trim function

Trim

Trim (shrink) a Raster* object by removing outer rows and columns that all have the same value (e.g. NA).

Or remove the whitespace before or after a string of characters (or a matrix, or the character values in a data.frame).

## S4 method for signature 'Raster'
trim(x, padding=0, values=NA, filename='', ...)
## S4 method for signature 'character'
trim(x, internal=FALSE, ...)

Arguments

• x: Raster* object or a character string
• values: numeric. Value(s) based on which a Raster* should be trimmed
• padding: integer. Number of outer rows/columns to keep
• filename: character. Optional output filename
• internal: logical. If TRUE, sequential internal spaces are replaced by a single space
• ...: If x is a Raster* object: additional arguments as for writeRaster

Returns

A RasterLayer or RasterBrick object (if x is a Raster* object) or a character string (if x is a character string).

Author(s)

Robert J. Hijmans and Jacob van Etten

Examples

r <- raster(ncol=18,nrow=18)
r[39:49] <- 1
r[113:155] <- 2
r[200] <- 6
s <- trim(r) 

trim("    hi folks    !   ")