Difference between revisions of "KeepIf Command"
From GeoGebra Manual
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| − | <noinclude>{{Manual Page|version= | + | <noinclude>{{Manual Page|version=5.0}}</noinclude>{{command|logical}} |
| − | {{command|logical}} | + | ; KeepIf( <Condition>, <List> ): Creates a new list that only contains those elements of the initial list that fulfil the condition. |
| − | ; KeepIf | + | : {{Example|1=<code>KeepIf(x<3, {1, 2, 3, 4, 1, 5, 6})</code> returns the new list ''{1, 2, 1}''.}} |
| − | : {{Example|1=<code>KeepIf | ||
:{{note|1=For list of numbers arbitrary condition may be used. For list of other objects one can use only conditions of the form <code>x==constant</code> or <code>x!=constant</code>.}} | :{{note|1=For list of numbers arbitrary condition may be used. For list of other objects one can use only conditions of the form <code>x==constant</code> or <code>x!=constant</code>.}} | ||
| − | ; KeepIf | + | ; KeepIf( <Condition>, <Variable>, <List> ) |
| − | : This syntax allows a more flexible condition | + | : This syntax allows a more flexible condition. |
| + | : {{Example|1=For Points ''P, Q, R'' <code>KeepIf(x(A) < 3, A, {P, Q, R})</code> will filter the points whose ''x''-coordinate is less than ''3'' out of the list. The variable ''A'' is replaced in turn with ''P'' then ''Q'' then ''R'' for the check.}} | ||
Latest revision as of 19:43, 30 September 2017
- KeepIf( <Condition>, <List> )
- Creates a new list that only contains those elements of the initial list that fulfil the condition.
- Example:
KeepIf(x<3, {1, 2, 3, 4, 1, 5, 6})returns the new list {1, 2, 1}.
- Note: For list of numbers arbitrary condition may be used. For list of other objects one can use only conditions of the form
x==constantorx!=constant.
- KeepIf( <Condition>, <Variable>, <List> )
- This syntax allows a more flexible condition.
- Example: For Points P, Q, R
KeepIf(x(A) < 3, A, {P, Q, R})will filter the points whose x-coordinate is less than 3 out of the list. The variable A is replaced in turn with P then Q then R for the check.
