Reverse

new to Analytica 4.7

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».

Examples

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 ])

Notes

Reverse(x,I) is equivalent to x[@I=size(I)+1-@I].

See also

• Subscript-Slice Operator, Slice()
• Sort, Sequence