Example -- Visualizing an FFT as a Movie
This example illustrates the use of movies to visualize the quantity
fft(eye(n)), which is a complex n-by-n matrix whose elements are various powers of the
nth root of unity,
Creating the Movie
Create the movie in a
for loop calling
getframe to capture the graph. Since the
plot command resets the axes properties, call
equal within the loop before
Running the Movie
After generating the movie, you can play it back any number of times. To play it back 30 times, type
You can readily generate and smoothly play back movies with a few dozen frames on most computers. Longer movies require large amounts of primary memory or a very effective virtual memory system.
Movies that Include the Entire Figure
If you want to capture the contents of the entire figure window (for example, to include GUI components in the movie), specify the figure's handle as an argument to the
getframe command. For example, suppose you want to add a slider to indicate the value of
k in the previous example.
In this example, the movie frame contains the entire figure. To play so that it looks like the original figure, make the playback axes fill the figure window.
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