This LEL class handles numerical (real only) 1-argument functions. More...

#include <LELFunction.h>

Inheritance diagram for casa::LELFunctionReal1D< T >:

Public Member Functions
	LELFunctionReal1D (const LELFunctionEnums::Function function, const CountedPtr< LELInterface< T > > &expr)
	Constructor takes operation and expression to be operated upon.
	~LELFunctionReal1D ()
	Destructor.
virtual void	eval (LELArray< T > &result, const Slicer &section) const
	Recursively evaluate the expression.
virtual LELScalar< T >	getScalar () const
	Recursively evaluate the scalar expression.
virtual Bool	prepareScalarExpr ()
	Do further preparations (e.g.
virtual String	className () const
	Get class name.
virtual Bool	lock (FileLocker::LockType, uInt nattempts)
	Handle locking/syncing of a lattice in a lattice expression.
virtual void	unlock ()
virtual Bool	hasLock (FileLocker::LockType) const
virtual void	resync ()
Private Attributes
LELFunctionEnums::Function	function_p

CountedPtr< LELInterface< T > >	pExpr_p

Detailed Description

template<class T>
class casa::LELFunctionReal1D< T >

This LEL class handles numerical (real only) 1-argument functions.

Intended use:

Internal

Review Status

Date Reviewed:: yyyy/mm/dd

Prerequisite

Etymology

This derived LEL letter class handles numerical (real only) 1-argument functions

Synopsis

This LEL letter class is derived from LELInterface. It is used to construct LEL objects that apply numerical (real only) 1-argument functions to Lattice expressions. They operate on Float and Double numerical Lattice expressions and return the same type. The available C++ functions are asin,acos,tan,tanh,ceil,floor with equivalents in the enum of ASIN, ACOS, TAN, TANH, CEIL, and FLOOR.

A description of the implementation details of the LEL classes can be found in Note 216

Example

Examples are not very useful as the user would never use these classes directly. Look in LatticeExprNode.cc to see how it invokes these classes. Examples of how the user would indirectly use this class (through the envelope) are:

    IPosition shape(2,5,10);
    ArrayLattice<Float> x(shape); x.set(0.05);
    ArrayLattice<Float> y(shape); 
    y.copyData(asin(x));                 // y = asin(x)
    y.copyData(tan(x));                  // y = tan(x)

Note that the min function returns a scalar, and the output Lattice is filled with that one value.