Struct chfft::CFft2D
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pub struct CFft2D<T> { /* fields omitted */ }
Perform a complex-to-complex two-dimensional Fourier transform
Example
extern crate chfft; extern crate num_complex; use num_complex::Complex; use chfft::CFft2D; fn main() { let input = [ vec![ Complex::new(2.0, 0.0), Complex::new(1.0, 1.0), Complex::new(0.0, 3.0), Complex::new(2.0, 4.0), ], vec![ Complex::new(5.0, 0.0), Complex::new(3.0, 1.0), Complex::new(2.0, 3.0), Complex::new(2.0, 8.0), ], vec![ Complex::new(2.0, 5.0), Complex::new(2.0, 3.0), Complex::new(3.0, 7.0), Complex::new(2.0, 1.0), ], vec![ Complex::new(5.0, 4.0), Complex::new(1.0, 2.0), Complex::new(4.0, 3.0), Complex::new(2.0, 1.0), ], ]; let mut fft = CFft2D::<f64>::with_len(input.len(), input[0].len()); let output = fft.forward(&input); println!("the transform of {:?} is {:?}", input, output); }
Methods
impl<T: Float + FloatConst + NumAssign> CFft2D<T>
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fn new() -> Self
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Returns a instances to execute FFT
use chfft::CFft2D; let mut fft = CFft2D::<f64>::new();
fn with_len(len_m: usize, len_n: usize) -> Self
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Returns a instances to execute length initialized FFT
use chfft::CFft2D; let mut fft = CFft2D::<f64>::with_len(1024, 1024);
fn setup(&mut self, len_m: usize, len_n: usize)
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Reinitialize length
use chfft::CFft2D; let mut fft = CFft2D::<f64>::with_len(1024, 1024); // reinitialize fft.setup(2048, 2048);
fn forward(&mut self, source: &[Vec<Complex<T>>]) -> Vec<Vec<Complex<T>>>
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The 1 scaling factor forward transform
extern crate chfft; extern crate num_complex; let input = [ vec![ num_complex::Complex::new(2.0, 0.0), num_complex::Complex::new(1.0, 1.0), num_complex::Complex::new(0.0, 3.0), num_complex::Complex::new(2.0, 4.0), ], vec![ num_complex::Complex::new(5.0, 0.0), num_complex::Complex::new(3.0, 1.0), num_complex::Complex::new(2.0, 3.0), num_complex::Complex::new(2.0, 8.0), ], ]; let mut fft = chfft::CFft2D::<f64>::with_len(input.len(), input[0].len()); let output = fft.forward(&input);
fn forward0(&mut self, source: &[Vec<Complex<T>>]) -> Vec<Vec<Complex<T>>>
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The 1 scaling factor forward transform
extern crate chfft; extern crate num_complex; let input = [ vec![ num_complex::Complex::new(2.0, 0.0), num_complex::Complex::new(1.0, 1.0), num_complex::Complex::new(0.0, 3.0), num_complex::Complex::new(2.0, 4.0), ], vec![ num_complex::Complex::new(5.0, 0.0), num_complex::Complex::new(3.0, 1.0), num_complex::Complex::new(2.0, 3.0), num_complex::Complex::new(2.0, 8.0), ], ]; let mut fft = chfft::CFft2D::<f64>::with_len(input.len(), input[0].len()); let output = fft.forward0(&input);
fn forwardu(&mut self, source: &[Vec<Complex<T>>]) -> Vec<Vec<Complex<T>>>
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The \(\frac 1 {\sqrt n}\) scaling factor forward transform
extern crate chfft; extern crate num_complex; let input = [ vec![ num_complex::Complex::new(2.0, 0.0), num_complex::Complex::new(1.0, 1.0), num_complex::Complex::new(0.0, 3.0), num_complex::Complex::new(2.0, 4.0), ], vec![ num_complex::Complex::new(5.0, 0.0), num_complex::Complex::new(3.0, 1.0), num_complex::Complex::new(2.0, 3.0), num_complex::Complex::new(2.0, 8.0), ], ]; let mut fft = chfft::CFft2D::<f64>::with_len(input.len(), input[0].len()); let output = fft.forwardu(&input);
fn forwardn(&mut self, source: &[Vec<Complex<T>>]) -> Vec<Vec<Complex<T>>>
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The \(\frac 1 n\) scaling factor forward transform
extern crate chfft; extern crate num_complex; let input = [ vec![ num_complex::Complex::new(2.0, 0.0), num_complex::Complex::new(1.0, 1.0), num_complex::Complex::new(0.0, 3.0), num_complex::Complex::new(2.0, 4.0), ], vec![ num_complex::Complex::new(5.0, 0.0), num_complex::Complex::new(3.0, 1.0), num_complex::Complex::new(2.0, 3.0), num_complex::Complex::new(2.0, 8.0), ], ]; let mut fft = chfft::CFft2D::<f64>::with_len(input.len(), input[0].len()); let output = fft.forwardn(&input);
fn backward(&mut self, source: &[Vec<Complex<T>>]) -> Vec<Vec<Complex<T>>>
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The \(\frac 1 n\) scaling factor backward transform
extern crate chfft; extern crate num_complex; let input = [ vec![ num_complex::Complex::new(2.0, 0.0), num_complex::Complex::new(1.0, 1.0), num_complex::Complex::new(0.0, 3.0), num_complex::Complex::new(2.0, 4.0), ], vec![ num_complex::Complex::new(5.0, 0.0), num_complex::Complex::new(3.0, 1.0), num_complex::Complex::new(2.0, 3.0), num_complex::Complex::new(2.0, 8.0), ], ]; let mut fft = chfft::CFft2D::<f64>::with_len(input.len(), input[0].len()); let output = fft.backward(&input);
fn backward0(&mut self, source: &[Vec<Complex<T>>]) -> Vec<Vec<Complex<T>>>
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The 1 scaling factor backward transform
extern crate chfft; extern crate num_complex; let input = [ vec![ num_complex::Complex::new(2.0, 0.0), num_complex::Complex::new(1.0, 1.0), num_complex::Complex::new(0.0, 3.0), num_complex::Complex::new(2.0, 4.0), ], vec![ num_complex::Complex::new(5.0, 0.0), num_complex::Complex::new(3.0, 1.0), num_complex::Complex::new(2.0, 3.0), num_complex::Complex::new(2.0, 8.0), ], ]; let mut fft = chfft::CFft2D::<f64>::with_len(input.len(), input[0].len()); let output = fft.backward0(&input);
fn backwardu(&mut self, source: &[Vec<Complex<T>>]) -> Vec<Vec<Complex<T>>>
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The \(\frac 1 {\sqrt n}\) scaling factor backward transform
extern crate chfft; extern crate num_complex; let input = [ vec![ num_complex::Complex::new(2.0, 0.0), num_complex::Complex::new(1.0, 1.0), num_complex::Complex::new(0.0, 3.0), num_complex::Complex::new(2.0, 4.0), ], vec![ num_complex::Complex::new(5.0, 0.0), num_complex::Complex::new(3.0, 1.0), num_complex::Complex::new(2.0, 3.0), num_complex::Complex::new(2.0, 8.0), ], ]; let mut fft = chfft::CFft2D::<f64>::with_len(input.len(), input[0].len()); let output = fft.backwardu(&input);