GenStrucData_Count_normal: Generate count data
In DongyueXie/scca: Sparse Canonical Correlation Analysis - Intergrated Methods

Generate count data, using normal data from latent variable model

1 2	GenStrucData_Count_normal(u, v, n = 50, n_y = 1000, n_x = 1000, theta = 0.01, sigma_z = 1, sigma_x = NULL, sigma_y = NULL)

`u:`	caonical coefficients for x
`v:`	canonical coefficients for y
`n:`	sample size
`sigma_z:`	sd of the latent variable z, scalar
`sigma_x:`	covariance matrix of x, default to be identity
`sigma_y:`	covariance matrix of y, default to be identity
`n_y:`	parameter n in DM model
`n_x:`	parameter n in DM model
`theta:`	oversidpersion parameter in DM model