All Packages  Class Hierarchy  This Package  Previous  Next  Index

Class graph.ParseFunction

java.lang.Object
   |
   +----graph.ScanString
           |
           +----graph.ParseFunction

public class ParseFunction

extends ScanString

Known Bugs This class is not fool proof. If the answer is wrong then use the parenthesis to force the order of evaluation. The most likely place this will be needed is in the use of the power command. The exponent is not evaluated correctly if it begins with a unary operator.

List of recognised commands

• ( ) parenthesis , comma
• +, -, unary -, unary +
• *, /
• ^ (raise to a power)
• pi, e, All the constants in class SpecialFunction
• log
• sin, cos, tan
• asin, acos, atan
• sqrt
• rand
• exp
• remainder
• atan2
• All the functions in class SpecialFunction
• Independent variables x,y,z
• Scientific notation using "e", "E", "d", "D".

Version:

1.8, 1996/08/12 23:37:08

Author:

Leigh Brookshaw

debug

Debug variable.

ParseFunction()

Instantiate the class

ParseFunction(String)

Instantiate the class and define the string to parse.

getResult()

Return the solution of the function if it has no independent values or they have already been set using the set methods

getResult(double)

Return the solution of the function given the independent values

getResult(double, double)

Return the solution of the function given the independent values

getResult(double, double, double)

Return the solution of the function given the independent values

getResults(int, double[])

Return an array of solutions given an array of x values

getResults(int, double[], double[])

Return an array of solutions given an array of x values and y values

getResults(int, double[], double[], double[])

Return an array of solutions given an array of x values, y values and z values.

getVariables()

Return a boolean array with index 0 true if the independent variable x was found in the function, index 1 true if y was found, and index 2 true if z was found.

parse()

Parse the previously set string

parse(String)

Parse the string.

setX(double)

Set the value of the independent variable X.

setY(double)

Set the value of the independent variable Y.

setZ(double)

Set the value of the independent variable Z.

  public boolean debug

Debug variable. If set true debug output is printed.

  public ParseFunction()

Instantiate the class

  public ParseFunction(String s)

Instantiate the class and define the string to parse.

Parameters:

s - The string to be parsed.

  public boolean parse(String s)

Parse the string.

Parameters:

s - The string to parse

Returns:

true if it was successful, false otherwise.

  public boolean parse()

Parse the previously set string

Returns:

true if it was successful, false otherwise.

  public double getResult(double x,
                          double y,
                          double z) throws Exception

Return the solution of the function given the independent values

Parameters:

x - indpendent x value

y - indpendent y value

z - indpendent z value

Returns:

solution of the function

  public double getResult(double x,
                          double y) throws Exception

Return the solution of the function given the independent values

Parameters:

x - indpendent x value

y - indpendent y value

Returns:

solution of the function

  public double getResult(double x) throws Exception

Return the solution of the function given the independent values

Parameters:

x - indpendent x value

Returns:

solution of the function

  public double getResult() throws Exception

Return the solution of the function if it has no independent values or they have already been set using the set methods

Returns:

solution of the function

See Also:

setX(), setY(), setZ()

  public double[] getResults(int n,
                             double x[]) throws Exception

Return an array of solutions given an array of x values

Parameters:

n - number of values to process in the input array

x - Array containing the x values.

Returns:

Array containing the solutions.

Throws: Exception

Generic exception if the array index n<=0, or x is null.

  public double[] getResults(int n,
                             double x[],
                             double y[]) throws Exception

Return an array of solutions given an array of x values and y values

Parameters:

n - number of values to process in the input array

x - Array containing the x values.

y - Array containing the y values.

Returns:

Array containing the solutions.

Throws: Exception

Generic exception if the array index n<=0, or x is null, or y is null.

  public double[] getResults(int n,
                             double x[],
                             double y[],
                             double z[]) throws Exception

Return an array of solutions given an array of x values, y values and z values.

Parameters:

n - number of values to process in the input array

x - Array containing the x values.

y - Array containing the y values.

Returns:

Array containing the solutions.

Throws: Exception

Generic exception if the array index n<=0, or x is null, or y is null, or z is null.

  public boolean[] getVariables()

Return a boolean array with index 0 true if the independent variable x was found in the function, index 1 true if y was found, and index 2 true if z was found.

  public void setX(double x)

Set the value of the independent variable X.

  public void setY(double y)

Set the value of the independent variable Y.

  public void setZ(double z)

Set the value of the independent variable Z.

All Packages  Class Hierarchy  This Package  Previous  Next  Index