Nongluck Klibbua <[EMAIL PROTECTED]> writes: > Hi R-users, > I try to use "solve" to find the answer of this linear equation > a=x*b where a is 2*1 matrix and b is 2*2 matrix.I would like to get x so > I call y<-solve(a,b) but this one happen "a is 2*1 matrix" so what I should > do . > Thanks > Luck >
First get your extents right. For the matrix product x*b to make sense, you need x to be n*2 if b is 2*2, and the result is n*2, so how can a be 2*1?? Next, notice that solve(A,b) solves A*x = b, where A is a square matrix, so you need solve(b,a) or maybe solve(b, t(a)) or t(solve(b,t(a)) depending on what your problem really was. -- O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
