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Generate a scatter plot with text overlay. This plot is to better show the effect of the text variable in the domain of x and y variable.
pl.3txt(x,y,txt,title)
:a numeric vector
:a vector used as labels
:title of the graph
# NOT RUN { pl.3txt(mtcars[,1], mtcars[,3], row.names(mtcars),"mpg v. cyl") # }
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