RWRange Class Reference

Represents an index that can be used for subscripting vectors, matrices, and arrays. More...

#include <rw/rwslice.h>

Inheritance diagram for RWRange:

Public Member Functions
	RWRange (int begin, int end)
	RWRange (int begin, int end, int stride)
Public Member Functions inherited from RWSlice
	RWSlice (const char *s)
	RWSlice (int begin, int length)
	RWSlice (int begin, int length, int stride)

Additional Inherited Members
Related Symbols inherited from RWSlice
const RWSlice &	RWAll

Detailed Description

An RWRange object is an index which can be used for subscripting vectors, matrices, and arrays. By subscripting with RWRange objects, you create views of selected elements. These new views are vectors, matrices, or arrays in their own right, rather than simply helper classes. This means that a view created with subscripting can be used as an rvalue, an lvalue, or kept as an object for use later.

The class RWRange is derived from RWSlice. It can be used to initialize an RWSlice object as follows:

RWSlice s = RWRange(b, e);

Synopsis

#include <rw/math/mathvec.h>
RWMathVec<double> x(20, 2);
cout << x(RWRange(3, 5));  // print elements 3,4,5

Example

#include <rw/math/genmat.h>
#include <iostream.h>
 
int main() {
  RWGenMat<int> A(6, 6);
  RWRange I(0, 2);
  RWRange J(3, 5);
  A(I, I) = 1;
  A(I, J) = 2;
  A(J, I) = 3;
  A(J, J) = 4;
  cout << A << endl;
}

Program output:

6x6
[
     1     1     1     2     2     2
     1     1     1     2     2     2
     1     1     1     2     2     2
     3     3     3     4     4     4
     3     3     3     4     4     4
     3     3     3     4     4     4
]

See also

RWSlice, RWToEnd, RWMathVec::operator()(), RWGenMat::operator()(), RWMathArray::operator()()

Constructor & Destructor Documentation

RWRange() [1/2]

RWRange::RWRange ( int begin, int end )

inline

Constructs an object which indexes starting at element begin and ending with element end. If end is smaller than begin, the elements are accessed in reverse order.

RWRange() [2/2]

RWRange::RWRange ( int begin, int end, int stride )

inline

Constructs an object which indexes starting at element begin and ending with element end. If end is smaller than begin, the elements are accessed in reverse order. The parameter stride gives the increment between selected elements; it must always be greater than 0.