matrixW_chain: The updated matrixW during the Gibbs sampling
Description
The updated matrixW in each recorded iteration, with
format similar to matrixZ_chain.format
The format is:
List of 2
$ : num [1:5, 1:300] 0 0 0 0.348 0 ...
$ : num [1:5, 1:300] -0.651 -0.868 -1.013 -0.868 -0.938 ...