Hi try to post some reproducible example and maybe somebody can help you more. You need to handle missing values one way or another. Either you can supply a value for it or you can get rid of them. If you used it in computation, the result will be NA. At least I think so.
HTH Petr On 31 Jul 2006 at 14:37, Joanna Procelewska wrote: Date sent: Mon, 31 Jul 2006 14:37:33 +0200 (CEST) From: Joanna Procelewska <[EMAIL PROTECTED]> To: r-help@stat.math.ethz.ch Subject: Re: [R] Algebraic operation on the missing values > 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. 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.
