Macaulay2 » Documentation
Packages » Macaulay2Doc » The Macaulay2 language » lists and sequences » isMember

next | previous | forward | backward | up | index | toc

isMember -- test membership in a list or set

Usage:

isMember(e,x)
Inputs:
- e, a thing,
- x, a list, a sequence, or a set,
Outputs:
- a Boolean value, whether e is in the list, sequence, or set x;

Description

i1 : isMember(c,{a,b,c,d,e})

o1 = true

i2 : isMember(f,(a,b,c,d,e))

o2 = false

i3 : isMember(3,set{1,2,5,6})

o3 = false

This function may also be called using the synonym member.

See also

positions -- which elements of a list satisfy a condition
Set -- the class of all sets

Ways to use isMember:

isMember(Thing,Set)
isMember(Thing,VisibleList)
isMember(QQ,RRi) -- membership test in an interval
isMember(RR,RRi) -- see isMember(QQ,RRi) -- membership test in an interval
isMember(ZZ,RRi) -- see isMember(QQ,RRi) -- membership test in an interval
isMember(Number,Ideal) -- see isMember(RingElement,Ideal) -- test membership in an ideal
isMember(RingElement,Ideal) -- test membership in an ideal

For the programmer

The object isMember is a method function.

The source of this document is in /build/macaulay2-88fgJW/macaulay2-1.25.11+ds/M2/Macaulay2/packages/Macaulay2Doc/functions/member-doc.m2:26:0.