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--- gibson:teaching:fall-2013:math445:hw3 [2013/10/14 11:02]
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+++ gibson:teaching:fall-2013:math445:hw3 [2013/10/22 07:14] (current)
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 . Produce a contour plot of $f(x,y) = \sin(x^2+y^2)/\sqrt{x^2 + y^2}$
 where //x// and //y// range from -10 to 10. Label the axes.
+----
+**A few more problems, added late 10/14/2013**. You don't have to turn these in, but they are fair game for the exam. I will add more example problems over the next few days.
+. Write an expression that returns the positive elements of a vector v.
+. Write an expression that returns the sum of the positive elements of a vector v.
+. Write an expression that returns the number of positive elements in a vector v.
+** Even more practice problems! Hooray! added 10/22/3013 **
+. Write a function that computes the factorial of an integer n using a ''while'' loop.
+. Write an ''isPrime(n)'' function that returns 1 (true) is n is prime and 0 (false) if n is not prime. Don't worry about making the test efficient or doing it with integer arithmetic.
+. Write a function that returns a vector of all the integer divisors of an integer n. Again, don't worry about efficiency or integer arithmetic.