MATLAB: Blocks in series, Simulink

blocks in seriessimulinktransfer function blocktransport delay

Hello Matlab and Simulink users.

I would like to calculate the number of Transfer Function blocks that better approximate a Transport Delay block.

Of course, I don't want to manually draw all the blocks and try them.

Is there a way to set the number of blocks in series?

Thanks in advance and best regards,

Maria Angela

Best Answer

Also I do not know the science behind what you want to do, but can image you want to try MATLAB commands like "add_block", "add_line" etc. to create a Simulink model by MATLAB code.

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MATLAB: Fibonacci series, while loop

Well, what is important to me is you have made a credible effort, and gotten close. In fact, you did compute Fibonacci sequence elements.

First, you should have preallocated the vector a, which would make MATLAB more efficient.

What would i change in the code you show?

N = 16; % how far out
a = zeros(1,N); % preallocation
a(1) = 1;
a(2) = 1;
for n = 3:N % a for loop is simpler to write than a while loop
  a(n) = a(n-1)+a(n-2);
end

But how about that ratio thing? You cannot use the limit function to compute a limit as you did. Sorry. But the limit is just the ratio of two consecutive numbers from that sequence. So now, you want to see how well those ratios approach the expected limit as N grows larger.

ratio = zeros(1,N-1);
for n = 1:N-1
   ratio(n) = a(n)/a(n+1);
end
format long g
ratio'
ans =
                         1
                         2
                       1.5
          1.66666666666667
                       1.6
                     1.625
          1.61538461538462
          1.61904761904762
          1.61764705882353
          1.61818181818182
          1.61797752808989
          1.61805555555556
          1.61802575107296
          1.61803713527851
          1.61803278688525

What is the expected limit supposed to be? It is approaching that theoretical limit?

MATLAB: Time series, months and sequence

First, you should avoid creating variables names like x1, x2, ..., xn. This thread explains the issues with this approach in detail: https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

Now, if you want to correct this issue by combining all these values in a single array, then you can use eval(). Note that using frequently using eval() in your code is not a very good idea and should be avoided, but you can use it once to fix the initial mistakes. This code shows an example.

x1 = [1 2 3];
x2 = [4 5 6];
x3 = [7 8 9];
x4 = [10 11 12];
x5 = [13 14 15];
x = [];
for i=1:5 % numbers of the x variables
    eval(['x = [x; x' num2str(i) '];']);
end
x = x(:)';

Best Answer

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MATLAB: Fibonacci series, while loop

MATLAB: Time series, months and sequence

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