mrbsizeR (version 1.3)

ifftshift: 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)

Value

Swapped matrix.

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

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)