Hi,

I would like to produce a plot with a symbol on every nth point in a time
series data, like the one in the following:

http://www.phon.ucl.ac.uk/home/yi/ProsodyPro/EnglishFocus.png

x <- seq(-100,1000,25)
plot(x,type="l")

Could someone help me out with the above example?

Thanks....

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