Nothing

```
context('Coordinates')
test_that('Polar coordinates (no shift)', {
# Create some points in cartesian coordinates
xs <- c(0, 0, 1, 2)
ys <- c(0, 1, 1, 2)
# The expected polar coordinates are
rs_expected <- c(0, 1, sqrt(2), sqrt(8))
ths_expected <- c(0, pi/2, pi/4, pi/4)
# Calculate using the function
p <- get_polar_coordinates(xs, ys)
# Check that the results match
expect_equal(rs_expected, p$r)
expect_equal(ths_expected, p$th)
})
test_that('Polar coordinates (with shift)', {
# Create some points in cartesian coordinates
xs <- c(0, 0, 1, 2) + 2
ys <- c(0, 1, 1, 2) + 1
# The expected polar coordinates are
rs_expected <- c(0, 1, sqrt(2), sqrt(8))
ths_expected <- c(0, pi/2, pi/4, pi/4)
# Calculate using the function
p <- get_polar_coordinates(xs, ys, origin = c(2, 1))
# Check that the results match
expect_equal(rs_expected, p$r)
expect_equal(ths_expected, p$th)
})
```

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