findduplicate(X)

find duplicate rows in a table, timetable or array.

ind=findduplicate(X) returns a linear index ind for duplicate records in X.
findduplicate treat each row in X as a record.
input:
-X: vector, array, table or timetable.
output:
-ind: linear index for duplicated records in X
tip: to find duplicate values in a matrix, use findduplicate(X(:))

Example:
findduplicate(string(
{'John','Waston';...
'Anna','Blei';...
'John','Waston'}
))
returns 3