These 20 samples of aCGH data are simulated using the Fused Lasso Latent Feature model with 5 features, as described in Section 4 of Nowak and others (2011).
A matrix consisting of 1000 probes (rows) and 20 samples (columns).
G. Nowak, T. Hastie, J. R. Pollack and R. Tibshirani. A Fused Lasso Latent Feature Model for Analyzing Multi-Sample aCGH Data. Biostatistics, 2011, doi: 10.1093/biostatistics/kxr012