normalize | R Documentation |
Normalize a vector or matrix to zero mean and unit length columns.
normalize(X)
X |
a matrix with the training data with observations down the rows and variables in the columns. |
This function can e.g. be used for the training data in the ASDA
function.
normalize
Returns a list with the following attributes:
The normalized data
Mean of columns of X
.
Length of columns of X
.
Logical vector indicating which variables are included in X. If some of the columns have zero length they are omitted
Line Clemmensen
Clemmensen, L., Hastie, T. and Ersboell, K. (2008) "Sparse discriminant analysis", Technical report, IMM, Technical University of Denmark
normalizetest
, predict.ASDA
, ASDA
## Data X<-matrix(sample(seq(3),12,replace=TRUE),nrow=3) ## Normalize data Nm<-normalize(X) print(Nm$Xc) ## See if any variables have been removed which(!Nm$Id)
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