r - How to customize values on x-axis in qplot()? -


i using qplot following code.

 qplot(topn, f1score, data = evaluation.data, geom = c("point", "line"), color= recommender, main = "f1 score...")

the x-axis topn , y-axis f1score. x-axis supposed contain integer values. there's decimals shown in figure. how can customize use integer values? enter image description here

you can use breaks argument in scale_x_continuous. 

qplot(topn,        f1score,        data = evaluation.data,        geom = c("point", "line"),        color= recommender,        main = "f1 score...") +    scale_x_continuous(breaks=c(5, 10, 15))

also color guide not seem useful. remove legend. 

+ scale_color_discrete(guide="none")

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