The factor activity matrix
The factor activity matrix with dimension K*J. matrixX[k,j] is the activity value of the k-th latent factor (e.g., pathway) in the j-th sample (e.g., cell line). Real continuous value with mean 0 and SD 1.
The format is: num [1:10, 1:15] -0.647 0.405 -0.824 1.463 0.998 ...
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