assign a value to an element of the list - Maple Help

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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 length.

Examples

import com.maplesoft.openmaple.*;

import com.maplesoft.externalcall.MapleException;

class Example

{

    public static void main( String notused[] ) throws MapleException

    {

    String mapleArgs[];

    Engine engine;

    List l;

    mapleArgs = new String[1];

    mapleArgs[0] = "java";

    engine = new Engine( mapleArgs, new EngineCallBacksDefault(),

        null, null );

    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]

See Also

ExternalCalling/Java/MapleException, OpenMaple, OpenMaple/Java/Algebraic, OpenMaple/Java/API, OpenMaple/Java/List, OpenMaple/Java/List/length, OpenMaple/Java/List/select


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