org.lsmp.djep.vectorJep.function

Class Ele

java.lang.Object

org.nfunk.jep.function.PostfixMathCommand

org.lsmp.djep.vectorJep.function.Ele

All Implemented Interfaces:

BinaryOperatorI, PostfixMathCommandI

public class Ele
extends PostfixMathCommand
implements BinaryOperatorI

ele(x,i) returns the i-th element of a vector x. ele(m,[i,j]) returns the (i-th,j-th) element of a matrix m. Note this follows the mathematical indexing convention with indices starting from 1 rather than the computer science convention with indices starting from 0. Hence a = [1,2,3,4]; ele(a,1); // returns 1 m = [[1,2],[3,4]]; ele(m,[2,2]); // return 4 New parser feature allow a[] notation to be used. a=[1,2,3,4]; a[3]; // returns 3 b=[[1,2],[3,4]]; b[1,2]; // returns 2

Author:

Rich Morris Created on 15-Nov-2003

Field Summary

Fields inherited from class org.nfunk.jep.function.PostfixMathCommand

curNumberOfParameters, numberOfParameters

Constructor Summary

Constructors

Constructor and Description
Ele()

Method Summary

Modifier and Type	Method and Description
Dimensions	calcDim(Dimensions ldim, Dimensions rdim) Find the dimensions of this operator when applied to arguments with given dimensions.
MatrixValueI	calcValue(MatrixValueI res, MatrixValueI param1, MatrixValueI param2) Calculates the value of this operator for given input with results stored in res.
void	run(Stack stack) Throws an exception because this method should never be called under normal circumstances.

Methods inherited from class org.nfunk.jep.function.PostfixMathCommand

checkNumberOfParameters, checkStack, getNumberOfParameters, setCurNumberOfParameters

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.nfunk.jep.function.PostfixMathCommandI

checkNumberOfParameters, getNumberOfParameters, setCurNumberOfParameters

Constructor Detail

Ele

public Ele()

Method Detail

calcDim

public Dimensions calcDim(Dimensions ldim,
                          Dimensions rdim)
                   throws ParseException

Description copied from interface: BinaryOperatorI

Find the dimensions of this operator when applied to arguments with given dimensions.

Specified by:

calcDim in interface BinaryOperatorI

Throws:

ParseException

calcValue

public MatrixValueI calcValue(MatrixValueI res,
                              MatrixValueI param1,
                              MatrixValueI param2)
                       throws ParseException

Description copied from interface: BinaryOperatorI

Calculates the value of this operator for given input with results stored in res. res is returned. Using this method is slightly faster than the standard run method as it eliminates the construction of tempoary objects.

Specified by:

calcValue in interface BinaryOperatorI

Throws:

ParseException

run

public void run(Stack stack)
         throws ParseException

Description copied from class: PostfixMathCommand

Throws an exception because this method should never be called under normal circumstances. Each function should use it's own run() method for evaluating the function. This includes popping off the parameters from the stack, and pushing the result back on the stack.

Specified by:

run in interface PostfixMathCommandI

Overrides:

run in class PostfixMathCommand

Throws:

ParseException