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SubSVec.h

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/*
    File:           SubSVec.h

    Function:       Defines a scatter-gather sparse vector, i.e., a subvector
                    of another vector or the row, column or diagonal of a
                    sparse matrix.
                    
    Author(s):      Andrew Willmott

    Copyright:      (c) 1995-2000, Andrew Willmott
 */

#ifndef __SubSVec__
#define __SubSVec__

#include "vl/Vec.h"


class TSparseVec;

class TSubSVec
{
public:
                    TSubSVec(Int start, Int length, TSparseVec *target,
                             Int span = 1);
                    TSubSVec(const TSubSVec &v);
    
    inline Int      Elts() const { return(elts); };

    TSubSVec        &operator = (const TSubSVec &v);
    TSubSVec        &operator = (const TSparseVec &v);
    Void            Store(TSparseVec &sv) const;

protected: 
    
    Int             elts;       // # of elements
    Int             start;      // start element in the target vector
    Int             colSpan;    // columns between elements
    Int             rowSpan;    // rows between elements
    TSparseVec      *target;    // the sparse vector this is a subvector of
};

// --- Sub-vector operator ----------------------------------------------------
    
TSubSVec    sub(const TSparseVec &v, Int start, Int length); 

#endif

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