Graphics |

**Combining Stem Plots with Line Plots**

Sometimes it is useful to display more than one plot simultaneously with a stem plot to show how you arrived at a result. For example, create a linearly spaced vector with 60 elements and define two functions, `a`

and `b`

.

Create a stem plot showing the linear combination of the two functions.

Overlaying `a`

and `b`

as line plots helps visualize the functions. Before plotting the two curves, set `hold`

to `on`

so MATLAB does not clear the stem plot.

Use `legend`

to annotate the graph. The stem and plot handles passed to `legend`

identify which lines to label. Stem plots are composed of two lines; one draws the markers and the other draws the vertical stems. To create the legend, use the first handle returned by `stem`

, which identifies the marker line.

legend_handles = [stem_handles(1);plot_handles]; legend(legend_handles,'a + b','a = sin(x)','b = cos(x)')

Labeling the axes and creating a title finishes the graph.

Two-Dimensional Stem Plots | Three-Dimensional Stem Plots |