POLYSMOOTH_KERNEL is the jMap module of jLab.

 POLYSMOOTH_KERNEL  Returns the weighting kernel employed by POLYSMOOTH.
    POLYSMOOTH_KERNEL is a low-level function called by POLYSMOOTH. 
    W=POLYSMOOTH_KERNEL(DS,[],B,KERNSTR) where DS is an array of distances 
    and B is a bandwidth, returns the value of the weighting function 
    specified by the string KERNSTR at distances DS.  
    See POLYSMOOTH for valid choices of the string KERNSTR.
    B is either a scalar, or a matrix the same size as DS(:,:,1).
    W=POLYSMOOTH_KERNEL(DS,[],B,L) where L is a scalar uses a Gaussian with 
    a standard deviation set to B/L, as in W=EXP(-1/2*(L*DS/B)^2).
    W=POLYSMOOTH_KERNEL(DS,[],B,K) where K is an array takes K to be a 
    custom kernel, with K(1) corresponding to DS/B=0 and K(end) to DS/B=1, 
    interpolates within K to find the weight W at any distance.
    W=POLYSMOOTH_KERNEL(T,[],TAU,KERNSTR) works in just the same way if T 
    is a time deviation and TAU is a temporal bandwidth.
    W=POLYSMOOTH_KERNEL(DS,WS,B,KERNSTR) optionally multiplies W, after 
    computed as described above, by the additional weights given in WS.  
    See also POLYSMOOTH.
    Usage: W=polysmooth_kernel(d,[],B,kernstr);
    This is part of JLAB --- type 'help jlab' for more information
    (C) 2018--2020 J.M. Lilly --- type 'help jlab_license' for details

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