Generate spatial data

バージョン 1.0.0.0 (2.63 KB) 作成者: Jon Yearsley
Generate 1/f noise spatial data.
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更新 2016/3/31

ライセンスの表示

The script generates spatial data with a scale-invariant power spectrum (1/f noise) and a normal error distribution.
The spectral density of the data is proportional to f^BETA, where f is the frequency and BETA is the spectral exponent (BETA=0 is white noise, BETA=-2 is Brown noise).

To generate Brown noise on a 10x10 grid you type

spatialPattern([10,10],-2)

which gives a 10x10 matrix containihng the data.

1/f noise is not stationary, and so doesn't have a well defined variance. A variogram of the data show variance linearly increasing with increasing lag.

Time series data can also be generated. For example, a pink noise time series of lenth 1000 is produced by

spatialPattern([1000,1],-1)

引用

Jon Yearsley (2024). Generate spatial data (https://www.mathworks.com/matlabcentral/fileexchange/5091-generate-spatial-data), MATLAB Central File Exchange. 取得済み .

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1.0.0.0

Update for BSD License
The original script defined beta to be a factor of two different from standard value. This has now been corrected.