civita::Slice Class Reference

corresponds to OLAP slice operation More...

#include <tensorOp.h>

Inheritance diagram for civita::Slice:

Collaboration diagram for civita::Slice:

Public Member Functions
void	setArgument (const TensorPtr &a, const ITensor::Args &) override
double	operator[] (std::size_t i) const override
	return or compute data at a location More...
Timestamp	timestamp () const override
	timestamp indicating how old the dependendent data might be. Used in CachedTensorOp to determine when to invalidate the cache More...
Public Member Functions inherited from civita::ITensor
	CLASSDESC_ACCESS (ITensor)
	ITensor ()
	ITensor (const Hypercube &hc)
	ITensor (Hypercube &&hc)
	ITensor (const std::vector< unsigned > &dims)
	ITensor (const ITensor &)=default
	ITensor (ITensor &&)=default
ITensor &	operator= (const ITensor &)=default
ITensor &	operator= (ITensor &&)=default
virtual	~ITensor ()
virtual const Hypercube &	hypercube () const
	information describing the axes, types and labels of this tensor More...
virtual const Hypercube &	hypercube (const Hypercube &hc)
virtual const Hypercube &	hypercube (Hypercube &&hc)
std::size_t	rank () const
std::vector< unsigned >	shape () const
void	imposeDimensions (const Dimensions &dimensions)
	impose dimensions according to dimension map dimensions More...
virtual const Index &	index () const
	the index vector - assumed to be ordered and unique More...
virtual std::size_t	size () const
	return number of elements in tensor - maybe less than hypercube.numElements if sparse More...
double	atHCIndex (std::size_t hcIdx) const
	returns the data value at hypercube index hcIdx, or NaN if More...
template<class T >
std::size_t	hcIndex (const std::initializer_list< T > &indices) const
template<class T >
double	operator() (const std::initializer_list< T > &indices) const
virtual void	setArguments (const TensorPtr &, const TensorPtr &, const ITensor::Args &args={})
virtual void	setArguments (const std::vector< TensorPtr > &a, const ITensor::Args &args={"", 0})
virtual void	setArguments (const std::vector< TensorPtr > &a1, const std::vector< TensorPtr > &a2, const ITensor::Args &args={"", 0})

Private Attributes
std::size_t	stride =1
std::size_t	split =1
std::size_t	sliceIndex =0
TensorPtr	arg
std::vector< std::size_t >	arg_index

Additional Inherited Members
Public Types inherited from civita::ITensor
using	Timestamp = std::chrono::time_point< std::chrono::high_resolution_clock >
Protected Member Functions inherited from civita::ITensor
void	notImpl () const
Protected Attributes inherited from civita::ITensor
Hypercube	m_hypercube
Index	m_index

Detailed Description

corresponds to OLAP slice operation

Definition at line 225 of file tensorOp.h.

Member Function Documentation

operator[]()

double civita::Slice::operator[] ( std::size_t  ) const

overridevirtual

return or compute data at a location

Implements civita::ITensor.

Definition at line 298 of file tensorOp.cc.

  {
    assert(i<size());
    if (m_index.empty())
      {
        auto res=div(ssize_t(i), ssize_t(split));
        return arg->atHCIndex(res.quot*stride + sliceIndex*split + res.rem);
      }
    return (*arg)[arg_index[i]];
  }

setArgument()

void civita::Slice::setArgument ( const TensorPtr &  a, const ITensor::Args &  args  )

overridevirtual

Reimplemented from civita::ITensor.

Definition at line 244 of file tensorOp.cc.

References civita::ITensor::Args::dimension, and civita::ITensor::Args::val.

  {
    arg=a;
    sliceIndex=args.val;
    if (arg)
      {
        auto& xv=arg->hypercube().xvectors;
        Hypercube hc;
        // find axis where slicing along
        split=1;
        size_t splitAxis=0;
        auto i=xv.begin();
        for (; i!=xv.end(); ++i)
          if (i->name==args.dimension)
            {
              stride=split*i->size();
              break;
            }
          else
            {
              hc.xvectors.push_back(*i);
              split*=i->size();
              splitAxis++;
            }

        if (i==xv.end())
          split=stride=1;
        else
          for (i++; i!=xv.end(); ++i)
            // finish building hypercube
            hc.xvectors.push_back(*i);
        hypercube(hc);

        // set up index vector
        auto& ahc=arg->hypercube();
        map<size_t, size_t> ai;
        for (size_t i=0; i<arg->index().size(); ++i)
          {
            auto splitIdx=ahc.splitIndex(arg->index()[i]);
            if (splitIdx[splitAxis]==sliceIndex)
              {
                splitIdx.erase(splitIdx.begin()+splitAxis);
                auto l=hc.linealIndex(splitIdx);
                ai[l]=i;
              }
          }
        m_index=ai;
        arg_index.resize(ai.size());
        // convert into lineal addressing
        size_t j=0;
        for (auto& i: ai) arg_index[j++]=i.second;
      }
  }

timestamp()

Timestamp civita::Slice::timestamp ( ) const

inlineoverridevirtual

timestamp indicating how old the dependendent data might be. Used in CachedTensorOp to determine when to invalidate the cache

Implements civita::ITensor.

Definition at line 233 of file tensorOp.h.

References arg.

{return arg->timestamp();}

Member Data Documentation

arg

TensorPtr civita::Slice::arg

private

Definition at line 228 of file tensorOp.h.

Referenced by timestamp().

arg_index

std::vector<std::size_t> civita::Slice::arg_index

private

Definition at line 229 of file tensorOp.h.

sliceIndex

std::size_t civita::Slice::sliceIndex =0

private

Definition at line 227 of file tensorOp.h.

split

std::size_t civita::Slice::split =1

private

Definition at line 227 of file tensorOp.h.

stride

std::size_t civita::Slice::stride =1

private

Definition at line 227 of file tensorOp.h.

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The documentation for this class was generated from the following files:

• tensor/tensorOp.h
• tensor/tensorOp.cc