Bruce, please check the answers to your test suite. Granted, it has been a while since I took calculus in college, but I'm pretty sure the answers aren't all zero. :-)
Never mind...just noticed you were looking for the error differences, and not the actual values. It's been a while since I took a Reading Comprehension class as well...
This is an "honor system" test suite. For the last case, quad('2*x',0,2) gives 3.9999999999999996, while trapz([0:1/n:2],[0:2/n:4]) gives the exact answer 4 for all values of n from 1 to 100, except n=35, 44, 51, 69, 92, or 100, which all give the same answer as quad.
Tell me the slope
Back to basics 9 - Indexed References
Determine the number of odd integers in a vector
07 - Common functions and indexing 5
Find the nearest integer
Create a square matrix of multiples
Is this matrix orthogonal?
Flip the main diagonal of a matrix
Pythagorean perfect squares: find the square of the hypotenuse and the length of the other side
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