jmathlib.toolbox.jmathlib.matrix
Class lowertriangle

java.lang.Object
  extended by jmathlib.core.interpreter.RootObject
      extended by jmathlib.core.functions.Function
          extended by jmathlib.core.functions.ExternalFunction
              extended by jmathlib.toolbox.jmathlib.matrix.lowertriangle
All Implemented Interfaces:
java.io.Serializable, java.lang.Cloneable, ErrorCodes, TokenConstants

public class lowertriangle
extends ExternalFunction

An external function for converting a matrix into lower triangular form

See Also:
Serialized Form

Field Summary
 
Fields inherited from class jmathlib.core.functions.ExternalFunction
IMAG, REAL
 
Fields inherited from class jmathlib.core.functions.Function
lastModified, name, pathAndFileName
 
Fields inherited from interface jmathlib.core.constants.ErrorCodes
ERR_BRACKET_OPEN, ERR_BRACKET_ORDER, ERR_FUNCTION_NOT_FOUND, ERR_FUNCTION_NOT_IMPLEMENTED, ERR_INSUFFICIENT_PARAMETERS, ERR_INVALID_PARAMETER, ERR_LVALUE_REQUIRED, ERR_MATRIX_SINGULAR, ERR_NOT_SQUARE_MATRIX, ERR_OPNOTSUPPORTED, ERR_TOO_MANY_PARAMETERS, ERR_USER_ERROR, ERR_VARIABLE_NOTDEFINED, OK, OK_FUNCTION_PROCESS
 
Fields inherited from interface jmathlib.core.constants.TokenConstants
ADDSUB_PRIORITY, AND_PRIORITY, ANDAND_PRIORITY, ASSIGN_PRIORITY, BRACKET_PRIORITY, COMPARE_PRIORITY, CONCAT, MATRIX, MULDIV_PRIORITY, OR_PRIORITY, OROR_PRIORITY, PARAMETER, POWER_PRIORITY, RELATION_PRIORITY, SINGLE, ttDelimiter, ttNotSet, ttOperand, ttOperator
 
Constructor Summary
lowertriangle()
           
 
Method Summary
private  double[][] calcLowerTriangle(double[][] values, int size)
          Convert the matrix into lower triangular form by swapping rows then adding rows together
private  double[][] checkRows(double[][] values, int size)
          makes sure that the values on the primary diagonal are not zero. swapping rows if nescessary
 OperandToken evaluate(Token[] operands, GlobalValues globals)
          Executes the function
 
Methods inherited from class jmathlib.core.functions.ExternalFunction
getParamCount
 
Methods inherited from class jmathlib.core.functions.Function
debugLine, equals, getLastModified, getName, getNArgIn, getNArgOut, getNoOfLeftHandArguments, getPathAndFileName, setLastModified, setName, setNoOfLeftHandArguments, setPathAndFileName, throwMathLibException
 
Methods inherited from class jmathlib.core.interpreter.RootObject
clone, toString
 
Methods inherited from class java.lang.Object
finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

lowertriangle

public lowertriangle()
Method Detail

evaluate

public OperandToken evaluate(Token[] operands,
                             GlobalValues globals)
Description copied from class: Function
Executes the function

Specified by:
evaluate in class Function
Parameters:
operands - - an array of the functions paramaters
globals - TODO
Returns:
the result as an OperandToken

calcLowerTriangle

private double[][] calcLowerTriangle(double[][] values,
                                     int size)
Convert the matrix into lower triangular form by swapping rows then adding rows together


checkRows

private double[][] checkRows(double[][] values,
                             int size)
makes sure that the values on the primary diagonal are not zero. swapping rows if nescessary


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