# angle

0th

Percentile

##### Standardised last principal angle

Standardised last principal angle between the subspaces generated by the columns of A and B.

Keywords
algebra
##### Usage
angle(A, B)
##### Arguments
A

Numeric matrix of size $p$ by $k$.

B

Numeric matrix of size $q$ by $l$.

##### Details

We compute the last principal angle between the subspaces generated by the columns of A and B using the algorithm in Bjorck and Golub (1973). This angle takes values between 0 and $\pi/2$. We divide it by $\pi/2$ to make it take values between 0 and 1, where 0 indicates that the subspaces are close.

##### Value

Standardised last principal angle between A and B.

##### References

Bjorck, A. and Golub, G. H. (1973), Numerical Methods for Computing Angles Between Linear Subspaces," Mathematics of Computation, 27, 579--594.

• angle
##### Examples
# NOT RUN {
tmp <- dataGen(m=1)

P <- eigen(tmp$R)$vectors[,1:2]
PP <- rospca(tmp$data[[1]], k=2)$loadings

angle(P, PP)
# }

Documentation reproduced from package rospca, version 1.0.4, License: GPL (>= 2)

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