```
# NOT RUN {
x <- matrix(c(1, 0, 0, 2), nrow = 2)
s <- as.simple_triplet_matrix(x)
identical(x, as.matrix(s))
simple_triplet_matrix(c(1, 4), c(1, 2), c(1, 2))
simple_triplet_zero_matrix(3)
simple_triplet_diag_matrix(1:3)
cbind(rbind(s, t(s)), rbind(s, s))
# }
# NOT RUN {
## map to default Matrix class
stopifnot(require("Matrix"))
sparseMatrix(i = s$i, j = s$j, x = s$v, dims = dim(s),
dimnames = dimnames(s))
# }
```

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