Test 2 - Python Edition
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1 'XNH8QLYHUVLW\ (GPXQG73UDWW-U6FKRRORI(QJLQHHULQJ EGR 13L Spring 218 Test 2 - Python Edition Shaundra B. Daily & Michael R. Gustafson II Name (please print): NetID (please print): In keeping with the Community Standard, I have neither provided nor received any assistance on this test. I understand if it is later determined that I gave or received assistance, I will be brought before the Undergraduate Conduct Board and, if found responsible for academic dishonesty or academic contempt, fail the class. I also understand that I am not allowed to speak to anyone ecept the instructor about any aspect of this test until the instructor announces it is allowed. I understand if it is later determined that I did speak to another person about the test before the instructor said it was allowed, I will be brought before the Undergraduate Conduct Board and, if found responsible for academic dishonesty or academic contempt, fail the class. Signature: Notes You will be turning in each problem in a separate pile. Most of these problems will require working on additional pieces of paper - Make sure that you do not put work for more than any one problem on any one piece of paper. For this test, you will be turning in four different sets of work. Again, Please do not work on multiple problems on the same sheet of paper. Also - please do not put work for one problem on the back of another problem. Be sure your name and NetID show up on every page of the test. If you are including work on etra sheets of paper, put your name and NetID on each and be sure to staple them to the appropriate problem. Problems without names will incur at least a 25% penalty for the problem. Work must be down in dark ink and on only one side of the page. This first page should have your name, NetID, and signature on it. It should be stapled on top of and turned in with your submission for Problem I. Every other pile should have your test page on top followed by any previously blank paper used for that problem. You will not need and can not use a calculator on this test. For hand calculations you will instead show the set-up of the calculation you need to perform but will not reduce it. You can leave powers, roots, products, sums, differences, and quotients unevaluated - for eample, (3)(2) + (8)(11) (6)(24) A = (8) 2 (4) 2 + (2) 2 (7) 2 should be left just like that. You will be asked to write several lines of code on this test. Make sure what you write is code and not mathematics. Be very careful with any symbols you use. You do not need to put the honor code statement in your codes. The honor code statement on this page and your NetID on each problem stands in for that.
2 Problem I: [2 pts.] The Basics (1) Assume that someone has already run the following code: 1 T = np.array([[1, 2],[3, 4]]) 2 U = np.array([[-5, 6],[7, -8]]) which has created the following matrices: [ ] 1 2 T = 3 4 U = [ ] For each of the following sections, determine the resulting matri or matrices created by Python. Put your answers near the block of code from which they came and be sure to indicate which matri is which; your work can go on a separate sheet that you will staple to this page. Your answers can look like Python output or like mathematical epressions. (a) A = T**2 (f) F = (-1<U) & (U<) (b) B = T@T (g) G = U>T (c) C = T*U (h) H = np.where(u<) (d) D = T@U (i) I = T[np.where(U<)] (e) E = np.mean(t) (j) J = np.block([[t], [U]]) (2) Determine the values of the matrices K, L, M, and N when the following loop is finished 1 K=; L=[]; M=; N=np.ones(6) 2 for K in np.arange(1, 6, 2): 3 L += [K]; 4 M = M+K; 5 N[K] = K;
3 Problem II: [3 pts.] Roots and Etrema (1) This part of the problem refers to: f() = e + e + 5cos(2) The function and the sign of the function are presented on the net page which should be turned in with this problem. Assuming the following code is already in place: 1 f = lambda : np.ep()+np.ep(-)-+5*np.cos(2*) (a) Determine the location of the two roots of f(). At the end of your code, the location of the left root should be stored in RootLeft and the location of the right root should be stored in RootRight. (b) Determine the value and location of the overall minimum value of f(). At the end of your code, the value should be stored in MinVal1 and the location should be stored in MinLoc1. (c) Determine the value and location of the local minimum value of f() when <. At the end of your code, the value should be stored in MinVal2 and the location should be stored in MinLoc2. (d) Determine the value and location of the local maimum value of f() when 1 < < 1. At the end of your code, the value should be stored in MaVal and the location should be stored in MaLoc. (e) Determine the two values of where f() = 1. At the end of your code, these values should be stored in f11 and f12. (f) Write the code that produces the top figure on the net page. Note that 1 points were used. (2) This part of the problem refers to: g(,y) = cos() sin(y) 2 + y The function and the contour plot of the function are presented on the net page which should be turned in with this problem. Assuming the following code is already in place: 1 g = lambda,y: np.cos()*np.sin(y)/(**2+y**2+1) (a) Determine the value and location of the overall minimum value of g(,y). At the end of your code, the value should be stored in gmin and the and y coordinates should be stored in gmin and ygmin, respectively. (b) Determine the value and location of the overall maimum value of g(,y). At the end of your code, the value should be stored in gma and the and y coordinates should be stored in gma and gma, respectively. (c) Read this carefully: determine the value and y coordinate of the minimum value of g(,y) when is -3. At the end of your code, the value should be stored in ghmm and the y coordinate should be stored in yhmm. (d) Write the code that produced the bottom left plot of g(,y). Note that 3 points were used in each direction and that the copper color map was used.
