R Under development (unstable) (2026-01-25 r89330 ucrt) -- "Unsuffered Consequences"
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> # Tests for sparse SVD/PCA
> require("irlba")
Loading required package: irlba
Loading required package: Matrix
> loc <- ""
> 
> test <- function()
+ {
+   on.exit(message("Error occured in: ", loc))
+   loc <<- "sparse SVD"
+   set.seed(1)
+   x <- matrix(rnorm(100), 10)
+   s <- ssvd(x, 1, n=5)
+   stopifnot(isTRUE(all.equal(sqrt(drop(crossprod(x %*% s$v - s$u %*% s$d))), 0)))
+ 
+   loc <<- "sparse PCA"
+   set.seed(1)
+   x <- matrix(rnorm(100), 10)
+   s <- ssvd(x, 1, n=5, center=TRUE)
+   stopifnot(isTRUE(all.equal(sqrt(drop(crossprod(scale(x, center=TRUE, scale=FALSE) %*% s$v - s$u %*% s$d))), 0)))
+ 
+   loc <<- "sparse PCA + scale"
+   set.seed(1)
+   x <- matrix(rnorm(100), 10)
+   s <- ssvd(x, 1, n=5, center=TRUE, scale.=TRUE)
+   isTRUE(all.equal(sqrt(drop(crossprod(scale(x, center=TRUE, scale=TRUE) %*% s$v - s$u %*% s$d))), 0))
+ 
+   loc <<- "sparse scaled"
+   set.seed(1)
+   x <- matrix(rnorm(100), 10)
+   s <- ssvd(x, 1, n=5, center=FALSE, scale.=TRUE)
+   isTRUE(all.equal(sqrt(drop(crossprod(scale(x, center=FALSE, scale=TRUE) %*% s$v - s$u %*% s$d))), 0))
+ 
+   on.exit()
+ }
> test()
> 
> proc.time()
   user  system elapsed 
   1.35    0.18    1.51