codac2_Matrix_addons_MatrixBase.h File Reference

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Functions
template<int R = RowsAtCompileTime, int C = ColsAtCompileTime>
	Matrix ()=delete
	Deleted default constructor to prevent default instantiation when either the number of rows or columns is dynamic.
template<int R = RowsAtCompileTime, int C = ColsAtCompileTime>
	Matrix (int r, int c)
	Constructs a matrix with given number of rows and columns.
template<int R = RowsAtCompileTime, int C = ColsAtCompileTime>
	Matrix (int r, int c, const Scalar values[])
	Constructs a non-vector matrix with given dimensions and initializes it from a raw array of values.
template<int R = RowsAtCompileTime, int C = ColsAtCompileTime>
void	resize_save_values (Index r, Index c)
	Resizes the matrix to (r,c), preserving existing values where possible.

Detailed Description

This file is included in the declaration of Eigen::MatrixBase, thanks to the preprocessor token EIGEN_MATRIX_PLUGIN. See: https://eigen.tuxfamily.org/dox/TopicCustomizing_Plugins.html and the file codac2_matrices.h

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Date

2024

Author

Simon Rohou

Copyright

Copyright 2023 Codac Team

License: GNU Lesser General Public License (LGPL)

Function Documentation

Matrix() [1/2]

template<int R = RowsAtCompileTime, int C = ColsAtCompileTime>

Matrix ( int r, int c )

explicit

Constructs a matrix with given number of rows and columns.

Initializes the matrix storage with dimensions (r,c). If Scalar is not an interval domain, the matrix is initialized with zeros.

Parameters

r	Number of rows (runtime).
c	Number of columns (runtime).

{
  Base::template _init2<int,int>(r,c);
  if constexpr(!IsIntervalDomain<Scalar>)
    init(0.);
}

Matrix() [2/2]

template<int R = RowsAtCompileTime, int C = ColsAtCompileTime>

Matrix ( int r, int c, const Scalar values[] )

explicit

Constructs a non-vector matrix with given dimensions and initializes it from a raw array of values.

Copies the values from the values array into the matrix elements. If values is null, initializes all elements to zero.

Parameters

r	Number of rows (runtime).
c	Number of columns (runtime).
values	Pointer to array of values used to initialize matrix elements. Can be null, in which case the matrix is zero-initialized.

Precondition

The runtime dimensions r and c must match the compile-time dimensions R and C if these are fixed (not -1).

r and c must be non-negative.

  : Matrix<Scalar,R,C>(r,c)
{
  assert((R==(int)r || R==-1) && (C==(int)c || C==-1));
  assert(r >= 0 && c >= 0);
 
  if(values == 0)
    init(Scalar(0.)); // in case the user called Matrix(r,c,0) and 0 is interpreted as NULL!
 
  else
  {
    Index k = 0;
    for(Index i = 0 ; i < this->rows() ; i++)
      for(Index j = 0 ; j < this->cols() ; j++)
        (*this)(i,j) = values[k++];
    assert(k == this->size());
  }
}

resize_save_values()

template<int R = RowsAtCompileTime, int C = ColsAtCompileTime>

void resize_save_values ( Index r, Index c )

inline

Resizes the matrix to (r,c), preserving existing values where possible.

Parameters

r	New number of rows.
c	New number of columns.

This function resizes the matrix while preserving the data in the overlapping region of the old and new sizes. Unlike Eigen's resize(), which discards old data, this function copies existing values into the resized matrix.

{
  // With resize() of Eigen, the data is reallocated and all previous values are lost.
  auto copy = *this;
  this->resize(r,c);
  for(Index i = 0 ; i < std::min((Index)copy.rows(),r) ; i++)
    for(Index j = 0 ; j < std::min((Index)copy.cols(),c) ; j++)
      (*this)(i,j) = copy(i,j);
}