assign - Maple Help

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Expseq.assign

assign a value into an element of the expression sequence

 Calling Sequence void assign( int i, Algebraic val ) throws MapleException

Parameters

 i - index of the entry to assign val - value to assign into the expression sequence

Description

 • The assign function assigns the Algebraic object val into the element of the Expseq indexed by i.
 • The assign function can only be called on an Expseq, which is not a unique representation. For more information, see unique.
 • Valid values of i are $1..n$ where $n$ is the length of the expression sequence.  The length can be obtained by calling numElements.

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 ); Expseq e = (Expseq)engine.evaluate( "1,2,3:" ); try { e.assign( 1, engine.newNumeric( 2.2 ) ); } catch ( MapleException me ) { System.out.println( me.getMessage() ); } e = engine.newExpseq( 3 ); e.assign( 1, engine.newNumeric( 1 ) ); e.assign( 2, engine.newNumeric( 2 ) ); e.assign( 3, engine.newNumeric( 3 ) ); e = (Expseq)e.unique(); System.out.println( e ); } }

Executing this code produces the following output.

 Error, expression sequences from Maple cannot be modified in-place [1, 2, 3]