dagEquals - Maple Help

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 = { "java" }; Engine kernel = new Engine( mapleArgs, new EngineCallBacksDefault(), null, null ); Algebraic a1, a2, a3; 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