Maxima in R Abweichende durch Befehl

Question

ich folgende R-Code haben:

library(ggplot2) 
data(diamonds) 
by(diamonds$price, diamonds$cut, summary) 
by(diamonds$price, diamonds$cut, max) 

Das gibt mir:

diamonds$cut: Fair 
Min. 1st Qu. Median Mean 3rd Qu. Max. 
337 2050 3282 4359 5206 18570 
---------------------------------------------- 
    diamonds$cut: Good 
Min. 1st Qu. Median Mean 3rd Qu. Max. 
327 1145 3050 3929 5028 18790 
---------------------------------------------- 
    diamonds$cut: Very Good 
Min. 1st Qu. Median Mean 3rd Qu. Max. 
336  912 2648 3982 5373 18820 
---------------------------------------------- 
    diamonds$cut: Premium 
Min. 1st Qu. Median Mean 3rd Qu. Max. 
326 1046 3185 4584 6296 18820 
---------------------------------------------- 
    diamonds$cut: Ideal 
Min. 1st Qu. Median Mean 3rd Qu. Max. 
326  878 1810 3458 4678 18810 

diamonds$cut: Fair 
[1] 18574 
---------------------------------------------- 
    diamonds$cut: Good 
[1] 18788 
---------------------------------------------- 
    diamonds$cut: Very Good 
[1] 18818 
---------------------------------------------- 
    diamonds$cut: Premium 
[1] 18823 
---------------------------------------------- 
    diamonds$cut: Ideal 
[1] 18806 

Ich verstehe nicht, warum die Maxima in diesen beiden Tabellen unterscheiden. Sollten die Maxima nicht gleich sein?

Answer 1

es ist die Ziffern Argument ?summary

by(diamonds$price, diamonds$cut, function(x) summary(x, digits = 10 ))` 

geben gleiche wie max