| xtableHline | R Documentation | 
Calculate vector of hline positions for xtable's hline.after parameter
xtableHline(ngroup, nsize)
| ngroup | number of groups in the table | 
| nsize | number of members in each group | 
vector of hline positions
xtableHline(5,4)
xtableHline(3,c(4,3,2))
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