Nothing
.givensrot <- function(t, dim=2, i=1, j=2) {
rot = matrix(rep(0, dim^2), nrow=dim)
rot[i,i] = cos(t)
rot[j,j] = cos(t)
rot[i,j] = sin(t)
rot[j,i] = -sin(t)
return(rot)
}
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