| // Copyright ©2020 The Gonum Authors. All rights reserved. | |
| // Use of this source code is governed by a BSD-style | |
| // license that can be found in the LICENSE file. | |
| package fftpack | |
| // swap returns c with the real and imaginary parts swapped. | |
| func swap(c complex128) complex128 { | |
| return complex(imag(c), real(c)) | |
| } | |
| // scale scales the complex number c by f. | |
| func scale(f float64, c complex128) complex128 { | |
| return complex(f*real(c), f*imag(c)) | |
| } |