Bar plots

### 18.1.14 Bar plots

The bar_plot command draws bar plots.

- bar_plot takes M, a matrix, where each row consists of a label followed by one or more values. If the labels are followed by more than one value, then the first row needs to be identifiers.
- bar_plot(M) draws a bar graph with a bar for each label, whose height is given by the corresponding value. If the matrix has more than two columns, then there will be a bar plot for each column of values.

#### Examples

bar_plot([["France",6],["Germany",12],["Switzerland",5]])

bar_plot([[2,"xyz","abc"],["A",2,5],["B",5,6],["C",6,6]])