Quiz 2 CS151 – Summer 2017 Due: Monday, 6/19/2017, 11 AM Your Name: _________________________________ Grade: ____ /9 pts Directions: Circle all answers that apply. 1. You are given distance values, dist = [10,12,8,6,15,11,12] km and corresponding time values, time = [20,25,32,45,59,75,80] sec. What code finds the time when the minimum distance occurs? a. [m,loc]=min(dist); md=time(m) b. loc=min(dist); md=time(loc) c. [a,b]=min(time); md=time(b) d. loc=min(dist); md=d(loc) e. [a,b]=min(dist); md=time(b) 2. Using the proper Matlab syntax, how would you find the inverse sine of in degrees? a. asin( (16/33) ) b. asind( 16/33*180/pi ) c. asind( 16/33 ) d. asin( 16/33 )*180/pi e. asind( 16/33 )*pi/180 f. arcsind( 16/33 ) 3. If you have a matrix, x = [4 5; 6 8; 9 4] and execute [col, row] = size(x) and len=length(x), the result will be: a. row = 3, col = 2, len = 3 b. row = 2, col = 3, len = 3 c. row = 2, col = 3, len = 2 d. row = 3, col = 2, len = 2 4. To get a 3 column, 5 row matrix of random numbers between -20 and 25, you would use the command: a. y = 45-20*rand(3,5) b. y = -20+45*rand(3,5) c. y = 45*rand(5,3)-20 d. y = (-20+45)*rand(5,3) 5. If you had a row vector V=[ 3,6,7,9,-9,3,9 ]; what would the command, max(V), return? a. max = 9 b. max = 9 9 c. ans = 9 9 d. ans = 9 For the next 2 problems: A = [12,17,-3,6], B = [-5,8,3; -1,2,3; 2,4,-6], C = [22; 17; 4] 6. How would you assign the entire third column of matrix B to X1? a. X1 = B(1-3,3) b. X1 = B(:,3) c. X1 = B(3,3) d. X1 = B([1,3],3) 7. How would you assign the second and third rows and second and third columns of B to X2 (creating the matrix [2 3; 4 -6])? a. X2 = B(2:3,2:end) b. X2 = B(2-end,2-end) c. X2 = B([2:3],[2:3]) d. X2 = B((2,3),(2,3)) e. X2 = B(2:3,5: 6,8: 9)