diff --git a/R/setdiff.R b/R/setdiff.R
new file mode 100644
index 0000000..49e5633
--- /dev/null
+++ b/R/setdiff.R
@@ -0,0 +1,13 @@
+#' @title Set differences of two arrays
+#' @description Loosely replicates the behavior of the homonym Matlab function
+#' @param A first array
+#' @param B second awway
+#' @param legacy if `TRUE`, preserves the behavior of
+#' @return
+#' @author Waldir Leoncio
+#' @export
+setdiff <- function(A, B, legacy = FALSE) {
+	values <- sort(unique(A[is.na(match(A, B))]))
+	# browser() # TEMP
+	return(values)
+}
\ No newline at end of file
diff --git a/tests/testthat/test-convertedBaseFunctions.R b/tests/testthat/test-convertedBaseFunctions.R
index 11988f8..08e36cc 100644
--- a/tests/testthat/test-convertedBaseFunctions.R
+++ b/tests/testthat/test-convertedBaseFunctions.R
@@ -158,10 +158,10 @@ test_that("find works as expected", {
 })
 
 test_that("sortrows works as expected", {
-	 mx <- matrix(c(3, 2, 2, 1, 1, 10, 0, pi), 4)
-	 expect_equal(sortrows(mx), matrix(c(1, 2, 2, 3, pi, 10, 0, 1), 4))
-	 expect_equal(sortrows(mx, 2), matrix(c(2, 3, 1, 2, 0, 1, pi, 10), 4))
-	 expect_equal(sortrows(mx, 1:2), mx[order(mx[, 1], mx[, 2]), ])
+	mx <- matrix(c(3, 2, 2, 1, 1, 10, 0, pi), 4)
+	expect_equal(sortrows(mx), matrix(c(1, 2, 2, 3, pi, 10, 0, 1), 4))
+	expect_equal(sortrows(mx, 2), matrix(c(2, 3, 1, 2, 0, 1, pi, 10), 4))
+	expect_equal(sortrows(mx, 1:2), mx[order(mx[, 1], mx[, 2]), ])
 })
 
 test_that("cell works as expected", {
@@ -217,4 +217,11 @@ test_that("nargin works correctly", {
 	expect_equal(addme(13, 42), 55)
 	expect_equal(addme(13), 26)
 	expect_equal(addme(), 0)
+})
+
+test_that("setdiff works as expected", {
+	A <- c(3, 6, 2, 1, 5, 1, 1)
+	B <- c(2, 4, 6)
+	expect_equal(setdiff(A, B), list(c(1, 3, 5), 4, 1, 5))
+	# TODO: add more examples from https://se.mathworks.com/help/matlab/ref/double.setdiff.html;jsessionid=0d8d42582d4d299b8224403899f1
 })
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