org.lsmp.djep.vectorJep.function.Diagonal Maven / Gradle / Ivy
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JEP is a Java library for parsing and evaluating mathematical expressions.
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/* @author rich
* Created on 13-Feb-2005
*
* See LICENSE.txt for license information.
*/
package org.lsmp.djep.vectorJep.function;
import java.util.Stack;
import org.lsmp.djep.vectorJep.Dimensions;
import org.lsmp.djep.vectorJep.values.*;
import org.nfunk.jep.ParseException;
import org.nfunk.jep.function.PostfixMathCommand;
/**
* Creates a diagonal matrix, with a given vector as diagonals elements.
* diag([1,2,3]) -> [[1,0,0],[0,2,0],[0,0,3]]
*
* @author Rich Morris
* Created on 13-Feb-2005
*/
public class Diagonal extends PostfixMathCommand implements UnaryOperatorI
{
public Diagonal()
{
super();
this.numberOfParameters = 1;
}
public Dimensions calcDim(Dimensions ldim)
{
return Dimensions.valueOf(ldim.numEles(),ldim.numEles());
}
public MatrixValueI calcValue(MatrixValueI res, MatrixValueI lhs)
throws ParseException
{
Matrix mat = (Matrix) res;
int n = lhs.getNumEles();
for(int i=0;i