Documentation of 'cern.colt.matrix.tfloat.impl.DenseLargeFloatMatrix2D' Java class
DenseLargeFloatMatrix2D
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cern.colt.matrix.tfloat.impl

Class DenseLargeFloatMatrix2D

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Cloneable

    public class DenseLargeFloatMatrix2D
extends WrapperFloatMatrix2D
    Dense 2-d matrix holding float elements. First see the package summary and javadoc tree view to get the broad picture.

    Implementation:

    This data structure allows to store more than 2^31 elements. Internally holds one two-dimensional array, elements[rows][columns]. Note that this implementation is not synchronized.

    Time complexity:

    O(1) (i.e. constant time) for the basic operations get, getQuick, set, setQuick and size.

    See Also:
    Serialized Form

    • Constructor Detail

      • DenseLargeFloatMatrix2D

        public DenseLargeFloatMatrix2D(int rows,
                               int columns)

    • Method Detail

      • dct2

        public void dct2(boolean scale)
        Computes the 2D discrete cosine transform (DCT-II) of this matrix.
        Overrides:
        dct2 in class WrapperFloatMatrix2D
        Parameters:
        scale - if true then scaling is performed

      • dctColumns

        public void dctColumns(boolean scale)
        Computes the discrete cosine transform (DCT-II) of each column of this matrix.
        Overrides:
        dctColumns in class WrapperFloatMatrix2D
        Parameters:
        scale - if true then scaling is performed

      • dctRows

        public void dctRows(boolean scale)
        Computes the discrete cosine transform (DCT-II) of each row of this matrix.
        Overrides:
        dctRows in class WrapperFloatMatrix2D
        Parameters:
        scale - if true then scaling is performed

      • dht2

        public void dht2()
        Computes the 2D discrete Hartley transform (DHT) of this matrix.
        Overrides:
        dht2 in class WrapperFloatMatrix2D

      • dhtColumns

        public void dhtColumns()
        Computes the discrete Hartley transform (DHT) of each column of this matrix.
        Overrides:
        dhtColumns in class WrapperFloatMatrix2D

      • dhtRows

        public void dhtRows()
        Computes the discrete Hartley transform (DHT) of each row of this matrix.
        Overrides:
        dhtRows in class WrapperFloatMatrix2D

      • dst2

        public void dst2(boolean scale)
        Computes the 2D discrete sine transform (DST-II) of this matrix.
        Overrides:
        dst2 in class WrapperFloatMatrix2D
        Parameters:
        scale - if true then scaling is performed

      • dstColumns

        public void dstColumns(boolean scale)
        Computes the discrete sine transform (DST-II) of each column of this matrix.
        Overrides:
        dstColumns in class WrapperFloatMatrix2D
        Parameters:
        scale - if true then scaling is performed

      • dstRows

        public void dstRows(boolean scale)
        Computes the discrete sine transform (DST-II) of each row of this matrix.
        Overrides:
        dstRows in class WrapperFloatMatrix2D
        Parameters:
        scale - if true then scaling is performed

      • fft2

        public void fft2()
        Computes the 2D discrete Fourier transform (DFT) of this matrix. The physical layout of the output data is as follows: 
         this[k1][2*k2] = Re[k1][k2] = Re[rows-k1][columns-k2], 
 this[k1][2*k2+1] = Im[k1][k2] = -Im[rows-k1][columns-k2], 
       0<k1<rows, 0<k2<columns/2, 
 this[0][2*k2] = Re[0][k2] = Re[0][columns-k2], 
 this[0][2*k2+1] = Im[0][k2] = -Im[0][columns-k2], 
       0<k2<columns/2, 
 this[k1][0] = Re[k1][0] = Re[rows-k1][0], 
 this[k1][1] = Im[k1][0] = -Im[rows-k1][0], 
 this[rows-k1][1] = Re[k1][columns/2] = Re[rows-k1][columns/2], 
 this[rows-k1][0] = -Im[k1][columns/2] = Im[rows-k1][columns/2], 
       0<k1<rows/2, 
 this[0][0] = Re[0][0], 
 this[0][1] = Re[0][columns/2], 
 this[rows/2][0] = Re[rows/2][0], 
 this[rows/2][1] = Re[rows/2][columns/2]
        This method computes only half of the elements of the real transform. The other half satisfies the symmetry condition. If you want the full real forward transform, use getFft2. To get back the original data, use ifft2.
        Overrides:
        fft2 in class WrapperFloatMatrix2D
        Throws:
        java.lang.IllegalArgumentException - if the row size or the column size of this matrix is not a power of 2 number.

