R总结分箱数据

Question

我已按照此example分区并绘制了我的数据。现在，有人建议我在图表中添加一个条形图，显示每个bin中包含的数据量。

如何总结每个bin的行中的值？

Answer 1

我想我现在明白了：你想要所有适合bin的值的总和吗？ 您可以使用tapply：

n = 100
x = rnorm(n)
n.breaks = as.integer(sqrt(n))
bins = cut(x, breaks = n.breaks)

sums = tapply(x, bins, sum)
print(sums)

(-2.65,-2.17]    (-2.17,-1.7]    (-1.7,-1.23]  (-1.23,-0.754] (-0.754,-0.281] 
 -7.5825100      -7.6457772      -5.6796399      -8.6823512     -12.8808658 
(-0.281,0.193]   (0.193,0.666]    (0.666,1.14]     (1.14,1.61]     (1.61,2.09] 
 -0.8756864       8.1137694       7.5262578       4.1649094      10.8759823