Class TableExample4

java.lang.Object

TableExample4

public class TableExample4
extends java.lang.Object

Class: TableExample4.
Description: This example illustrates how to use the buildFromInfix and evaluate methods in the ExprEvaluator class to process polar coordinate functions. The example is rather unusual in that it inputs expressions for both the radius and angle theta. In cases where there is only one function for the radius which is function of theta, then one could use use buildFromInfix and evaluate in the style of example 1 (that is, avoiding explicit references to a ExprTree).

This example uses setValueOf to set the value of t and convertToRect to convert r and theta into rectangular coordinates x and y.

The output is printed in a table which could be used to create graph. Parameter t is incremented by PI/20 (about 0.15708) each time.

Sample input to produce values for a 3-leaf rose:
Enter the first value for t: 0
Enter the last value of t: 6.2832
Enter the expression for o (theta) as a function of t: t/2
Enter the expression for r as a function of t or o (theta): cos(3*o)

If more than 2 functions are processed, it many be convenient to create arrays for r, theta, and tree and use a loop to process them.

Requires:
ExprEvaluator.java
EasyFormat.java
DoubleScanner.java

Constructor Summary

Constructors

Constructor and Description
TableExample4() Constructor for TableExample4.

Method Summary

Modifier and Type	Method and Description
static void	main(java.lang.String[] args) Trivial main program that starts the application.

Methods inherited from class java.lang.Object

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

Constructor Detail

TableExample4

public TableExample4()

Constructor for TableExample4. Calulates theta and r as functions of t and then converts theta and r into rectangular cordinates. (Functions for theta and r are input by the user.) Prints results in a table.

Method Detail

main

public static void main(java.lang.String[] args)

Trivial main program that starts the application.