org.lsmp.djep.vectorJep.function.Transpose Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jep Show documentation
Show all versions of jep Show documentation
JEP is a Java library for parsing and evaluating mathematical expressions.
The newest version!
/* @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;
/**
* Transpose a matrix.
* trans([[1,2],[3,4]]) -> [[1,3],[2,4]]
*
* @author Rich Morris
* Created on 13-Feb-2005
*/
public class Transpose extends PostfixMathCommand implements UnaryOperatorI
{
public Transpose()
{
super();
this.numberOfParameters = 1;
}
public Dimensions calcDim(Dimensions ldim)
{
return Dimensions.valueOf(ldim.getLastDim(),ldim.getFirstDim());
}
public MatrixValueI calcValue(MatrixValueI res, MatrixValueI lhs)
throws ParseException
{
if(!(res instanceof Matrix))
throw new ParseException("transpose: result must be a matrix");
if(!(lhs instanceof Matrix))
throw new ParseException("transpose: argument must be a matrix");
Matrix resmat = (Matrix) res;
Matrix mat = (Matrix) lhs;
if( resmat.getNumCols() != mat.getNumRows()
|| resmat.getNumRows() != mat.getNumCols())
throw new ParseException("transpose, dimension of result is wrong res "+resmat.getDim()+" arg "+mat.getDim());
for(int i=0;i