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====== Differences ====== This shows you the differences between two versions of the page.

--- gibson:teaching:fall-2013:math445:hw3 [2013/10/11 12:24]
gibson
+++ gibson:teaching:fall-2013:math445:hw3 [2013/10/22 07:14] (current)
gibson
@@ Line 51: / Line 51: @@
 y_i = \sum_{j=1}^n A_{ij} x_j
 </latex>
+**A few more problems, added 1/14/2013**
+. Set vector v to the 3rd column of matrix A.
+. Set vector v to the 4th row of matrix A.
+. Set vector v to the first 3 entries in the 7th row of A.
+. Set the 4th row of the 8 x 5 matrix A to (1, 2, 9, 5, 0).
+. Set the 2nd column of the 4 x 3 matrix A to a column vector with entries (3, 0, -1, 5).
+. Zero all the entries in the last column of a matrix A.
+. 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.

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