SPOD() is a Matlab implementation of the frequency domain form of proper orthogonal decomposition (POD, also known as principle component analysis or Karhunen-Loève decomposition) called spectral ...
After plotting the PDF for each nanoparticle, the first valley of the PDF was used as the nearest-neighbour cut-off distance to calculate the local BOO parameters (Fig. 1f, Extended Data Fig. 2h–n).
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