A line chart is a graph that connects a series of points by drawing line segments between them. These points are ordered in one of their coordinate (usually the x-coordinate) value. Line charts are usually used in identifying the trends in data. The plot() function in R is used to create the line graph. Syntax The basic syntax to create a line chart in R is plot(v,type,col,xlab,ylab) Following is the description of the parameters used v is a vector containing the numeric values. type takes the value "p" to draw only the points, "l" to draw only the lines and "o" to draw both points and lines. xlab is the label for x axis. ylab is the label for y axis. main is the Title of the chart. col is used to give colors to both the points and lines