Muhammad -
Here's one way:
files = c('File1','File2','File3')
themats = lapply(files,read.table)
ans = matrix(0,3,3)
for(i in 1:3)for(j in 1:3)ans[i,j] = sd(sapply(themats,function(x)x[i,j]))
Here's another
files = c('File1','File2','File3')
themats = lapply(files,read.table)
ans =
outer(1:3,1:3,Vectorize(function(i,j)sd(sapply(themats,function(x)x[i,j]))))
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
spec...@stat.berkeley.edu
On Fri, 4 Dec 2009, Muhammad Rahiz wrote:
Hello R-users,
I would like to know how to find the standard deviation for each element in a
set of matrices.
Given the following files,
File1 File2 File3
1 1 1 4 4 4 7 7 7
2 2 2 5 5 5 8 8 8
3 3 3 6 6 6 9 9 9
I want to calculate the standard deviation for every cell in the file (I'm
using gridded data). The desired output is
Output
3 3 3
3 3 3
3 3 3
Thanks.
Muhammad
--
Muhammad Rahiz | Doctoral Student in Regional Climate Modeling
Climate Research Laboratory, School of Geography & the Environment
Oxford University Centre for the Environment
South Parks Road, Oxford, OX1 3QY, United Kingdom Tel: +44 (0)1865-285194
Mobile: +44 (0)7854-625974
Email: muhammad.ra...@ouce.ox.ac.uk
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