Package com.singularsys.extensions.xjep

Class XFunctionTable

java.lang.Object

com.singularsys.jep.FunctionTable

com.singularsys.jep.standard.StandardFunctionTable

com.singularsys.extensions.xjep.XFunctionTable

All Implemented Interfaces:

JepComponent, Serializable

public class XFunctionTable
extends StandardFunctionTable

Add the following functions to the standard function table:

• clean(expr) - clean an expression.
• eqn(expr) - extract the equation from an expression.
• eval(expr) - evaluate an expression,
• rewrite(expr) - rewrite an expression using a rewrite rules
• compare(expr1,expr2) - compare two expressions symbolically
• symequals(expr1,expr2) - check if two expressions are symbolically equal
• expand(expr) - expand an expression
• simplify(expr) - simplify an expression without expansion
• coeffs(expr,var) - return the coefficients of an expression in a variable

Also the rand functions uses DirtyRandom to prevents cleaning by ExpressionCleaner.

Name of the functions are read from the resource bundle, so they can be changed by providing a custom resource bundle.

See Also:

• Serialized Form

Field Summary

Fields inherited from class com.singularsys.jep.FunctionTable

table

Constructor Summary

Constructors

Modifier	Constructor	Description
	XFunctionTable()
	XFunctionTable(FunctionTable root)	Decorator constructor, replaces instances of Random by DirtyRandom.
protected	XFunctionTable(Map<String,PostfixMathCommandI> tbl)

Method Summary

Modifier and Type	Method	Description
protected void	addXFunctions()
FunctionTable	shallowCopy()	Returns a new shallow copy of this function table.

Methods inherited from class com.singularsys.jep.FunctionTable

addFunction, addFunctionIfSet, clear, containsKey, containsValue, copyFunctionsFrom, entrySet, getFunction, getLightWeightInstance, init, isEmpty, keySet, remove, size, threadSafeMapCopy, toString, values

Methods inherited from class java.lang.Object

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

Constructor Details

XFunctionTable

public XFunctionTable()

XFunctionTable

public XFunctionTable(FunctionTable root)

Decorator constructor, replaces instances of Random by DirtyRandom. and instances of ThreadSafeRandom by DirtyThreadSafeRandom. If neither is defined adds a rand() random function using DirtyRandom.

XFunctionTable

protected XFunctionTable(Map<String,PostfixMathCommandI> tbl)

Method Details

shallowCopy

public FunctionTable shallowCopy()

Description copied from class: FunctionTable

Returns a new shallow copy of this function table. Calls the FunctionTable.threadSafeMapCopy() method to ensure the table is safe to use a separate thread. All subclasses should override this method to create a function table of the matching type. A typical implementation would be

 @Override
 public FunctionTable shallowCopy() {
     Map<String,PostfixMathCommandI> newMap = this.threadSafeMapCopy();
     return new myFunctionTable(newMap);
 }
 

using the FunctionTable.threadSafeMapCopy() method to return a copy of the map of functions and a constructor taking this map which uses the FunctionTable(Map) constructor.

Overrides:

shallowCopy in class StandardFunctionTable

Returns:

a new shallow copy of this function table

addXFunctions

protected void addXFunctions()