padarray(1:4, c(0, 2)) # 0 0 [1 2 3 4] 0 0
padarray(1:4, c(0, 2), -1) # -1 -1 [1 2 3 4] -1 -1
padarray(1:4, c(0, 2), -1, "post") # [1 2 3 4] -1 -1
padarray(1:4, c(0, 3), "symmetric", "pre") # 3 2 1 [1 2 3 4]
padarray(letters[1:5], c(0, 3), "replicate") # a a a [a b c d e] e e e
padarray(letters[1:5], c(0, 3), "circular", "post") # [a b c d e] a b c
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