      • getFftColumns

        public DenseLargeFComplexMatrix2D getFftColumns()
        Returns new complex matrix which is the discrete Fourier transform (DFT) of each column of this matrix.
        Overrides:
        getFftColumns in class WrapperFloatMatrix2D
        Returns:
        the discrete Fourier transform (DFT) of each column of this matrix.

      • getFftRows

        public DenseLargeFComplexMatrix2D getFftRows()
        Returns new complex matrix which is the discrete Fourier transform (DFT) of each row of this matrix.
        Overrides:
        getFftRows in class WrapperFloatMatrix2D
        Returns:
        the discrete Fourier transform (DFT) of each row of this matrix.

      • getIfft2

        public DenseLargeFComplexMatrix2D getIfft2(boolean scale)
        Returns new complex matrix which is the 2D inverse of the discrete Fourier transform (IDFT) of this matrix.
        Overrides:
        getIfft2 in class WrapperFloatMatrix2D
        Returns:
        the 2D inverse of the discrete Fourier transform (IDFT) of this matrix.

      • getIfftColumns

        public DenseLargeFComplexMatrix2D getIfftColumns(boolean scale)
        Returns new complex matrix which is the inverse of the discrete Fourier transform (IDFT) of each column of this matrix.
        Overrides:
        getIfftColumns in class WrapperFloatMatrix2D
        Returns:
        the inverse of the discrete Fourier transform (IDFT) of each column of this matrix.

      • getIfftRows

        public DenseLargeFComplexMatrix2D getIfftRows(boolean scale)
        Returns new complex matrix which is the inverse of the discrete Fourier transform (IDFT) of each row of this matrix.
        Overrides:
        getIfftRows in class WrapperFloatMatrix2D
        Returns:
        the inverse of the discrete Fourier transform (IDFT) of each row of this matrix.

      • getQuick

        public float getQuick(int row,
                      int column)
        Description copied from class: FloatMatrix2D
        Returns the matrix cell value at coordinate [row,column].

        Provided with invalid parameters this method may return invalid objects without throwing any exception. You should only use this method when you are absolutely sure that the coordinate is within bounds. Precondition (unchecked): 0 <= column < columns() && 0 <= row < rows().

        Overrides:
        getQuick in class WrapperFloatMatrix2D
        Parameters:
        row - the index of the row-coordinate.
        column - the index of the column-coordinate.
        Returns:
        the value at the specified coordinate.

      • idct2

        public void idct2(boolean scale)
        Computes the 2D inverse of the discrete cosine transform (DCT-III) of this matrix.
        Overrides:
        idct2 in class WrapperFloatMatrix2D
        Parameters:
        scale - if true then scaling is performed

      • idctColumns

        public void idctColumns(boolean scale)
        Computes the inverse of the discrete cosine transform (DCT-III) of each column of this matrix.
        Overrides:
        idctColumns in class WrapperFloatMatrix2D
        Parameters:
        scale - if true then scaling is performed

      • idctRows

        public void idctRows(boolean scale)
        Computes the inverse of the discrete cosine transform (DCT-III) of each row of this matrix.
        Overrides:
        idctRows in class WrapperFloatMatrix2D
        Parameters:
        scale - if true then scaling is performed

      • idht2

        public void idht2(boolean scale)
        Computes the 2D inverse of the discrete Hartley transform (IDHT) of this matrix.
        Overrides:
        idht2 in class WrapperFloatMatrix2D
        Parameters:
        scale - if true then scaling is performed

      • idhtColumns

        public void idhtColumns(boolean scale)
        Computes the inverse of the discrete Hartley transform (IDHT) of each column of this matrix.
        Overrides:
        idhtColumns in class WrapperFloatMatrix2D
        Parameters:
        scale - if true then scaling is performed

      • idhtRows

        public void idhtRows(boolean scale)
        Computes the inverse of the discrete Hartley transform (IDHT) of each row of this matrix.
        Overrides:
        idhtRows in class WrapperFloatMatrix2D
        Parameters:
        scale - if true then scaling is performed

