Test #2 and Project #2

         The result of the second test didn’t reach my expectation. I found some my problems which caused the mistakes in this test. Here is a brief summary.

         First of all, I did not pay enough attention to some details during the learning process. For example, regarding the first question of the test, I knew how each type of the networks is built, but I was not clear about their uniqueness and disadvantages compared to each other.

         Secondly, I did not solve each question carefully. In Part II of the test, I knew how the codes work and what they will produce in DrRacket. However, I did not read over them entirely. I didn’t realize that I actually jumped over several lines when I was writing the test. That’s why I lost 4 marks in part II.

         I will definitely improve my learning quality in class, and have a better review before the final exam. I wish I can do a better job in the final one.

         Moreover, I finished the second project last night. I encountered one problem which took me almost one hour to solve it. When I was adding two check-expects before the lines below,

(define (interpolate-image i1 i2 n)

    (local ; f is defined only inside interpolate-image

    [(define (f c1 c2) (interpolate-color (/ n DENOM) c1 c2))]

(map-images f i1 i2)))

I replaced i1 and i2 by pic: hacker and pic: calendar in my check-expects, but the tests failed. DrRacket told me that all the lists must have same size. I didn’t know where the mistakes were. I tried my best but I still couldn’t make it work. Then I decided to replace pic: hacker and pic: calendar by (circle 5 "solid" "green") and (circle 5 "solid" "blue"). To my surprise, the tests passed. I was glad the check-expects finally worked, but I don’t know why the tests passed exactly even now. I guess the two pictures must have same size so that their color-lists have the same size too. I am not quite sure about that. I think I will check with my TA during my tutorial section.