Nothing
library(QZ, quiet = TRUE)
### Get eigenvalues
A <- exA2$A
ret0 <- qz.dgeev(A)
ret1 <- qz.dgees(A)
# Reordering eigenvalues
T <- ret1$T
Q <- ret1$Q
select <- c(TRUE, FALSE, FALSE, TRUE)
ret2 <- qz.dtrsen(T, Q, select)
# Verify 0
round(ret0$WR - ret1$WR)
round(ret0$WI - ret1$WI)
# Verify 1
A.new <- ret2$Q %*% ret2$T %*% solve(ret2$Q)
round(A - A.new)
# verify 2
round(ret2$Q %*% solve(ret2$Q))
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