ifft2

Functions

int main(int argc, char *argv[])

ifft2 [ option ] [ infile ]

  • -l int

    • FFT length \((1 \le L)\)

  • -q int

    • input format

      • 0 real and imaginary parts

      • 1 real part

      • 2 imaginary part

  • -o int

    • output format

      • 0 real and imaginary parts

      • 1 real part

      • 2 imaginary part

  • -p int

    • output style

      • 0 standard

      • 1 transposed

      • 2 transposed with boundary

      • 3 quadrand with boundary

  • infile str

    • double-type 2D data sequence

  • stdout

    • double-type 2D inverse FFT sequence

Parameters:

  • argc – [in] Number of arguments.

  • argv – [in] Argument vector.

Returns:

0 on success, 1 on failure.

See also

ifft fft2 fftr2

class TwoDimensionalInverseFastFourierTransform

Calculate 2D inverse DFT of complex-valued input data.

The inputs are two \(M \times N\) matrices that represent real and imaginary parts:

\[ \begin{array}{cc} \mathrm{Re}(\boldsymbol{X}), & \mathrm{Im}(\boldsymbol{X}). \end{array} \]
The outputs are two \(L \times L \) matrices:
\[ \begin{array}{cccc} \mathrm{Re}(\boldsymbol{x}), & \mathrm{Im}(\boldsymbol{x}), \end{array} \]
where \(L\) is the FFT length and must be a power of two.

Public Functions

TwoDimensionalInverseFastFourierTransform(int num_row, int num_column, int fft_length)
Parameters:

  • num_row – [in] Number of rows, \(M\).

  • num_column – [in] Number of columns \(N\).

  • fft_length – [in] FFT length, \(L\).

inline int GetNumRow() const
Returns:

Number of rows of input.

inline int GetNumColumn() const
Returns:

Number of columns of input.

inline int GetFftLength() const
Returns:

FFT length.

inline bool IsValid() const
Returns:

True if this object is valid.

bool Run(const Matrix &real_part_input, const Matrix &imag_part_input, Matrix *real_part_output, Matrix *imag_part_output, TwoDimensionalInverseFastFourierTransform::Buffer *buffer) const
Parameters:

  • real_part_input – [in] Real part of input.

  • imag_part_input – [in] Imaginary part of input.

  • real_part_output – [out] Real part of output.

  • imag_part_output – [out] Imaginary part of output.

  • buffer – [out] Buffer.

Returns:

True on success, false on failure.

bool Run(Matrix *real_part, Matrix *imag_part, TwoDimensionalInverseFastFourierTransform::Buffer *buffer) const
Parameters:

  • real_part – [inout] Real part.

  • imag_part – [inout] Imaginary part.

  • buffer – [out] Buffer.

Returns:

True on success, false on failure.

class Buffer

Buffer for TwoDimensionalInverseFastFourierTransform class.