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Function which computes the sum of predictors' weights for each subset containing a fixed number of predictors
sum_weights_sub(a,m,we,st)Returns an array of weights for predictors defined by each colun of the matrix a
an m x N matrix, containing all possible subsets (N overall) of the size m of predictors' indices; therefore each column of a defines a unique subset of the predictors
number of elements in each subset of indices
array of weights of the predictors
a subset of predictors to be always included into a predictive model
#all two-element subsets of the set 1:3
a<-combn(3,2)
sum_weights_sub(a,2,c(1,2,1))
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