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.
Create a cell array out of a struct
Twins in a Window
Reverse the elements of an array
06 - Matrix Equations 1
Is A the inverse of B?
How long do each of the stages of the rocket take to burn?
Solve the set of simultaneous linear equations
Flip the main diagonal of a matrix
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