Package com.machconsulting.math

Class RPN

java.lang.Object

com.machconsulting.math.RPN

public class RPN
extends java.lang.Object

RPN Executor

Author:

Mike Hansen Method executes RPN commands against commands and variables stored...

Constructor Summary

Constructors

Constructor	Description
RPN()
RPN(Variables variables)

Method Summary

Modifier and Type	Method	Description
double	execute(java.lang.String cmd)	Executes the RPN string...
Variables	getVariables()	Return Variables class to be used by RPN Execution class

Methods inherited from class java.lang.Object

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

Constructor Detail

RPN

public RPN()

RPN

public RPN(Variables variables)

Method Detail

execute

public double execute(java.lang.String cmd)
               throws MathException

Executes the RPN string...

Parameters:

cmd -

Returns:

result

Throws:

MathException - Variables are any commands that start with a letter and that is not one of the reserved keywords. X is always the first on the stack. Y is always second on the stack. RPN uses a permissive stack. You can write or read any value to/from the stack without error. If you have stacked three variables and try to access the fourth variable you will get 0.0 and no error. Likewise if you try to write to the fourth variable the value written will be lost. No errors are returned from the stack. Reserved keywords:
+ : sum x+y
- : subtract x-y
* : multiply x*y
/ : divide x/y
1/x : invert 1/x
pow : power x^y
log : natural log
log10 : 10 based log
sin : sine x (x in radians)
cos : sine x (x in radians)
tan : tangent x (x in radians)
asin : arc sine x (result in radians)
acos : arc sine x (result in radians)
atan : arc tangent x (result in radians)
r>p : Convert cartesian coordinates x,y to r,angle (in radians)
p>r : Convert polar r,angle (in radians) to x,y
x<>y : Exchange x and y values
% : modulus of x and y
rad2deg : Convert x radians to degrees
deg2rad : Convert x degrees to radians
abs : Get absolute value of x
rand : Get random from 0 to x

getVariables

public Variables getVariables()

Return Variables class to be used by RPN Execution class

Returns:

variables