I've been told that the homework was assigned out of the suggested
textbook instead of the mandatory textbook.  I am trying to track down
the confusion about which book is which, but in the meantime, the
homework problems are:


<p>1.  problem Section 2.3, exercise 2.3 (a,b) on page 79, 
Given the vector y = [0, -0.2, 0.4, -0.6, 0.8, -1.0, -1.2, -1.4, 1.6];
write the matlab commands to:
<ul>
<li>a. make the vector z = sin(y);
<li>b. determine the minimum and maximum of all the *negative* values of z.
<li>c. determine the square root of *only* the positive values of z.
</ul>
<p> problem Section 2.5, exercise 2.12 on page 81,
The transformation from spherical to cartesian coordinates (or from
latitude/longitude to 3D position) is:

<p>2. Given a point with latitude phi, longitude theta, on a sphere of
radius b, the cartesian coordinates are:

<center>
x = b sin(phi) cos(theta)<br>
y = b sin(phi) sin(theta)<br>
z = b cos(phi)
</center>
<ul>
<li>a. Make 10 equally spaced values of phi in the range 0 <= phi <= 90<sup>o</sup> 
<li>b. Make 24 equally spaced values of theta in the range 0 <= theta <=
180<sup>o</sup>
<li>c. Use [p,t] = meshgrid(phi,theta) to make arrays of phi, theta
values.
<li>d. compute arrays of x,y,z values using the transformation given
above, and plot using mesh(x,y,z).
</ul>
Turn in a script that performs these tasks for both problems in class.