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Structure for Data
list.str(x, n = 3)
a dataframe or matrix
the maximum level number to display
a dataframe contains variable names and class
# NOT RUN { jh=data.frame(x=c(1,2,3,1), k=c(4,5,6,7), h=c('a','a','b','b')) list.str(x = jh) # }
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