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When you execute the above code, it produces the following result:







































            7.6 lIne charts

            Line charts are usually used to identify trends in data. A line graph is a chart that is used to display information in
            the form of a series of data points. It uses points and lines to represent change over time. Line graphs are created by
            plotting different points on their X and Y coordinates, then connecting them with a line from beginning to end. This
            line graph represents different values as it can move up and down based on the suitable variable.
            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)
            The following is a 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.
            type: the type of graph to create; Possible values are:
                 ✶ type="p": for points (by default)

                 ✶ type="l": for lines.
                 ✶ type="b": for both; points are connected by a line.
                 ✶ type="o": for both ‘overplotted’;

                 ✶ type="h": for ‘histogram’ like vertical lines.
               • xlab is the label for the x axis.
               • ylab is the label for the y axis.
               • main is the Title of the chart.
               • col is used to give colours to both the points and lines.


                                                           Coding for Data Science Visualisation using R-Studio  257
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