## DESCRIPTION

r.series makes each output cell value a function of the values assigned to the corresponding cells in the input raster map layers. Following methods are available:

- average: average value
- count: count of non-NULL cells
- median: median value
- mode: most frequently occuring value
- minimum: lowest value
- maximum: highest value
- stddev: standard deviation
- sum: sum of values
- variance: statistical variance
- diversity: number of different values
- slope: linear regression slope
- offset: linear regression offset

## NOTES

With -n flag, any cell for which any of the corresponding input cells are NULL is automatically set to NULL. The aggregate function is not called, so all methods behave this way with respect to the -n flag.

Without -n flag, the complete list of inputs for each cell (including NULLs) is passed to the aggregate function. Individual aggregates can handle data as they choose. Mostly, they just compute the aggregate over the non-NULL values, producing a NULL result only if all inputs are NULL.

## EXAMPLE

Using r.series with wildcards:
`r.series input="`g.mlist pattern='insitu_data.*' sep=,`" output=insitu_data.stddev method=stddev`

Note the g.mlist script also supports regular expressions for selecting map names.

## SEE ALSO

g.mlist, g.region

## AUTHOR

Glynn Clements

Last changed: $Date: 2005/02/28 16:39:14 $