net.sourceforge.webcompmath.data
Class Cases

java.lang.Object
  net.sourceforge.webcompmath.data.Cases

public class Cases
extends java.lang.Object

An object of type Cases stores a list of "case values" that is generated while an expression is being evaluated using the routine Expression.getValuesWithCases(). This information can be used as a heuristic (i.e. a fudge) to help detect a possible discontinuity between two evaluations of the expression. Suppose that the expression is evaluated twice, with some change of variable values between the two evaluations. If the variables' values are not changed too much, and if the Cases objects generated by the two evaluations are equal (as determined by the "equals" method defined in this class), then it is likely that there is no discontinuity. (However, this is not perfect. The discontinuity in 1/x^2 won't be detected since the case value generated by 1/f(x) only checks the sign of f(x), and the denominator of 1/x^2 is positive on both sides of x=0. If you want to be more paranoid, check both the expression and its derivative.) (I really don't like this very much, but it can be used to draw pretty good graphs in general.)

Constructor Summary

Cases()

Method Summary

void	addCase(int value) Add a new case value to the list stored in this object.
void	clear() Remove all the cases that have been added with addCase().
boolean	equals(Cases c) Test whether c contains exactly the same list of case values as this Cases object does.

Methods inherited from class java.lang.Object

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

Constructor Detail

Cases

public Cases()

Method Detail

clear

public void clear()

Remove all the cases that have been added with addCase(). This makes it possible to reuse this object in another call to Expression.getValueWithCases().

addCase

public void addCase(int value)

Add a new case value to the list stored in this object.

Parameters:

value - value to add

equals

public boolean equals(Cases c)

Test whether c contains exactly the same list of case values as this Cases object does.

Parameters:

c - cases to compare

Returns:

true or false