R/extend.label.group.R

In TAM: Test Analysis Modules

## File Name: extend.label.group.R
## File Version: 9.11


#--- extend labels arranged in a group
extend.label.group <- function( label.group )
{
    str1 <- unlist( strsplit( label.group, split="__" ) )
    M1 <- min( nchar(str1) )
    M2 <- max( nchar(str1) )
    # extract types of labels
    str1a <- strsplit( str1[1], split="" )
    str2a <- strsplit( str1[2], split="" )
    dfr2 <- matrix( NA, nrow=M2, ncol=5)
    dfr2[1:M1,1] <- unlist(str1a)
    dfr2[1:M2,2] <- unlist(str2a)
    dfr2 <- as.data.frame(dfr2)
    letters_all <- c( LETTERS, letters )
    dfr2[,3] <- paste(dfr2[,1]) %in% letters_all
    dfr2[,4] <- paste(dfr2[,2]) %in% letters_all
    dfr2[,5] <- paste(dfr2[,1])==paste(dfr2[,2])
    ii0 <- 0
    for (ii in 1:M1){
        if ( dfr2[ii,5] ){
            ii0 <- ii0+1
        }
    }
    if (ii0==M1){ ii0 <- ii0-1 }
    ii <- ii0
    l1 <- as.numeric( substring( str1, ii+1 )    )
    str2 <- seq( l1[1], l1[2] )
    str2 <- paste0( substring( str1, 1, ii  )[1], str2 )
    return(str2)
}