nt"><pre class="comment">[z,idx]=nt_pca(x,shifts,nkeep,threshold,w) - time-shift pca

  z: pcs
  idx: x(idx) maps to z

  x: data matrix
  shifts: array of shifts to apply
  keep: number of components shifted regressor PCs to keep (default: all)
  threshold: discard PCs with eigenvalues below this (default: 0)
  w: weights

 Beware: mean is NOT removed prior to processing.</pre></div>

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