# sol_hw1 - CE 335 Solutions to Homework 1 8) Given the...

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CE 335 Solutions to Homework 1 8) Given the differential equation, the Euler's method numerical approximation is y(t + Δ t) = y(t) + Δ t(3(Q/A)sin 2 (t) - Q/A). Here, the number of time steps to take is n = (t 1 - t 0 )/ Δ t = (10 d)/(0.5 d) = 20. We can write a Matlab script to execute Euler's method and display the result from each step: %set values for parameters in problem Q = 500; %m^3/d A = 1200; %m^2 %step size to use Dt = 0.5; %d %number of steps n = 20; %initial condition t = 0; y = 0; %display the initial condition %cf. Sec. 3.2 for usage of fprintf fprintf(' t(d) y(m)\n'); fprintf('%5.1f %10.3f\n', t, y); %do Euler's method and display the result from each step for i = 1:n y = y + Dt*(3*(Q/A)*(sin(t)^2) - Q/A); t = t + Dt; fprintf('%5.1f %10.3f\n', t, y); end The result is t(d) y(m) 0.0 0.000 0.5 -0.208 1.0 -0.273 1.5 -0.039 2.0 0.375 2.5 0.683 3.0 0.699 3.5 0.503

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4.0 0.371 4.5 0.521 5.0 0.910 5.5 1.276 6.0 1.379 6.5 1.220 7.0 1.040 7.5 1.102 8.0 1.443 8.5 1.847 9.0 2.037 9.5
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## sol_hw1 - CE 335 Solutions to Homework 1 8) Given the...

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