access the element associated with a key - Maple Help

Online Help

All Products    Maple    MapleSim


Home : Support : Online Help : Programming : OpenMaple : Java Application Programming Interface : Table Class : OpenMaple/Java/Table/select

Table.select - access the element associated with a key

Calling Sequence

void select( Algebraic key ) throws MapleException

Parameters

key

-

index of the element to access

Description

• 

The select function returns the Algebraic object associated with key in the Table.

• 

If no element is associated with key, an error is raised.

• 

To determine if an element is associated with key, use the has function.

Examples

import com.maplesoft.openmaple.*;

import com.maplesoft.externalcall.MapleException;

class Example

{

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

    {

    String mapleArgs[];

    Engine engine;

    Table t;

    mapleArgs = new String[1];

    mapleArgs[0] = "java";

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

        null, null );

    t = (Table)engine.evaluate( "table([(1)=100,(2)=200,(3)=300,(4)=400]):" );

    System.out.println( t.select( engine.newNumeric( 1 ) ) );

    System.out.println( t.select( engine.newNumeric( 2 ) ) );

    System.out.println( t.select( engine.newNumeric( 3 ) ) );

    try

    {

        t.select( engine.newNumeric( 10 ) );

    }

    catch ( MapleException me )

    {

        System.out.println( me.getMessage() );

    }

    }

}

Executing this code produces the following output.

100

200

300

No such key in table

See Also

ExternalCalling/Java/MapleException, OpenMaple, OpenMaple/Java/Algebraic, OpenMaple/Java/API, OpenMaple/Java/Table, OpenMaple/Java/Table/assign, OpenMaple/Java/Table/has, OpenMaple/Java/Table/remove


Download Help Document

Was this information helpful?



Please add your Comment (Optional)
E-mail Address (Optional)
What is ? This question helps us to combat spam