search for: eigenv

I'm using R 1.7.1 under linux redhat it seems that the eigen values produced by eigen() do not follow a consistant order; I mean either ascending or discending e.g for one system: eigenV<-eigen(V) > print(eigenV$values) [1] -7.706828e+13 -4.702980e+13 -3.267579e+13 -1.701297e+13 -8.041677e+12 [6] -5.707311e+12 -5.053941e+12 -4.774652e+12 -4.280423e+12 -3.798905e+12 [11] -3.422172e+12 -3.148595e+12 -2.974540e+12 -2.881025e+12 -2.730044e+12 [16] -2.476652e+1...

Hi everyone, I want to convert an R function into VBA for calculating the eigenvectors and eigenvalues of a matrix using the "Power Method". The function is: PowerMethod <- function(x, tolerance) {     my.mat <- var(x[,-1], na.method="available")     matSize <- dim(my.mat)[1]     eigenVec <- matrix(NA, nrow=matSize, ncol=matSize)     eigenVal &...

...c 1, 1998" [1] " Visit his web site at http://www.informatik.uni-frankfurt.de/~stst/benchspl.txt" [1] " He has same bench for Gauss, Mathlab, Splus, Ox, etc... " [1] "" [1] "" [1] "400 x 400 random matrix^1000 (sec.) : " [1] 0.1899414 [1] "Eigenval. of a 300 x 300 randommatrix (sec.) :" [1] 58.55005 [1] "Inverse of a 500 x 500 random matrix (sec.) :" [1] 50.16992 [1] "500000 values sorted ascending (sec.) :" [1] 2.800049 [1] "800 x 800 Toeplitzmatrix (sec.) :" [1] 3.430176 [1] "Cholesky decomposit...

I tried make a pca analysis with R. For this propose i need centered rows and columns. I make this using the function princomp: > zz<-princomp(x,cor=TRUE) When i do it each column have mean=0 and standard deviation=1. But i have this problem: the total inertia, sum of Eigenval., dont is = =number of columns * 1= sum of total standard deviation Why? It's a bug in R? I have make online this analyse in http://pbil.univ-lyon1.fr/ADE-4/ADE-4F.html and everything it's OK. Thanks in advance -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-...

I am new in R and I want to solve this problem; I have a matrix X (with n-rows and p-colums) my problem is to obtain the products of the vectors of rows and print out only the maximum value and identify the row that gives the maximum value. Thanks Oyeyemi, G.M --------------------------------- Don't pick lemons. [[alternative HTML version deleted]]