unassign - Maple Help
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Table.unassign

remove the element associated with a key

 

Calling Sequence

Parameters

Description

Examples

Calling Sequence

void unassign( Algebraic key ) throws MapleException

Parameters

key

-

index of the element to access

Description

• 

The unassign function unassigns the Algebraic object associated with key from the Table. If no element is associated with key, no error is raised.

• 

This function is identical to unassign except that it throws a MapleException.

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]):" );

        Numeric n = engine.newNumeric( 1 );

        System.out.println( t.has( n ) );

        t.unassign( n );

        System.out.println( t.has( n ) );

        n = engine.newNumeric( 2 );

        System.out.println( t.has( n ) );

        t.unassign( n );

        System.out.println( t.has( n ) );

        n = engine.newNumeric( 3 );

        System.out.println( t.has( n ) );

        t.unassign( n );

        System.out.println( t.has( n ) );

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

    }

}

Executing this code produces the following output.

true

false

true

false

true

false

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

OpenMaple/Java/Table/select