CODEWITHSUNDEEP
rggplot2
Gaius Augustus
Gaius Augustus

Reputation: 970

R - ggplot2 - plot regions as lines

I have a dataframe with regions and values. Here's a toy example.

Start    End    Value
1        100     2
100      200     3
300      400     2
400      500     1

What I'd like to do is create a plot where each region (in line 1, that is Start=1, End=100) is plotted on the x, and the Value is on the y. And preferably, I'd like to use ggplot2. I have many different applications for this, but they all boil down to this one question.

What I'd end up with is a plot with flat (slope=0) lines for each region. Here's an example of the type of plot if you ignore the points, and just focus on the lines.

Copy number plot

In words, you would have one plot, with (for the toy data) a line from x=1-100 with a y value of 2, then lines (x,y): (100-200, 3)(300-400, 2)(400-500, 1)

Upvotes: 0

Views: 156

Answers (1)

Gregor Thomas
Gregor Thomas

Reputation: 146110

You can use geom_segment to draw line segments. See ?geom_segment for details.

ggplot(df) + 
    geom_segment(aes(x = Start, xend = End, y = Value, yend = Value))

enter image description here

Using this data:

df = structure(list(Start = c(1L, 100L, 300L, 400L), End = c(100L, 
200L, 400L, 500L), Value = c(2L, 3L, 2L, 1L)), .Names = c("Start", 
"End", "Value"), class = "data.frame", row.names = c(NA, -4L))

You should probably check out some introductory ggplot2 resources. There are lots of suggestions in the ggplot2 tag wiki.

Upvotes: 1

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