List.assign - Maple Programming Help

Home : Support : Online Help : Programming : OpenMaple : Java Application Programming Interface : List Class : OpenMaple/Java/List/assign

List.assign

assign a value to an element of the list

 Calling Sequence void assign( int i, Algebraic val ) throws MapleException

Parameters

 i - index of the entry to assign val - value to assign to the list

Description

 • The assign function assigns the Algebraic object val into the element of the List indexed by i.
 • The assign function can be called only on an List that is not a unique representation. For more information, see unique).
 • Valid values of i are $1..n$ where $n$ is the length of the list.  The length can be obtained by calling numElements.

Examples

 import com.maplesoft.openmaple.*; import com.maplesoft.externalcall.MapleException; class Example { public static void main( String notused[] ) throws MapleException { String[] mapleArgs = { "java" }; Engine engine = new Engine( mapleArgs, new EngineCallBacksDefault(), null, null ); List l = (List)engine.evaluate( "[1,2,3]:" ); try { l.assign( 1, engine.newNumeric( 2.2 ) ); } catch ( MapleException me ) { System.out.println( me.getMessage() ); } l = engine.newList( 3 ); l.assign( 1, engine.newNumeric( 1 ) ); l.assign( 2, engine.newNumeric( 2 ) ); l.assign( 3, engine.newNumeric( 3 ) ); l = (List)l.unique(); System.out.println( l ); } }

Executing this code produces the following output.

 Error, lists from Maple cannot be modified in-place [1, 2, 3]