      • idst2

        public void idst2(boolean scale)
        Computes the 2D inverse of the discrete sine transform (DST-III) of this matrix.
        Overrides:
        idst2 in class WrapperFloatMatrix2D
        Parameters:
        scale - if true then scaling is performed

      • idstColumns

        public void idstColumns(boolean scale)
        Computes the inverse of the discrete sine transform (DST-III) of each column of this matrix.
        Overrides:
        idstColumns in class WrapperFloatMatrix2D
        Parameters:
        scale - if true then scaling is performed

      • idstRows

        public void idstRows(boolean scale)
        Computes the inverse of the discrete sine transform (DST-III) of each row of this matrix.
        Overrides:
        idstRows in class WrapperFloatMatrix2D
        Parameters:
        scale - if true then scaling is performed

      • ifft2

        public void ifft2(boolean scale)
        Computes the 2D inverse of the discrete Fourier transform (IDFT) of this matrix. The physical layout of the input data has to be as follows: 
         this[k1][2*k2] = Re[k1][k2] = Re[rows-k1][columns-k2], 
 this[k1][2*k2+1] = Im[k1][k2] = -Im[rows-k1][columns-k2], 
       0<k1<rows, 0<k2<columns/2, 
 this[0][2*k2] = Re[0][k2] = Re[0][columns-k2], 
 this[0][2*k2+1] = Im[0][k2] = -Im[0][columns-k2], 
       0<k2<columns/2, 
 this[k1][0] = Re[k1][0] = Re[rows-k1][0], 
 this[k1][1] = Im[k1][0] = -Im[rows-k1][0], 
 this[rows-k1][1] = Re[k1][columns/2] = Re[rows-k1][columns/2], 
 this[rows-k1][0] = -Im[k1][columns/2] = Im[rows-k1][columns/2], 
       0<k1<rows/2, 
 this[0][0] = Re[0][0], 
 this[0][1] = Re[0][columns/2], 
 this[rows/2][0] = Re[rows/2][0], 
 this[rows/2][1] = Re[rows/2][columns/2]
        This method computes only half of the elements of the real transform. The other half satisfies the symmetry condition. If you want the full real inverse transform, use getIfft2.
        Overrides:
        ifft2 in class WrapperFloatMatrix2D
        Parameters:
        scale - if true then scaling is performed
        Throws:
        java.lang.IllegalArgumentException - if the row size or the column size of this matrix is not a power of 2 number.

      • setQuick

        public void setQuick(int row,
                     int column,
                     float value)
        Description copied from class: FloatMatrix2D
        Sets the matrix cell at coordinate [row,column] to the specified value.

        Provided with invalid parameters this method may access illegal indexes without throwing any exception. You should only use this method when you are absolutely sure that the coordinate is within bounds. Precondition (unchecked): 0 <= column < columns() && 0 <= row < rows().

        Overrides:
        setQuick in class WrapperFloatMatrix2D
        Parameters:
        row - the index of the row-coordinate.
        column - the index of the column-coordinate.
        value - the value to be filled into the specified cell.

      • like

        public FloatMatrix2D like(int rows,
                          int columns)
        Description copied from class: FloatMatrix2D
        Construct and returns a new empty matrix of the same dynamic type as the receiver, having the specified number of rows and columns. For example, if the receiver is an instance of type DenseFloatMatrix2D the new matrix must also be of type DenseFloatMatrix2D, if the receiver is an instance of type SparseFloatMatrix2D the new matrix must also be of type SparseFloatMatrix2D, etc. In general, the new matrix should have internal parametrization as similar as possible.
        Overrides:
        like in class WrapperFloatMatrix2D
        Parameters:
        rows - the number of rows the matrix shall have.
        columns - the number of columns the matrix shall have.
        Returns:
        a new empty matrix of the same dynamic type.

      • like1D

        public FloatMatrix1D like1D(int size)
        Description copied from class: FloatMatrix2D
        Construct and returns a new 1-d matrix of the corresponding dynamic type, entirelly independent of the receiver. For example, if the receiver is an instance of type DenseFloatMatrix2D the new matrix must be of type DenseFloatMatrix1D, if the receiver is an instance of type SparseFloatMatrix2D the new matrix must be of type SparseFloatMatrix1D, etc.
        Overrides:
        like1D in class WrapperFloatMatrix2D
        Parameters:
        size - the number of cells the matrix shall have.
        Returns:
        a new matrix of the corresponding dynamic type.
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