Use data .- centroids[1, :]' to transpose centroids[1,:] to a 1 \times 2 row vector.
See also Unintuitive Julia result: selecting a row from a matrix
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Use data .- centroids[1, :]' to transpose centroids[1,:] to a 1 \times 2 row vector.
See also Unintuitive Julia result: selecting a row from a matrix