/// <summary>
/// Applies the inverse Fast Fourier Transform (iFFT) to a two dimensional data in form of a matrix.
/// </summary>
/// <param name="spectrum">Sample matrix, where the iFFT is evaluated in place</param>
/// <param name="options">Fourier Transform Convention Options.</param>
public static void Inverse2D(Matrix <Complex> spectrum, FourierOptions options = FourierOptions.Default)
{
var rowMajorArray = spectrum.AsRowMajorArray();
if (rowMajorArray != null)
{
InverseMultiDim(rowMajorArray, new[] { spectrum.RowCount, spectrum.ColumnCount }, options);
return;
}
var columnMajorArray = spectrum.AsColumnMajorArray();
if (columnMajorArray != null)
{
InverseMultiDim(columnMajorArray, new[] { spectrum.ColumnCount, spectrum.RowCount }, options);
return;
}
// Fall Back
columnMajorArray = spectrum.ToColumnMajorArray();
InverseMultiDim(columnMajorArray, new[] { spectrum.ColumnCount, spectrum.RowCount }, options);
var denseStorage = new DenseColumnMajorMatrixStorage <Complex>(spectrum.RowCount, spectrum.ColumnCount, columnMajorArray);
denseStorage.CopyToUnchecked(spectrum.Storage, ExistingData.Clear);
}
/// <summary>
/// Applies the forward Fast Fourier Transform (FFT) to a two dimensional data in form of a matrix.
/// </summary>
/// <param name="samples">Sample matrix, where the FFT is evaluated in place</param>
/// <param name="options">Fourier Transform Convention Options.</param>
public static void Forward2D(Matrix <Complex> samples, FourierOptions options = FourierOptions.Default)
{
var rowMajorArray = samples.AsRowMajorArray();
if (rowMajorArray != null)
{
ForwardMultiDim(rowMajorArray, new[] { samples.RowCount, samples.ColumnCount }, options);
return;
}
var columnMajorArray = samples.AsColumnMajorArray();
if (columnMajorArray != null)
{
ForwardMultiDim(columnMajorArray, new[] { samples.ColumnCount, samples.RowCount }, options);
return;
}
// Fall Back
columnMajorArray = samples.ToColumnMajorArray();
ForwardMultiDim(columnMajorArray, new[] { samples.ColumnCount, samples.RowCount }, options);
var denseStorage = new DenseColumnMajorMatrixStorage <Complex>(samples.RowCount, samples.ColumnCount, columnMajorArray);
denseStorage.CopyToUnchecked(samples.Storage, ExistingData.Clear);
}
/// <summary>
/// Applies the inverse Fast Fourier Transform (iFFT) to a two dimensional data in form of a matrix.
/// </summary>
/// <param name="spectrum">Sample matrix, where the iFFT is evaluated in place</param>
/// <param name="options">Fourier Transform Convention Options.</param>
public static void Inverse2D(Matrix <Complex> spectrum, FourierOptions options = FourierOptions.Default)
{
// since dense matrix data is column major, we switch rows and columns
var denseStorage = spectrum.Storage as DenseColumnMajorMatrixStorage <Complex>;
if (denseStorage == null)
{
var samplesColumnMajor = spectrum.ToColumnWiseArray();
InverseMultiDim(samplesColumnMajor, new[] { spectrum.ColumnCount, spectrum.RowCount }, options);
denseStorage = new DenseColumnMajorMatrixStorage <Complex>(spectrum.RowCount, spectrum.ColumnCount, samplesColumnMajor);
denseStorage.CopyToUnchecked(spectrum.Storage, ExistingData.Clear);
return;
}
InverseMultiDim(denseStorage.Data, new[] { spectrum.ColumnCount, spectrum.RowCount }, options);
}
/// <summary>
/// Applies the inverse Fast Fourier Transform (iFFT) to a two dimensional data in form of a matrix.
/// </summary>
/// <param name="spectrum">Sample matrix, where the iFFT is evaluated in place</param>
/// <param name="options">Fourier Transform Convention Options.</param>
public static void Inverse2D(Matrix<Complex> spectrum, FourierOptions options = FourierOptions.Default)
{
// since dense matrix data is column major, we switch rows and columns
var denseStorage = spectrum.Storage as DenseColumnMajorMatrixStorage<Complex>;
if (denseStorage == null)
{
var samplesColumnMajor = spectrum.ToColumnWiseArray();
InverseMultiDim(samplesColumnMajor, new[] { spectrum.ColumnCount, spectrum.RowCount }, options);
denseStorage = new DenseColumnMajorMatrixStorage<Complex>(spectrum.RowCount, spectrum.ColumnCount, samplesColumnMajor);
denseStorage.CopyToUnchecked(spectrum.Storage, ExistingData.Clear);
return;
}
InverseMultiDim(denseStorage.Data, new[] { spectrum.ColumnCount, spectrum.RowCount }, options);
}
