mirror/eigen
2
0
Fork 0
mirror of https://gitlab.com/libeigen/eigen.git synced 2025-03-31 19:00:35 +08:00
Code Issues Packages Projects Releases Wiki Activity

re-optimize Matrix::resize(), add some comments

Browse Source
This commit is contained in:
Benoit Jacob 2008-01-14 13:14:49 +00:00
parent e20aceb6eb
commit 2ee7969f0a
1 changed files with 14 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
Eigen/src/Core/Matrix.h
View File

@ -116,6 +116,7 @@ class Matrix : public MatrixBase<_Scalar, Matrix<_Scalar, _Rows, _Cols,
enum {
RowsAtCompileTime = _Rows,
ColsAtCompileTime = _Cols,
SizeAtCompileTime = _Rows == Dynamic || _Cols == Dynamic ? Dynamic : _Rows * _Cols,
StorageOrder = _StorageOrder,
MaxRowsAtCompileTime = _MaxRows,
MaxColsAtCompileTime = _MaxCols,
@ -149,6 +150,8 @@ class Matrix : public MatrixBase<_Scalar, Matrix<_Scalar, _Rows, _Cols,
}
public:
/** This type can be used to declare any matrix with smaller dimensions.
*/
typedef Matrix<
Scalar,
RowsAtCompileTime == 1 ? 1 : Dynamic,
@ -157,8 +160,11 @@ class Matrix : public MatrixBase<_Scalar, Matrix<_Scalar, _Rows, _Cols,
RowsAtCompileTime == 1 ? 1 : MaxRowsAtCompileTime,
ColsAtCompileTime == 1 ? 1 : MaxColsAtCompileTime
> BlockType;
/** This type can be used to declare a column-vector */
typedef Matrix<Scalar, RowsAtCompileTime, 1,
StorageOrder, MaxRowsAtCompileTime, 1> ColumnType;
/** This type can be used to declare a row-vector */
typedef Matrix<Scalar, 1, ColsAtCompileTime,
StorageOrder, 1, MaxColsAtCompileTime> RowType;
@ -178,9 +184,14 @@ class Matrix : public MatrixBase<_Scalar, Matrix<_Scalar, _Rows, _Cols,
&& cols > 0
&& (MaxColsAtCompileTime == Dynamic || MaxColsAtCompileTime >= cols)
&& (ColsAtCompileTime == Dynamic || ColsAtCompileTime == cols));
m_rows.setValue(rows);
m_cols.setValue(cols);
m_array.resize(rows * cols);
if(SizeAtCompileTime == Dynamic)
{
const int size = rows * cols;
if(size > m_rows.value() * m_cols.value())
m_array.resize(size);
m_rows.setValue(rows);
m_cols.setValue(cols);
}
}
/** Copies the value of the expression \a other into *this.