help! > > > > Sincerely, > > > > Joanna > > > > ______________________________________________ > > R-help@stat.math.ethz.ch 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. > > Petr Pikal > [EMAIL PROTECTED] > > ______________________________________________ R-help@stat.math.ethz.ch 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.