Table.select - Maple Programming Help

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Table.select

access the element associated with a key

 

Calling Sequence

Parameters

Description

Examples

Calling Sequence

Algebraic select( Algebraic key ) throws MapleException

Parameters

key

-

index of the element to access

Description

• 

The select function retrieves the Algebraic object associated with key in the Table. If no element is associated with key, an error is raised.

• 

To check whether 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 = { "java" };

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

        Table 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