KeepIf 指令
来自GeoGebra Manual
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- KeepIf[ <Condition>, <List> ]
- KeepIf[Condition, List]
- Creates a new list that only contains those elements of the initial list that fulfil the condition.
- 范例:
KeepIf[x<3, {1, 2, 3, 4, 1, 5, 6}]
returns the new list {1, 2, 1}.
备注: For list of numbers arbitrary condition may be used. For list of other objects one can use only conditions of the form
x==constant
or x!=constant
.