I'm confused by this problem. It requires the use of diff() and asks for differentiation, but it tests for equality with the input variable...
the author had proposed lots of questions with meaningless test. i despise this behavior
I understood this set of problems. The author wants us to use a function on x and then recover the original x (therefore an identity). However, It would be probably better if the test suite gave us the modified x (with additional necessary parameters) and demanded the original. That goes for all his problems of this kind.
Gareth, my guess is that he is not doing this on purpose, he only needs to improve his test suite. Currently it is very easy to give a phony solution.
For instance a better problem description would be return the ORIGINAL x after differentiating it.
Find all elements less than 0 or greater than 10 and replace them with NaN
Determine if a Given Number is a Triangle Number
Remove the two elements next to NaN value
Switch matrix to a column vector
find the surface area of a cube
Geometrical meaning of determinant
Non trivial identities - summation
Non trivial identities - reshape
Find the diagonal of the square of side L
Find the treasures in MATLAB Central and discover how the community can help you!
Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select: .
You can also select a web site from the following list:
Select the China site (in Chinese or English) for best site performance. Other MathWorks country sites are not optimized for visits from your location.
Contact your local office