extendHorVer {mvngGrAd}

Vertical and horizontal extension of the grid ('cross shape')

Description

The function finds the subscripts of the cells that extend from the center in 0, 90, 180 and 270 degree direction ('cross shape'). The function is not intended to be called by the user.

Usage

extendHorVer(i, j, shapeCross, rowLimit, colLimit)

Arguments

i

"integer", row subscript of center cell

j

"integer", column subscript of center cell

shapeCross

"list" of length 4, each element contains the cells that are to be included in the grid that extends from the center in 0, 90, 180 and 270 degree direction.

Elements can be NULL (no extension in this direction) and must contain no '0', duplicated or negative values.

shapeCross[[1]]DOWN (180 degree) from the center cell (same column)

shapeCross[[2]]UP (0 degree) from the center cell (same column)

shapeCross[[3]]LEFT (270 degree) from the center cell (same row)

shapeCross[[4]]RIGHT (90 degree) from the center cell (same row)

rowLimit

"integer", row limit (= number of rows) of the field layout

colLimit

"integer", column limit (= number of columns) of the field layout

Details

This function is called by the function movingGrid and is not intended to be called by the user.

Value

A matrix with the row subscripts of the cells in column one and the column subscripts in column two.

Rdversion

1.1

Author(s)

Frank Technow

Examples

shape <- list(c(1,2,3),
              c(1,2,3),
              c(1:5),
              c(1:5))

extendHorVer(i = 25,
             j = 25,
             shapeCross = shape,
             rowLimit = 50,
             colLimit = 50)