.\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.47.13.
.TH GBKER "1" "June 2021" "gbker 6.2" "User Commands"
.SH NAME
gbker \- Produce kernel density estimation
.SH SYNOPSIS
.B gbker
[\fI\,options\/\fR]
.SH DESCRIPTION
Compute the kernel density estimation on an equispaced grid. Data are read
from standard input. The kernel bandwidth, if not provided with the option
\fB\-H\fR, is set automatically using simple heuristics. Normally the whole support
is displayed. The option \fB\-w\fR can be used to restrict the computation to specific
range of values. The method used to compute the density is set by the option \fB\-M\fR.
The boundaries of the grid are slightly different in the different cases.
.SH OPTIONS
.TP
\fB\-n\fR
number of equispaced points/bins where the density is computed (default 64)
.TP
\fB\-w\fR
set the grid boundaries with min,max (default whole support)
.TP
\fB\-H\fR
set the kernel bandwidth
.TP
\fB\-S\fR
scale the automatic kernel bandwidth
.TP
\fB\-K\fR
choose the kernel to use  (default 0)
.TP
0
Epanenchnikov
.TP
1
Rectangular
.TP
2
Gaussian
.TP
3
Laplacian
.TP
\fB\-M\fR
choose the method for density computation (default 0)
.TP
0
use FFT (# grid points rounded to nearest power of 2)
.TP
1
use discrete convolution (compact kernels only; bins>2)
.TP
2
explicit summation (boundaries excluded)
.TP
\fB\-F\fR
specify the input fields separators (default " \et")
.SH EXAMPLES
.TP
gbker \-n 128 \-K 2 < file
use a Gaussian kernel to compute the density on 128
equispaced points with the FFT approach. All the data
in 'file' are used, multiple columns are pooled.
.TP
gbker \-K 3 \-M 2 < file
use a Laplacian kernel to compute the density on 64 points.
The method used is the explicit summation.
.SH AUTHOR
Written by Giulio Bottazzi
.SH "REPORTING BUGS"
Report bugs to <gbutils@googlegroups.com>
.PP
.br
Package home page <http://cafim.sssup.it/~giulio/software/gbutils/index.html>
.SH COPYRIGHT
Copyright \(co 2001\-2018 Giulio Bottazzi
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
(version 2) as published by the Free Software Foundation;
.PP
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.