R/gdina_create_designmatrices_monotonicity_constraints.R

In CDM: Cognitive Diagnosis Modeling

## File Name: gdina_create_designmatrices_monotonicity_constraints.R
## File Version: 0.05

gdina_create_designmatrices_monotonicity_constraints <- function(Ajjj)
{

    N_Ajjj <- nrow(Ajjj)
    Ajjj_sum <- rowSums(Ajjj)

    # compute distance matrix
    dist_Ajjj <- matrix( -9, nrow=N_Ajjj, ncol=N_Ajjj )
    for (ii in 1:(N_Ajjj-1) ){
        for (hh in (ii+1):N_Ajjj){
            dist_Ajjj[hh,ii] <- sum( abs( Ajjj[hh,] - Ajjj[ii,] ) )
        }
    }
    # define matrix for testing monotonicity constraints
    NC <- sum( dist_Ajjj==1 )
    Ajjj_mono <- matrix( 0, nrow=NC, ncol=N_Ajjj)
    uu <- 1
    for (ii in 1:N_Ajjj ){
        for (hh in 1:N_Ajjj){
            if ( dist_Ajjj[hh,ii]==1 ){
                Ajjj_mono[uu,c(hh,ii) ] <- c(1,-1)
                uu <- uu + 1
            }
        }
    }
    return(Ajjj_mono)
}