ifftshift: Inverse FFT shift of a 2d matrix.

In mrbsizeR: Scale Space Multiresolution Analysis of Random Signals

Inverse FFT shift of a 2d matrix.

Description

ifftshift is an R equivalent to the Matlab function ifftshift applied on matrices. For more information about ifftshift see the Matlab documentation.

Usage

ifftshift(inputMatrix, dimension = -1)

Arguments

inputMatrix	Matrix to be swapped.
dimension	Which swap should be performed? 1: swap halves along the rows. 2: swap halves along the columns. -1: swap first quadrant with third and second quadrant with fourth.

Details

ifftshift is the inverse function to fftshift. For more information see the details of fftshift

Value

Swapped matrix.

Examples

set.seed(987)
sampleMat <- matrix(sample(1:10, size = 25, replace = TRUE), nrow = 5)

# Swap halves along the rows:
ifftshift(sampleMat, dimension = 1)

# Swap halves along the columns:
ifftshift(sampleMat, dimension = 2)

# Swap first quadrant with third and second quadrant with fourth:
ifftshift(sampleMat, dimension = -1)

mrbsizeR documentation built on May 29, 2024, 5:45 a.m.