# Addition of Lines to a Plot in R Programming – lines() Function

`lines()` function in R Language is used to add lines of different types, color and width to an existing plot.

Syntax: lines(x, y, col, lwd, lty)

Parameters:
x, y: Vector of coordinates
col: Color of line
lwd: Width of line
lty: Type of line

Sample Scatter plot:

 `# R program to create a scatter plot ` `  `  `# Creating coordinate vectors ` `x <``-` `c(``1.3``, ``3.5``, ``1.4``, ``-``3.1``, ``5.7``, ``2.4``, ``3.3``, ``2.5``, ``2.3``, ``1.9``, ``1.8``, ``2.3``) ` `y <``-` `c(``2.5``, ``5.8``, ``2.1``, ``-``3``, ``12``, ``5``, ``6.2``, ``4.8``, ``4.2``, ``3.5``, ``3.7``, ``5.2``) ` `  `  `# Plotting the graph ` `plot(x, y, cex ``=` `1``, pch ``=` `3``, xlab ``=``"x"``, ylab ``=``"y"``, col ``=``"black"``) ` Example 1:

 `# R program to add lines into plots ` `  `  `# Creating coordinate vectors ` `x <``-` `c(``1.3``, ``3.5``, ``1.4``, ``-``3.1``, ``5.7``, ``2.4``, ``3.3``, ``2.5``, ``2.3``, ``1.9``, ``1.8``, ``2.3``) ` `y <``-` `c(``2.5``, ``5.8``, ``2.1``, ``-``3``, ``12``, ``5``, ``6.2``, ``4.8``, ``4.2``, ``3.5``, ``3.7``, ``5.2``) ` `  `  `# Plotting the graph ` `plot(x, y, cex ``=` `1``, pch ``=` `3``, xlab ``=``"x"``, ylab ``=``"y"``, col ``=``"black"``) ` ` `  `# Creating coordinate vectors ` `x2 <``-` `c(``4.3``, ``1.2``, ``-``2.5``, ``-``0.4``) ` `y2 <``-` `c(``3.5``, ``4.6``, ``2.5``, ``3.2``) ` ` `  `# Plotting a line ` `lines(x2, y2, col ``=` `"red"``, lwd ``=` `2``, lty ``=` `1``) `

Output: Example 2:

 `# R program to add lines into plots ` `  `  `# Creating coordinate vectors ` `x <``-` `c(``1.3``, ``3.5``, ``1.4``, ``-``3.1``, ``5.7``, ``2.4``, ``3.3``, ``2.5``, ``2.3``, ``1.9``, ``1.8``, ``2.3``) ` `y <``-` `c(``2.5``, ``5.8``, ``2.1``, ``-``3``, ``12``, ``5``, ``6.2``, ``4.8``, ``4.2``, ``3.5``, ``3.7``, ``5.2``) ` `  `  `# Plotting the graph ` `plot(x, y, cex ``=` `1``, pch ``=` `3``, xlab ``=``"x"``, ylab ``=``"y"``, col ``=``"black"``) ` ` `  `# Creating coordinate vectors ` `x2 <``-` `c(``2``, ``3``, ``4``, ``5``) ` `y2 <``-` `c(``2``, ``3``, ``4``, ``5``) ` ` `  `# Plotting a line ` `lines(x2, y2, col ``=` `"red"``, lwd ``=` `3``, lty ``=` `2``) `

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