Table.select - access the element associated with a key
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Calling Sequence
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void select( Algebraic key ) throws MapleException
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Parameters
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key
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-
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index of the element to access
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Description
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The select function returns the Algebraic object associated with key in the Table.
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If no element is associated with key, an error is raised.
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To determine if an element is associated with key, use the has function.
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Examples
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import com.maplesoft.openmaple.*;
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import com.maplesoft.externalcall.MapleException;
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class Example
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{
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public static void main( String notused[] ) throws MapleException
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{
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String mapleArgs[];
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Engine engine;
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Table t;
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mapleArgs = new String[1];
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mapleArgs[0] = "java";
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engine = new Engine( mapleArgs, new EngineCallBacksDefault(),
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null, null );
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t = (Table)engine.evaluate( "table([(1)=100,(2)=200,(3)=300,(4)=400]):" );
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System.out.println( t.select( engine.newNumeric( 1 ) ) );
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System.out.println( t.select( engine.newNumeric( 2 ) ) );
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System.out.println( t.select( engine.newNumeric( 3 ) ) );
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try
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{
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t.select( engine.newNumeric( 10 ) );
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}
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catch ( MapleException me )
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{
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System.out.println( me.getMessage() );
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}
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}
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}
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Executing this code produces the following output.
100
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200
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300
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No such key in table
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Download Help Document
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