hexgrid: Produces the nodes of an equidistant grid.
In simba: A Collection of functions for similarity analysis of vegetation data

Description Usage Arguments Details Value Author(s) References See Also Examples

Given the coordinates of a starting point (left upper point of the grid), the function produces the nodes of an equidistant grid. Extent and distance between plots can be specified.

1	hexgrid(x, y, r = 100, nro = 10, nco = 20)

`x`	`x`-value of the starting point. Defaults to 0.
`y`	`y`-value of the starting point. Defaults to 0.
`r`	Distance between nodes. Defaults to 100.
`nro`	Number of rows in the grid. Defaults to 10
`nco`	Number of columns in the grid. Defaults to 20. They are doubled (see the grid) compared to the rows. That's why 2*`nro` produces a quadratic grid.

If the overall shape of the grid is not square, the user has to delete by hand the superfluous units. Might get more flexible in future versions.

Returns a data.frame giving informations on the produced point/unit/plot locations with the following columns:

`ROW`	Number of row in the grid to which the point/unit/plot belongs.
`COL`	Number of column in the grid to which the point/unit/plot belongs.
`X`	x-coordinate of the point.
`Y`	y-coordinate of the point.

Gerald Jurasinski

http://homepage.mac.com/terhorab/gerald/downloads/whyhexaagons.pdf

spsample

## produces a grid with r=400:    
test.grd <- hexgrid(456000, 7356700, r=400)
## for plotting the following is recommended as it preserves 
## real positions:
library(geoR)
points.geodata(coords=test.grd[,3:4], data=rnorm(nrow(test.grd)))

Loading required package: vegan
Loading required package: permute
Loading required package: lattice
This is vegan 2.5-4
This is simba 0.3-5

Attaching package: 'simba'

The following object is masked from 'package:stats':

    mad

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 Analysis of Geostatistical Data
 For an Introduction to geoR go to http://www.leg.ufpr.br/geoR
 geoR version 1.7-5.2.1 (built on 2016-05-02) is now loaded
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Warning message:
no DISPLAY variable so Tk is not available