Function 'X_sampling' estimates the hidden activities of each transcription factor, according to a posterior Gaussian random process.
X_sampling(Y, C, A, X_old, base_line, C_prior, sigma_noise, sigma_A,
sigma_baseline, sigma_X)gene expression data matrix
sampled TF-gene binding network
sampled regulatory strength matrix
sampled transcription factor activity matrix from the previous round
sampled gene expression baseline activity
prior TF-gene binding network
variance of gene expression fitting residuals
variance of regulatory strength
variance of gene expression baseline activity
variance of transcription factor activity