R/rrumpars2logpars.R

In CDM: Cognitive Diagnosis Modeling

## File Name: rrumpars2logpars.R
## File Version: 0.05


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#   pi * r1^(1-a1) * r2^(1-a2)
#=pi * r1 * r2 * r1^(-a1) * r2^(-a2)
#=pi * r1 * r2 * (1/r1)^a1 * (1/r2)^a2
rrumpars2logpars <- function(v1){
    l1 <- rep(0,length(v1))
    l1[-1] <- log( 1 / v1[-1] )
    l1[1] <- log( prod(v1) )
    return(l1)
        }
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