r语言中hist的结果的纵坐标怎么选择是density和frequency

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x=c(1:100)
hist(x)
hist(x,breaks=2)
hist(x,breaks=c(0,10,30,50,100))
第二行和第三行出来的纵坐标都是frequency，第四行出来的结果是density,怎么选择是density和frequency？

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关键词：Frequency Density Ency hist freq frequency

frequency:hist(x,freq=T)
density:hist(x,freq=F)

freq        

logical; if TRUE, the histogram graphic is a representation of frequencies, the counts component of the result; if FALSE, probability densities, component density, are plotted (so that the histogram has a total area of one). Defaults to TRUE if and only if breaks are equidistant (and probability is not specified).

hist(x, breaks = "Sturges",
     freq = NULL, probability = !freq,
     include.lowest = TRUE, right = TRUE,
     density = NULL, angle = 45, col = NULL, border = NULL,
     main = paste("Histogram of" , xname),
     xlim = range(breaks), ylim = NULL,
     xlab = xname, ylab,
     axes = TRUE, plot = TRUE, labels = FALSE,
     nclass = NULL, warn.unused = TRUE, ...)