Nothing

```
context("manhattan")
test_that("manhattan metric works as expected", {
x <- matrix(rnorm(200), nrow = 100)
dist_dist <- dist(x, method = "manhattan")
dist_mat <- as.matrix(dist_dist)
attr(dist_mat, "dimnames") <- NULL
# check pdist and cdist
expect_equivalent(dist_dist, rdist(x, metric = "manhattan"))
expect_equivalent(dist_mat, pdist(x, metric = "manhattan"))
expect_equivalent(dist_mat, cdist(x, x, metric = "manhattan"))
expect_equivalent(dist_mat[1:2, 3:100],
cdist(x[1:2, ], x[3:100, ], metric = "manhattan"))
expect_equivalent(dist_mat[1, 2:100, drop = FALSE],
cdist(x[1, , drop = FALSE], x[2:100, , drop = FALSE], metric = "manhattan"))
})
```

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