[試題] 108-1 徐振哲 計算機程式 第二次期中考

[installbtien (IU)]

課程名稱︰計算機程式
課程性質︰化工系必修
課程教師︰徐振哲
開課學院：工學院
開課系所︰化工系
考試日期（年月日）︰2019/11/28
考試時限（分鐘）：忘了

試題 :

Problem 1 (15 points): Make the following array of plots:
┌─────────────────────────┐
│Create the following function:                    │
│z=x*sin(x)exp(-y^2)                               │
│use 3D surface plot with contour, plot the above  │
│function between x=0~2pi and y=-2~2               │
├─────────────────────────┤
│Plot the following points with black circles and  │ 
│y=x^2 with a red solid line for x=0~5             │
│┌──┬──┬──┬──┬──┬──┐            │
││ x  │ 0  │ 1  │ 2  │ 3  │ 4  │            │
│├──┼──┼──┼──┼──┼──┤            │
││ y  │ 1  │2.5 │ 4  │9.5 │ 17 │            │
│└──┴──┴──┴──┴──┴──┘            │
├─────────────────────────┤
│plot y=x^3*exp(x) and y=x*exp(x) on the same plot │
│using solid and dashed lines, respectively,       │
│between -1 and 3.                                 │
└─────────────────────────┘


Problem 2 (15 points): Do the following in ONE*.m file and function
file and properly display results:

(i) (5 points) Ask the user to input a positive integer "m". Find and display
    minimum "n" such that 1*2*3+2*3*4+3*4*5+...+n*(n+1)*(n+2)>m.

(ii) (5 points) Solve the following equation sets:

     x+3y-z=3
     2x-3y+3z=4
     y+z=5

(iii) (5 points) Create the following function, and then plot for x=-1~5

      y=|x| for x<1
      y=exp(x)*sin(x) for 1<=x<3
      y=log(x) for x>=3


Problem 3 (20 points): Do the following using ONE*.m file:

(i) (10 points) Ask the user to input a positive even integer "n" greater
    than 2, if the input number is not a positive even integer, display
    "Invalid input", then ask the user to input it again for up to THREE
    TIMES. For the fourth wrong input, display "bye-bye" then exit the code.

(ii) (10 points) Find show the pair of a and b, such that a and b are both
     prime numbers and a+b=n.


Problem 4 (20 points): Fibonacci series is a series starts from a1=0
and a2=1, and each term equals the sum of the previous two terms,
a_n+2_ = a_n+1_ + a_n_ such that the a1~a7 are 0,1,1,2,3,5,8, respectively.
Answer the following questions (You are NOT allowed to use functions related
to Fibonacci):

(以底線表示下標)

(i) (10 points) Ask the user to input a positive integer m, and display a_m_.

(ii) (10 points) Plot the ratio of a_n+1_/a_n_ vs. n for n=1~200. Also draw
     a horizontal line for y=(1+sqrt5)/2.

     (Note: a_n+1_/a_n_ approaches (1+sqrt5)/2 when n approaches infinite)


Problem 5 (15 points): In ONE*.m file, use the following methods to
find and properly display approximated pi: pi_1, pi_2, pi_3

(i) (5 points) pi_1: Calculate the approximate area of the following curve:
    y=sqrt(1-x^2) between 0and 1 with n=150. You may use either A or B.
    https://i.imgur.com/Mvl0ANI.jpg

(ii) (5 points) Create two arrays AA and BB, each has 1500 elements of random
     number between -1 and 1. C=AA.^2+BB.^2. Use "mask" to calculate
     the fraction of elements in C that are less than 1. Use this fraction
     to calculate pi_2.

(iii) (5 points) Use 20 terms approximation to calculate approximated pi: pi_3
      (you are NOT allowed to type in terms manually.)

      π       1    1    1    1
      ─ = 1 - ─ + ─ - ─ + ─ ......
      4        3    5    7    9


Problem 6 (10 points):  Use "rand" to generate a random positive
integer N below 99999, then create a 1*M array AA with 0, 1, and 2, where AA
represent N as a ternary number (三進位數).
For example, N=5, AA=[1 2]; N=24, AA=[2 2 0]. Properly display AA and N (not
necessarily to be in the same line.)

Note: You are NOT allwed to use ANY Matlab functions for conversion between
binary, decimal, and hexadecimal numbers such as "bi2de", "bin2dec",
"dec2bin", "dec2hex", or "de2bi".


Problem 7 (5 points, Answer on THIS exam sheet): Write down your
comments and suggestionsto this course (for example: course, lecturer,
exams, and teaching assistant.)

--
→ CaCO2: 這樣未來澳洲打工度假根本撈不到錢啊
推 f19890230: 這樣說也沒錯，認同鈣二氧化碳大大
→ CaCO2: 那個，我是碳酸鈣啦ww
→ f19890230: 碳酸鈣是CaCO3喔
→ CaCO2: ...所以我是鈣二氧化碳Orz
推 BadNose: 樓上文組
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※ 編輯: installbtien (140.112.236.34 臺灣), 03/23/2020 13:07:13
推 heypostcard : 老師不是不發回題目嗎 你怎麼全背的XDD
→ installbtien: 原來樓上跟我同一個班 他發回來給我們看的時後我有
→ installbtien: 拍起來