Here’s how to use m() function.
Description:
Get members at specified positions.
Syntax:
|
A.m(i) |
n is the lengh of sequence A, -n£i£n and i is not equal to 0; 1<=i<=n indicates getting the ith member; -n<=i<=-1 indicates getting the ith member from the bottom |
|
A.m(P) |
P is a non-zero n-integer sequence |
Note:
A is a sequence whose length is n, from which you get members at specified positions. The function is generally used to get members of a sequence from backwards to forwards.
Parameter:
|
A |
A sequence expression |
|
i |
An integer |
|
P |
A non-zero n-integer sequence |
Option:
|
@r |
Turn back if the specified position exceeds the boundary of A, that is, if the integer i that exceeds the limit of sequence A can be fully divided by n, i is equal to n; otherwise, i is equal to the remaider of i divided by n |
|
@0 |
The member represented by a sequence number that exceeds the boundary of A will be excluded from the result. |
Return value:
A value or a sequence composed of the members at the specified positions in sequence A
Example:
|
|
A |
|
|
1 |
[a,b,c,d,e,f,g,h,i,j] |
|
|
2 |
=A1.m(2) |
b |
|
3 |
=A1.m(-2) |
i |
|
4 |
=A1.m([2,3]) |
[b,c] |
|
5 |
=A1.m([-2,-3]) |
[i,h] |
|
6 |
=A1.m@0([5,12]) |
[e] |
|
7 |
=A1.m@r([5,12]) |
[e,b] |
Related function:
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] |