R Under development (unstable) (2015-09-06 r69303) -- "Unsuffered Consequences"
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> ## array subsetting tests
> ##
> ## Tests should be written to raise an error on test failure
> ##
> 
> ## Test for subsetting of an array using a matrix with ncol == length(dim(x))
> 
> ## first matrix case
> m <- matrix(1:25, ncol=5, dimnames = list(letters[1:5], LETTERS[1:5]))
> 
> si <- matrix(c(1, 1, 2, 3, 3, 4), ncol = 2, byrow = TRUE)
> ss <- matrix(c("a", "A", "b", "C", "c", "D"), ncol = 2, byrow = TRUE)
> 
> stopifnot(identical(m[si], m[ss]))
> stopifnot(identical(c(1L, 12L, 18L), m[ss]))
> 
> ## test behavior of NA entries in subset matrix.
> ## NA in character matrix should propagate and should not
> ## match an NA in a dimname.
> 
> ## An NA in either column propagates to result
> ssna <- ss; ssna[2, 2] <- NA
> stopifnot(identical(c(1L, NA, 18L), m[ssna]))
> ssna <- ss; ssna[2, 1] <- NA
> stopifnot(identical(c(1L, NA, 18L), m[ssna]))
> 
> ## An NA in row/column names is not matched
> mnadim <- m
> tmp <- rownames(mnadim)
> tmp[5] <- NA
> rownames(mnadim) <- tmp
> stopifnot(identical(c(1L, NA, 18L), m[ssna]))
> 
> ## Unmatched subscripts raise an error
> ssnm <- ss
> ssnm[2, 2] <- "NOMATCH"
> stopifnot(inherits(try(m[ssnm], silent=TRUE), "try-error"))
> 
> ## "" does not match and so raises an error
> mnadim <- m
> tmp <- rownames(mnadim)
> tmp[5] <- ""
> rownames(mnadim) <- tmp
> ssnm <- ss
> ssnm[2, 2] <- ""
> stopifnot(inherits(try(mnadim[ssnm], silent=TRUE), "try-error"))
> 
> 
> ## test assignment
> m3 <- m2 <- m
> m2[si] <- c(100L, 200L, 300L)
> m3[ss] <- c(100L, 200L, 300L)
> stopifnot(identical(m2, m3))
> 
> ## now an array case
> a <- array(1:75, dim = c(5, 5, 3),
+            dimnames = list(letters[1:5], LETTERS[1:5], letters[24:26]))
> 
> si <- matrix(c(1, 1, 1,
+                2, 3, 1,
+                3, 4, 1,
+                5, 1, 3),
+              ncol = 3, byrow = TRUE)
> 
> ss <- matrix(c("a", "A", "x",
+                "b", "C", "x",
+                "c", "D", "x",
+                "e", "A", "z"),
+              ncol = 3, byrow = TRUE)
> 
> stopifnot(identical(a[si], a[ss]))
> stopifnot(identical(c(1L, 12L, 18L, 55L), a[ss]))
> 
> a2 <- a1 <- a
> a1[si] <- c(100L, 1200L, 1800L, 5500L)
> a2[ss] <- c(100L, 1200L, 1800L, 5500L)
> stopifnot(identical(a1, a2))
> 
> ## it is an error to subset if some dimnames are missing NOTE: this
> ## gives a subscript out of bounds error, might want something more
> ## informative?
> a3 <- a
> dn <- dimnames(a3)
> dn[2] <- list(NULL)
> dimnames(a3) <- dn
> stopifnot(inherits(try(a3[ss], silent=TRUE), "try-error"))
>