How can I get a histogram/summary stats if I have a table with counts? [duplicate]

问题

This question already has answers here:

How can I create a histogram from aggregated data in R? (4 answers)

R Newbie - Histograms/Frequency of values incorporating a quantity Column [duplicate] (1 answer)

Closed 5 years ago.

I'm used to having a vector of observations like c(1,1,1,3,4) on which I can see summary statistics and plot histograms etc...but now I find myself with, the same data, but in a compressed format like this:

value, numObs
1, 3
3, 1
4, 1

How can I easily "unwrap" this easily into the vector or view the same summary stats or histogram plots when the data is expressed in a data.frame as above?

回答1:

Unwrapping the data:

unwrapped <- rep(value, numObs)

If you're happy with the binning of your "compressed form" then see ?barplot for plotting it. You would want to fill the zeros first, like:

v <- numeric(max(value))
v[value] <- numObs
barplot(v)

回答2:

A possible solution:

with(df, rep(value, numObs))

where df is the name of your data.frame.

来源：https://stackoverflow.com/questions/23839177/how-can-i-get-a-histogram-summary-stats-if-i-have-a-table-with-counts