---
name: "gbker2d"
section: "1"
platform: "linux"
package: "gbutils"
version: "6.3-1+b1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/gbker2d"
---

# gbker2d(1)

Kernel density estimate for bivariate data

## NAME

gbker2d - Kernel density estimate for bivariate data

## SYNOPSIS

**gbker2d** \[*options*\]

## DESCRIPTION

2D kernel density estimation on an equispaced grid. Data are read from standard input as couple (x,y). The kernel bandwidth if not provided with the option **-H** is set automatically. Different bandwidths can be specified for x and y.

## OPTIONS

- **-n**

  number of points where the density is computed (default 10) use comma (,) to specify different values for x and y components

- **-H**

  set the kernel bandwidth explicitly; use comma (,) to specify different values for x and y components

- **-S**

  scale the kernel bandwidth with respect to euristic 'optimal' value; use comma (,) to specify different values for x and y components

- **-K**

  choose the kernel to use: 0: Epanenchnikov 1: Rectangular 2: Silverman type 1 3: Silverman type 2 (default 0)

- **-D**

  switch off data de-variation procedure

- **-v**

  verbose mode

- **-F**

  specify the input fields separators (default " \\t")

- **-h**

  this help

## EXAMPLES

- gbker2d -n 10,20 -K 1 \< file

  compute the kernel on an equispaced grid 10x20 using a rectangular kernel

## AUTHOR

Written by Giulio Bottazzi

## REPORTING BUGS

Report bugs to \<gbutils@googlegroups.com\>

Package home page \<http://cafim.sssup.it/~giulio/software/gbutils/index.html\>

## COPYRIGHT

Copyright © 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;

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.