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Build Graph Manually
How to build a graph manually using the built-in graphics package?
✍: FYIcenter.com
You can build a graph manually using low level functions provided
in built-in graphics package as show below:
> # get a sample of x-y coordinates > sample = stats::lowess(cars) > sample $x [1] 4 4 7 7 8 9 10 10 10 11 11 12 12 12 12 13 13 13 13 ... [32] 18 18 18 18 19 19 19 20 20 20 20 20 22 23 24 24 24 24 25 $y [1] 4.965459 4.965459 13.124495 13.124495 15.858633 18.579691 ... [10] 24.129277 24.129277 27.119549 27.119549 27.119549 27.119549 ... [19] 30.027276 32.962506 32.962506 32.962506 32.962506 36.757728 ... [28] 40.435075 43.463492 43.463492 43.463492 46.885479 46.885479 ... [37] 50.793152 50.793152 56.491224 56.491224 56.491224 56.491224 ... [46] 78.643164 78.643164 78.643164 78.643164 84.328698 > typeof(sample) [1] "list" > # get data ranges in x-axix and y-axis > xrange = range(sample[1]) > xrange [1] 4 25 > yrange = range(sample[2]) > yrange [1] 4.965459 84.328698 > # open a new graph and set the window's range > plot.new() > plot.window(xrange, yrange) > # add x-axix and y-axis > axis(1) > axis(2) > # draw points on x-y coordinates > points(sample) > # draw lines connecting x-y coordinates > lines(sample) > # draw a box around the window > box() > # add a title > title(main="My Graph", sub="(First Test)") > # add labels on x-axix and y-axis > title(xlab="Speed", ylab="Distance")
Here is what the generated graph looks like:
⇒ R Software Environment - Frequently Asked Questions
2023-03-17, 370🔥, 0💬
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