Your assignment is to submit electronically a MATLAB m-file (also known as a script) that
accomplishes the tasks below. To submit your notebook, go to “Computing Projects and
Materials” at the BB site and click on “Second computing project”.
A demo m-file is provided for this project. It is called “MTH 243 first computing project” and is
found at the same BB area as this project itself. It is recommended that you complete this project
by launching this demo m-file, modifying it as needed, and saving the result as your own. The
output of the demo is two plots (in separate windows) of a) the graph, and b) the curvature t
for the given vector-valued function r t . Actually the demo file performs this for two separate
curves, namely 2 3 r t t, t , t , 0 t 1 and r t 2sint, t,3cost , 0 t 4 .
Your first step should be to launch the demo and execute
each example. (The %% symbol is the standard way to
divide an m-file into separate sections; whichever
section your cursor is in is the “active” section, and then
the “Run Section” command shown (or simply Ctrl-
Enter) executes the code in that section.)
Unfortunately MATLAB makes the two plots exactly
the same size and puts them in exactly the same place on your screen, so it looks as though you
only got one graph; in reality you have to use your mouse to slide the top graph away from the
bottom one. Having done so, use your mouse to rotate the graph of r t in 3D, and stop to think
about the curvature graph; does the graph of r t actually look more curved, or less curved,
where the graph of t claims that it is?
What your m-file needs to do is produce a graph of r t , and of t , for each of the following
curves. In each case you will simply modify the code provided in the demo to produce the
graphs you want. You’ll need to revise not only the definitions of r t and of its domain, but
also the viewing window for the graph of r t . Use %% as in the demo to divide your m-file into
sections, with appropriate labeling.
1. r t sint, t,cost , 0 t 4 . (This is a simplified version of one of the examples; is
the graph of t surprising?)
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