Function Display As Is

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Marino Kosorcic
Marino Kosorcic 2019-4-27
评论： Christopher Chock 2022-9-15
Hi all,
I wish to display a transfer function in the form that is shown below.
9wmUiBglo4.png
I am having trouble with the 5*(s+15) term, as MATLAB is by default distributing the 5 into the function and displaying 5*(s+75).
I wrote a MATLAB function which prompts the user for input polynomials and displays the output as the ratio of factors and as the ratio of polynomials once the factors are expanded.
function [factors,polynomials] = test(numpoly,denpoly)
%UNTITLED Summary of this function goes here
% Detailed explanation goes here
syms s
numpoly = input('Please enter numerator polynomial as a function of s: ')
denpoly = input('Please enter denominator polynomial as a function of s: ')
factors = (numpoly/denpoly)
polynomials = expand(numpoly)/expand(denpoly)
pretty(factors)
pretty(polynomials)
end
%And the Outputs:
% (5 s + 75) (s + 26) (s + 72)
% ----------------------------
% 2 2
% s (s + 56) (s + 5 s + 30)
%
% 3 2
% 5 s + 565 s + 16710 s + 140400
% ------------------------------------------
% 5 4 3 2
% s + 117 s + 3726 s + 19040 s + 94080 s
  1 个评论
Christopher Chock
Christopher Chock 2022-9-15
This should help!
https://www.mathworks.com/help/control/ug/transfer-functions.html

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回答（1 个）

Image Analyst
Image Analyst 2019-4-27
Maybe try this:
s = linspace(0.1, 10, 1000);
numerator = 5 * (s + 15) .* (s + 26) .* (s + 72);
denominator = s .* (s + 56).^2 .* (s.^2 + 5 * s + 30);
H = numerator ./ denominator;
plot(s, H, 'b.-');
grid on;
xlabel('s', 'FontSize', 20);
ylabel('H', 'FontSize', 20);
0000 Screenshot.png
  1 个评论
Marino Kosorcic
Marino Kosorcic 2019-4-27
Sorry I must clarify. My task is to display the actual mathematical equation in the two forms: As a ratio of factors and as a ratio of polynomials.
The issue that I am having is in displaying the equation as a ratio of factors. Particularly in displaying 5*(s+15) as it is and not as (5*s+75).

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