Question

How to scatter plot the following:

  var1  var2
1  10  2
2  20  4
3  30  8
4  40  16
5  80  32

I need to color var1 and var2 with difft colors. x-axis should range from 1 to 5. How can I add a line showing trend of the data?

Answer 1

Your question is not very clear, but assuming your data is in df, it sounds like you want something like this to get started:

plot(1:5, df$var1, pch=19, col="blue", ylim=c(0,80))
points(1:5, df$var2, pch=19, col="red")

As for the trend of the data, what do you mean? A trend for each line? Or do you actually want to plot var1 against var2 (I have assumed you don’t want that otherwise there would be no point having two colours).