centerDataTwoGroupsByIndices {jointMeanCov}

Center Each Column by Subtracting Group Means

Description

This function takes a data matrix and returns a centered data matrix. For each column, centering is performed by subtracting the corresponding group mean from each entry (i.e. for entries in group one, the group one mean is subtracted, and for entries in group two, the group two mean is subtracted).

Usage

centerDataTwoGroupsByIndices(X, group.one.indices, group.two.indices)

Arguments

X

a data matrix.

group.one.indices

indices of observations in group one.

group.two.indices

indices of observations in group two.

Details

Example

X <- matrix(1:12, nrow=4, ncol=3)
X.cen <- centerDataTwoGroupsByIndices(
  X, group.one.indices=1:2, group.two.indices=3:4)

Value

Returns a centered data matrix of the same dimensions as the original data matrix.