SLEPTAP is the jSpectral module of jLab.

 SLEPTAP  Calculate Slepian tapers.
    [PSI,LAMBDA]=SLEPTAP(N,P,K) calculates the K lowest-order Slepian
    tapers PSI of length N and time-bandwidth product P, together with
    their eigenvalues LAMBDA. PSI is N x K and LAMBDA is K x 1.
    K is optional and defaults to 2P-1.  
    P is optional and defaults to 4.
    For N<=512, SLEPTAP uses the tridiagonal method described in Percival 
    and Walden (1993).  For N>512, it first computes tapers for N=512 and 
    then spline-interpolates.
    N may also be an array of lengths.  In this case PSI is a cell array of 
    matrices, with PSI{1} being N(1) x K, PSI{2} being N(2) x K, etc., 
    while LAMBDA is K x LENGTH(N).  See 'Cell array input' under MSPEC.
    By default, the tapers are set to have unit energy. Alternatively
    SLEPTAP(...,'bandpass') uses the "bandpass" normalization in which the
    tapers are rescaled so that the maximum value of the Fourier transform
    of the first taper is set to two. 
    See WAVETRANS for details on bandpass normalization.  
    SLEPTAP(N, ...,'parallel') when N is an array of lengths parallelizes 
    the taper computation using a PARFOR loop.  This requires that Matlab's
    Parallel Computing Toolbox be installed.
    'sleptap --t' runs some tests.  
    Usage:  [psi,lambda]=sleptap(n); 
    This is part of JLAB --- type 'help jlab' for more information
    (C) 2000--2017 J.M. Lilly --- type 'help jlab_license' for details        

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