4 2 f() sign(f()) g(,y) y y
5 Problem III: [3 pts.] Linear Algebra (1) Given the following epression: [ ] [ ] a y = [ ] 5 6 where a is some known, but variable, value and and y represent your unknowns: (a) Find an epression for the determinant of the coefficient matri - that is, a (b) Find an epression for the inverse of the coefficient matri - that is, ([ ]) a (c) Are there values of a for which there is no solution to this problem? If not, state why you believe that. If so, state what value or values of a mean there is no solution. (d) For a particular value of a, the condition number of the system is given as 1 5. If the measurements for the system were taken with 8 significant figures, what does this condition number mean about the accuracy of the solution? (e) Clearly use linear algebra to solve for and y as functions of a. (2) Given the electric circuit below: R 1 R 3 v s + v a R 2 v b R where R 1 through R 3 are resistors with set values, v s is a known voltage source with a set value, R is a variable resistor (called a potentiometer), and v 1 and v 2 are unknown voltages, a student taking a class requiring the ability to solve for circuits has come up with the following equations: v a v s R 1 + v a + v a v b = R 2 R 3 v b v a + v b = R 3 R (a) Assuming that the values of v 1 and v 2 are unknown, re-write the equations above in linear algebra form; that is, fill in the following: v a v b = (b) Now assume that R 1 =1 Ω, R 2 =2 Ω, R 3 =3 Ω, and v s =1 V. The potentiometer R can have values ranging from Ω to 5 Ω. Write code that will clearly use linear algebra techniques to solve for the voltages v a and v b as functions of R for 5 values of R linearly spaced across the possible range of values, then write code to make a graph containing curves for both v a and v b as a function of R. Be sure to include appropriate ais labels, a title, a grid, and a legend. v a should be plotted as a solid red line and v b should be plotted as a dashed blue line.
6 Problem IV: [2 pts.] Stats and Fits You are given a data file called MyInfo.dat containing eleven pairs of independent (left) and dependent (right) values. For eample, the file might look like: Write a program called FitRand that performs the following tasks: (1) Loads the data. (2) Calculates and displays the sum of the squares of the data residuals. (3) Efficiently calculates the sums of the squares of the estimate residuals and the coefficients of determination for polynomial fits of order 1 through 6 and displays them in an aligned table (see below) where decimal values are in eponential format with four significant digits. (4) Determines the lowest order of those si fits to have a coefficient of determination at or above.95 and displays that order. If none of the fits has a coefficient of determination of at least.95, state, Fit order is higher than 6. Here are two eample runs: 1 St is 1.29e+1 2 Order Sr r e+ 3.6e e+ 6.48e e e e e e e e e-1 9 Fit order is likely: 3 1 St is 3.49e+1 2 Order Sr r e e e e e e e e e e e+ 7.74e-1 9 Fit order is higher than 6
Test 1 - Python Edition
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