4.8
4.9
4.7

# MAT 581 Matlab Test 1

1. (5 points) Define f (x) = sin(x) + cos(x) and
n x2k+1[0, 2 ].
2. (5 points) Write a Matlab script that plots a closed curve
(px(t), py(t)), 0 t 1
that passes through the points (0, 0), (0, 3), and (4, 0). The functions px and py should
be cubic polynomials. The plot should be based on one hundred evaluations of px and
py.
3. (5 points) For n = 5, 10, and 15, find the Newton interpolating polynomial pn for the
function f(x) = 1/(1 + x2) on the interval [ 5, 5]. Use equally spaced nodes. In each
case, compute f(x) pn(x) for 30 equally spaced points in [ 5, 5] in order to see the
divergence of pn from f.
4. (5 points) Let h be a small number. The derivative of a function f at x0 can be
approximated by a forward divided difference
f (x0) f(x0 + h) f(x0)
h
and by central divided difference
f (x0) f(x0 +h) f(x0 h).
2h
For the function f(x) = sin(x), plot the error when these approximations are used to
estimate f (1) = cos(1) for h = 10 1, 10 2, . . . , 10 16. Repeat with x0 = 1 + 106 . Use
loglog for each of the four plots and display them all in the same window using subplot.
Be sure to title each plot and label the axes appropriately. Your script should not have
any loops.

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