CE 93 Midterm 1 2008

# CE 93 Midterm 1 2008 - University of California at Berkeley...

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University of California at Berkeley Department of Civil & Environmental Engineering Structural Engineering Mechanics & Materials Instructor: Armen Der Kiureghian Student name:__________________________ CE 93 -- Engineering Data Analysis First Midterm Examination Thursday, March 6, 2008 9 -10 AM, 3108 Etcheverry Hall Work on all three problems. Write clearly and state any assumptions you make. The exam is closed books and notes. However, you can use one sheet of paper with your own notes. The problems have the following weights: Problem 1 (35 points) ________________________ Problem 2 (35 points) ________________________ Problem 3 (30 points) ________________________ Exam grade (100 points) ______________________

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Student name:__________________________________ 2 Problem 1. (35 points) Carefully examine the Matlab® session shown below. The resulting figures are on the next page. Then respond to the itemized questions listed on the following page. The matrix x used in the analysis has two columns. The first column lists the annual maximum flows in a river and the second column lists the corresponding annual minimum flows, both in units of m 3 /s. >> clear all >> x = load('RiverFlow.dat'); >> whos Name Size Bytes Class data 31x2 496 double array >> min(x) ans = 2220 306 >> max(x) ans = 8850 1157 >> Fmax = x(:,1); >> Fmin = x(:,2); >> c1 = [2000:1000:9000]; >> c2 = [300:100:1200]; >> subplot(1,2,1); normfreq(Fmax,c1) >> subplot(1,2,2); normfreq(Fmin,c2) >> figure >> subplot(1,2,1); boxplot(Fmax) >> subplot(1,2,2); boxplot(Fmin) >> figure >> subplot(1,3,1); qqplot(Fmax,Fmin) >> subplot(1,3,2); qqplot(Fmax) >> subplot(1,3,3); qqplot(Fmin) >> figure >> scatter(Fmax,Fmin) >> mean(x) ans = 1.0e+003 * 5.1732 0.6331 >> cov(x) ans = 1.0e+006 * 3.0628 0.1484 0.1484 0.0417 >> moment(x,3) ans = 1.0e+009 * 1.5751 0.0026 >> prctile(Fmin,[10,50,90]) ans = 350.8000 638.0000 877.0000 >> prctile(Fmax,[10,50,90]) ans = 2992 5130 7412
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CE 93 Midterm 1 2008 - University of California at Berkeley...

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