Exam - MY first exam paper

Numerical and Computing Method :- one of the most easy subject in Chemical Engineering programme.

Same as most of the exam paper, this paper also require us to choose 5 question to answer from 6 question and I did choose 5 but with 1 question forgot part of the code-ing. The question answer should look like this :

• function dx = first_differential1a(t,x)
• global a b c
• 
  
• XT1 = x(1);
• XT2 = x(2);
• XT3 = x(3);
• 
  
• dXT1dt = (XT1 / XT2) - 3;
• dXT2dt = 3 * (XT2 / XT3) - 2;
• dXT3dt = 4 * (XT3 / XT1) - 1;
• 
  
• dx=[dXT1dt; dXT2dt; dXT3dt];

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• global a b c
• 
  
• a = 2;
• b = 3;
• c = 4;
• 
  
• xa(1, 1) = 300;
• xa(1, 2) = 300;
• xa(1, 3) = 300;
• 
  
• ta(1) = 0;
• 
  
• (I forgot this part)
• XT1(1) = xa(1, 1);
• XT2(1) = xa(1, 2);
• XT3(1) = xa(1, 3);
• 
  
• tspan = [0 10];
• 
  
• x0=[xa(1, 1); xa(1, 2); xa(1, 3)];
• options = odeset('RelTol', 1e-3, 'AbsTol',1e-4);
• [t, x] = ode23('first_differential1a', tspan, x0, options);
• xa = x;
• XT1 = xa(:, 1);
• XT2 = xa(:, 2);
• XT3 = xa(:, 3);
• 
  
• figure(1)
• subplot(3, 1, 1)
• plot(t, XT1, '-')
• xlabel('time, hr')
• ylabel('temp, K')
• subplot(3, 1, 2)
• plot(t, XT2, '-')
• xlabel('time, hr')
• ylabel('temp, K')
• subplot(3, 1, 3)
• plot(t, XT3, '-')
• xlabel('time, hr')
• ylabel('temp, K')
• 
  
• figure(2)
• plot(t, XT1, '-', t, XT2, '-', t, XT3, '-')
• xlabel('time, hr')
• ylabel('temp, K')

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but with no worry, i sure i will not fail this subject and will not get only credit but pass with a good result ask y... ask y... XD

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the identity of Alrin Lee

ALRIN LEE -WAS- DONE WITH FIRST PAPER!!!