[GRASS-user] Re: Calculating standard error of many maps?

[Moritz Lennert]

On 09/02/09 17:19, John C. Tull wrote:
> On Feb 9, 2009, at 8:15 AM, Moritz Lennert wrote:
> 
>> On 09/02/09 16:59, Rainer M Krug wrote:
>>> Just one clarification: I would like to calculate these descriptive
>>> stats for each cell, to obtain "variability maps".
>>> Rainer
>>> On Mon, Feb 9, 2009 at 5:57 PM, Rainer M Krug <r.m.krug at gmail.com 
>>> <mailto:r.m.krug at gmail.com>> wrote:
>>>> Hi
>>>>
>>>> I have 25000 maps, generated by simulation predictions, and I would
>>>> like to calculate some descriptive stats, like mean, standard
>>>> deviation, median, quartiles.
>>>>
>>>> Is there an easy way of doing this in GRASS?
>>
>>
>> r.series ?
>>
>> You will probably have to use xargs to collate that many map names...
> 
> Or you can use g.mlist if the names have a common prefix, suffix, etc. 
> This assumes you want a single map that displays the result of all the 
> input maps.
> 
> E.g.
> 
> r.series input="`g.mlist rast pattern='prefix_*' sep=,`" 
> output=prefix_stddev method=stddev

Yes, but if I'm not mistaken, this won't work with 25000 maps as it 
would create a too long command line. But please correct me if I'm wrong.

Moritz