[R] frequency of labels in a barplot

[R_Learner]

I'm trying to control the number of labels in the x-axis of my plot. My code
is the following: 

graph1<-barplot(total_skew)
axis(1,at = graph1,labels=raw_date[1:length(total_skew)], las=2)

however, the length of my "total_skew" parameter is a few thousand elements,
and all the labels on the x-axis are overlapping and cluttered. How do I
specify the frequency or number of labels I want on the x-axis in the axis()
function? Thanks!
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