...

Artificial Intelligence - R Programming Advanced

Back to Course

Lesson Description


Lession - #913 R Line

Line Graphs

A line graph has a line that connects all the points in a diagram.

To create a line, use the 

plot(>
function and add the 
type
parameter with a value of 
"l"
:

Example

plot(1:10, type="l">

Result:

Line Color

The line color is black by default. To change the color, use the 

col
parameter:

Example

plot(1:10, type="l", col="blue">

Result:

Line Width

To change the width of the line, use the 

lwd
parameter (
1
is default, while 
0.5
means 50% smaller, and 
2
means 100% larger>
:

Example

plot(1:10, type="l", lwd=2>

Result:

Line Styles

The line is solid by default. Use the 

lty
parameter with a value from 0 to 6 to specify the line format.

For example, 

lty=3
will display a dotted line instead of a solid line:

Example

plot(1:10, type="l", lwd=5, lty=3>

Result:

Available parameter values for 

lty
:

  • 0 removes the line
    • 

  • 1 displays a solid line
    • 

  • 2 displays a dashed line
    • 

  • 3 displays a dotted line
    • 

  • 4 displays a "dot dashed" line
    • 

  • 5 displays a "long dashed" line
    • 

  • 6 displays a "two dashed" line

Multiple Lines

To display more than one line in a graph, use the 

plot(>
function together with the 
lines(>
function:

Example

line1 <- c(1,2,3,4,5,10>

line2 <- c(2,5,7,8,9,10>


plot(line1, type = "l", col = "blue">

lines(line2, type="l", col = "red">

Result: