# reclassify

From raster v2.1-41
by Robert Hijmans

##### Reclassify

Reclassify values of a Raster* object. The function (re)classifies groups of values to other values. For example, all values between 1 and 10 become 1, and all values between 11 and 15 become 2 (see functions `subs`

and `cut`

for alternative approaches).
Reclassification is done with matrix `rcl`

, in the row order of the reclassify table. Thus, if there are overlapping ranges, the first time a number is within a range determines the reclassification value.

- Keywords
- spatial

##### Usage

```
## S3 method for class 'Raster':
reclassify(x, rcl, filename='', include.lowest=FALSE, right=TRUE, ...)
```

##### Arguments

- x
- Raster* object
- rcl
- matrix for reclassification. This matrix must have 3 columns. The first two columns are "from" "to" of the input values, and the third column "becomes" has the new value for that range. (You can also supply a vector that can be coerced into a n*3 matrix (
- filename
- character. Output filename (optional)
- include.lowest
- logical, indicating if a value equal to the lowest value in rcl (or highest value in the second column, for right = FALSE) should be included. The default is
`FALSE`

- right
- logical, indicating if the intervals should be closed on the right (and open on the left) or vice versa. The default is
`TRUE`

. A special case is to use right=NA. In this case both the left and right intervals are open - ...
- additional arguments as for
`writeRaster`

##### Value

- Raster* object

##### See Also

##### Examples

```
r <- raster(ncols=36, nrows=18)
r[] <- runif(ncell(r))
# reclassify the values into three groups
# all values >= 0 and <= 0.25 become 1, etc.
m <- c(0, 0.25, 1, 0.25, 0.5, 2, 0.5, 1, 3)
rclmat <- matrix(m, ncol=3, byrow=TRUE)
rc <- reclassify(r, rclmat)
# equivalent to
rc <- reclassify(r, c(-Inf,0.25,1, 0.25,0.5,2, 0.5,Inf,3))
```

*Documentation reproduced from package raster, version 2.1-41, License: GPL (>= 3)*

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