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scripts default iconGenerate AR1 spatial data (Scripts) Publisher's description

This script generates artificial spatial data using a first order spatial autoregressive process (AR1)

This script generates artificial spatial data using a first order spatial autoregressive process (AR1)

The process is
X(i,j) = PHI*(X(i,j-1)+X(i,j+1)+X(i-1,j)+X(i+1,j) + error

To generate a 10x10, periodic spatial pattern, with normal error distribution, and a variance of SIGMA, the command is


or equivalently,

the same pattern, but with a rigid boundary is generated with


Different error distributions can be used. Using the current script this can be done by extracting the generator matrix, M

M = spatialPatternAR1([10,10],PHI,SIGMA,1,1)

M is a 100x100 matrix.
Then given a random vector, error (size = 100x1) with indepedent elements sampled from the required error distribution, the spatial pattern is given by

x = reshape(M * error,[10,10])

System Requirements:

MATLAB 6.5 (R13)
Program Release Status: New Release
Program Install Support: Install and Uninstall

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