Troubleshooting - A Guide to MATLAB for Beginners and Experienced Users - page 248

5

4

3

2

1

0

− 1

− 2

− 3

− 4

− 5

− 5 − 4 − 3 − 2 − 1 0 1 2 3 4 5

(c)

We note that f (1 , 1) = 0, so the appropriate command to plot the
level curve of f through the point (1, 1) is

[X, Y] = meshgrid(0:0.1:2, 0:0.1:2); contour(X, Y, Y.*log(X)
+ X.*log(Y), [0 0], 'k')

Warning: Log of zero.
Warning: Log of zero.

2

1.8

1.6

1.4

1.2

1

0.8

0.6

0.4

0.2

0

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2

Problem 2
We find the derivatives of the given functions:

syms x r