ifirstHit

ifirstHit(func, X, target)

func can only be the following operators: >, >=, <, <=, !=, <>, ==.

X is a vector/matrix/table.

target is a scalar of the same type as X indicating the value to be compared with X.

Return the index of the first element in X that satisfies the condition X func target (e.g. X>5).

If no element in X satisfies the condition, return -1.

NULL values are ignored in ifirstHit.

• Use ifirstNot to find the index of the first non-NULL value.

• Use find to find the index of the first NULL value.

   
   :emphasize-lines: 2, 6

    $ X = NULL 3.2 4.5 1.2 NULL 7.8 0.6 9.1
    $ ifirstHit(<, X, 2.5)
    3

    // return -1 if no element in X satisfies the condition.
    $ ifirstHit(>, X, 10.0)
    -1

Related function: firstHit