Reverse

Release:	… • 4.6 • 5.0 • 5.1 • 5.2 • 5.3 • 5.4 • • 6.0 • 6.1 • 6.2 • 6.3 • 6.4 • 6.5 • 6.6 • 7.0

Reverse( x, I, posFirst, posLast)

Reverses the items in array «x» along index «I». The result is still indexed by «I».

Use the optional «posFirst» and «posLast» to reverse the order of a sub-sequence along «I».

Suppose

Index J := 1..6

Variable a := J^2

Reverse(a,J) → Array(J, [ 36, 25, 16, 9, 4, 1 ])

Reverse(a,J,posFirst:3) → Array(J, [ 1,4, 36, 25, 16, 9 ])

Reverse(a,J,posLast:4) → Array(J, [ 16, 9, 4, 1, 25, 36 ])

Reverse(a,J,posFirst:3, posLast:5) → Array(J, [ 1, 4, 25, 16, 9, 36 ])

Reverse does not reverse the characters in a text value, since a text value is not an array. See TextReverse for a User-Defined Function that does this.