Graphics |
stem3
displays 3-D stem plots extending from the xy-plane. With only one vector argument, MATLAB plots the stems in one row at x = 1
or y = 1
, depending on whether the argument is a column or row vector. stem3
is intended to display data that you cannot visualize in a 2-D view.
Example - 3-D Stem Plot of an FFT
Fast Fourier transforms are calculated at points around the unit circle on the complex plane. So, it is interesting to visualize the plot around the unit circle. Calculating the unit circle
and the magnitude frequency response of a step function
displays the data using a 3-D stem plot, terminating the stems with filled diamond markers.
Label the Graph
Label the graph with the statements
To change the orientation of the view, turn on mouse-based 3-D rotation.
Example -- Combining Stem and Line Plots
Three-dimensional stem plots work well for visualizing discrete functions that do not output a large number of data points. For example, you can use stem3
to visualize the Laplace transform basis function,, for a particular constant value of s
.
Using t
as magnitudes that increase with time, create a spiral with increasing height and draw a curve through the tops of the stems to improve definition.
Label the Graph
Add axes labels, with the statements
Combining Stem Plots with Line Plots | Stairstep Plots |
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