MODE = extractmode(V, INDEX) extracts, using Fourier transform,
the eigenmode, i.e. the spatial structure of a mode at a given
frequency #INDEX, from the velocity or scalar field time series V.
The returned field MODE is a PIVMat structure, defined as the temporal
band-pass filter at frequency #INDEX of the input fields. The frequency
integer INDEX is the peak number in the temporal spectrum, and can be
obtained from the function tempspecf.
Published output in the Help browser
showdemo extractmode