test the expressions represented by two Algebraics for equality - Maple Help

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Algebraic.dagEquals - test the expressions represented by two Algebraics for equality

Calling Sequence

boolean dagEquals( Algebraic algeb ) throws MapleException

Parameters

algeb

-

Algebraic to compare against

Description

• 

The dagEquals function compares the expression represented by the current Algebraic object with the expression represented by algeb.  If the expressions are the same, then true is returned, otherwise false is returned.

• 

If the current Algebraic object is not in its unique representation (see unique), then the dagEquals function returns false, even if the expressions are the same.

Examples

import com.maplesoft.openmaple.*;

import com.maplesoft.externalcall.MapleException;

class Example

{

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

    {

        String mapleArgs[];

        Engine kernel;

        Algebraic a1, a2, a3;

        mapleArgs = new String[1];

        mapleArgs[0] = "java";

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

                null, null );

        a1 = kernel.evaluate( "1:" );

        a2 = kernel.evaluate( "2:" );

        a3 = kernel.evaluate( "1:" );

        if ( a1 == a2 || a2 == a3 || a1 == a3 )

        {

            System.out.println( "equal objects" );

        }

    else

    {

            System.out.println( "all java object are unequal" );

    }

        if ( a1.dagEquals( a2 ) || a2.dagEquals( a3 ) )

        {

            System.out.println( "equal dags" );

        }

    else

    {

            System.out.println( "the dag for 1 not equal to the dag for 2" );

    }

        if ( ! a1.dagEquals( a3 ) )

        {

            System.out.println( "unequal dags" );

        }

    else

    {

        System.out.println( "equal dags" );

    }

    }

}

Executing this code should produce the following output.

all java object are unequal

dag for 1 not equal to the dag for 2

equal dags

See Also

ExternalCalling/Java/MapleException, OpenMaple, OpenMaple/Java/Algebraic, OpenMaple/Java/Algebraic/unique, OpenMaple/Java/API, OpenMaple/Java/Engine/evaluate, OpenMaple/Java/memory


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