Get Wavenumbers

Class: kwave.toolbox.Grid Package: kwave.toolbox

Create vector of wavenumbers.

Syntax

kVec = getWavenumbers(numGridPoints, gridSpacing)

Description

Creates the vector of wavenumbers (spatial frequencies) for use with the MATLAB fft functions. Internally, MATLAB uses FFTW, so the frequency bins match those used by FFTW. The DC component is returned in the centre of the spectrum. Use ifftshift to transform this so the DC component is the first element.

Input Arguments

• numGridPoints - (double) Number of grid points.
• gridSpacing - (double) Grid point spacing [m].

Output Arguments

• kVec - (double) Wavenumber vector.