This function creates an object which describes constraints over the model parameters.
1  getModelStructure(mean = "D", between = "D", within = "D", cov = "D")

Each argument is a single character, by default equal "D" (Different). If argument is set to "E" (or "0" for the argument cov
) then the given parameter is constrained. By default all arguments are set to "D".
mean 

between 

within 

cov 

List of four elements specifying the constraints on 1) relations between the component means, 2) relations between the covariance matrices of the model components, 3) relations within each covariance matrix and 4) the covariances within each matrix. By default, the function returns an unconstrained structure.
Ewa Szczurek
Przemyslaw Biecek, Ewa Szczurek, Martin Vingron, Jerzy Tiuryn (2012), The R Package bgmm: Mixture Modeling with Uncertain Knowledge, Journal of Statistical Software.
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