Figure 2
From: Network-based de-noising improves prediction from microarray data
Off-subspace de-noising method. This figure illustrates how to de-noise an expression vector using a principal subspace. Instead of simple projection, we simultaneously find two points (off-subspace solution and on-subspace solution) which minimize the sum of ℓ1-norm distance and ℓ∞-norm distance given in Eq. 2.