Description:
Get members of a sequence at specified positions to form a new sequence.
Syntax:
A.m(a:b,c,d:e)
Note:
A is a sequence whose length is n, from which you get members at specified positions to form a new sequence, with the condition -n£a£n & a!=0. If 1£a£n, it is the ath member of sequence A when counted from left to right; if -n£ a £-1, it is the ath member of sequence A when counted from right to left. The rules also apply to b, c, d, and e. So, the function is often used to get members of a sequence backwards. The members a and d represent must be respectively on the left side of the members b and e designate. When the parameter on the left side of the colon is omitted, the default value is 1; when the parameter on the right side of the colon is omitted, the default value is -1.
Parameter:
|
A |
A sequence |
|
a/d |
An integer; 1 by default |
|
b/e |
An integer; -1 by default |
|
c |
An integer |
Return value:
A sequence
Example:
|
|
A |
|
|
1 |
=to(1,100).m(1:3,9,97:) |
[1,2,3,9,97,98,99,100] |
|
2 |
=to(1,100).m(:5,-1,66:-32) |
[1,2,3,4,5,100,66,67,68,69] |