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...lem with over 300 variables. In this case Rdonlp2 is very very slowly. I know that in Matlab exists Knitro (http://www.ziena.com/knitro.htm.) for large optimization problems. It will be great if you can suggest me some alternatives solutions. Thanks in advance, Florin -- Florin G. Maican ================================== Ph.D. candidate, Department of Economics, School of Business, Economics and Law, Gothenburg University, Sweden ----------------------------------- P.O. Box 640 SE-405 30, Gothenburg, Sweden...

...orthogonal complement of one matrix? If A (n x m ) matrix of full column rank (n>m), its orthogonal complement is denoted by A_ . A_ is n X (n-m) matrix of full column rank and such that A'A_=0. I need to compute A_. How I can compute A_ in R? Best Regards, /Florin -- Florin G. Maican Ph.D. candidate, Department of Economics School of Economics and Commercial Law Gothenburg University, Sweden E-mail: Florin.Maican at handels.gu.se P.O.Box 640 SE-405 30 Gothenburg, Sweden Phone no +46 31 773 4866 Fax no +46 31 773 4154

I am a new R-language user. I have set up a data frame "mydata",one of the colume of which is "skill". Now I want to select the observations whose "skill" value is equal to 1,by what command can I get it?