plot(airmiles)Ībline(c(5000, 25000), col='blue', lty=2, lwd=4)Ībline(5000, 0, col='blue', lty=2, lwd=4)Ībline(25000, 0, col='blue', lty=2, lwd=4) Abline in R – Drawing a slopeįor our next example, we will demonstrate how to draw a sloped trend line. There’s syntax that can simplify this for horizontal lines. In this next example, we’re going to draw a range of two lines on the chart. plot(airmiles)Ībline(v=1955, col='blue', lty=2, lwd=5) Abline in R – Multiple Lines We can edit our R plot line thickness, do a dotted abline in R, and add color to abline in R. Moving past basic black and white, we can easily adapt the abline function to draw lines in color and in different formats. abline in R – Vertical Line Abline in R – Color and Line Types This draws a lovely vertical line at the x = 1955 level. Perhaps our client would like to see a line at the year 1955. We can also easily add a vertical line to the graph, similar to a dropline in Excel. Now for some tips on vertical line segment drawing. Maybe we are very interested in seeing when the total miles traveled is above 20,000. How do you add a horizontal line to an existing plot in R code? First, lets start by drawing a horizontal line on the graph. It shows the growth of airline travel within the US in a linear model. > airmilesĪs you can see, airmiles is a nice basic timeseries data frame. This is one of the default datasets available in R. You also cannot create any sort of legend text or legend function with this particular abline function, or create different line types like a boxplot. You can use a number of different numeric vector or variable types, though because it is a line you are subject to some size and axis limits, and cannot use a character vector type argument to create the line or curve.
We’re going to use the airmiles dataset for this tutorial on how to plot a line in r code. lwd – optional line width parameter Initial Setup – Examples.col – optional color parameter for the line.reg – a regression object generated by the coef method intended to simplifying passing trend-lines from a regression calculation.coef – a vector of length two giving the intercept and slope.v – the x-value(s) for vertical line(s).h – the y-value(s) for horizontal line(s).b – The slope of a line, as a single value.a – The intercept of the line, as a single value.
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