Vectors Must be same length. Do I use Linspace or ?

I am not sure if I am supposed to be using linspace or not to ensure that vectors are the same length.

Vectors must be the same length is the error I cannot figure out. Here is the code(A picture is also provided that looks much more readable)

CODE STARTS BELOW:

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clc

clear

close all

k = input('Enter the value of gain k = '); % (gain k = 9 is given in the que.)

wn = input('Enter the value of natural Frequency wn = '); % (natural frequency wn = 3 is given in the que)

% step response & pole plot for zeta = 3

zeta = 3;

num = [k*wn^2];

den = [1 6*zeta wn^2];

sys = tf(num,den);

%[y,t] = step(sys);

k= 9;

s= 0.1:0.1:2;

w= 3;

tiledlayout(1,2);

ax1 = nexttile;

ax2 = nexttile;

for i = 1:length(s)

y = stepResponse(k, s(i), w);

t = 0:0.05:6;

plot(ax1, t, y)

xlabel (ax1, 'Time (sec)'); ylabel(ax1, 'Amplitude');

title(ax1, 'Step Reponse');

all_roots = getPoles(k, s(i), w);

plot (ax2, all_roots(:, 1), all_roots(:, 2), 'o');

xlabel (ax2, 'Real Part'); ylabel(ax2, 'Imaginary Part');

title(ax2, 'Pole Locations in Complex Plane');

hold(ax2, 'on');

pause(0.25);

end

function y=stepResponse(a, b, c)

y=step(a, b, c);

end

Answer 1

[VBBV]

%if true
  t = linspace(0,6,length(s));%0:0.05:6;

What is size of variable s in workspace ?

[VBBV]

Put the above code line outside of for loop

[Zack Hawkins]

s= 0.1:0.1:2;

That is what s is defined to be. Is that what you are looking for? or the amount of elements in the array in s?

[Zack Hawkins]

I am getting the same error. Although this does point me in the right direction so thank you!

[VBBV]

The variables s and t are not of same size. They don't have same number of elements. Therefore y output of stepresponse is also different

[VBBV]

Inside the loop modify the following lines of code

%if true
y(i) = stepResponse(k, s(i), w); 
plot(ax1,t(1:i),y(1:i))

And change the defintion of variable t to

%f true
t = linspace(0,6,length(s));%0:0.05:6;

[Zack Hawkins]

Error: Unable to perform assignment bc the indices on the left are not compatible with the size of the right side.

Did i place the code in the correct place? (2 pics below showing different placements of the code you provided). I get the same error in both cases.

I also tried doing this placement incase I misunderstood you:

I really appreciate the help. I just had a professor yell at me today for not remembering something he mentioned 11 weeks ago. Although it still isnt working yet, you gave me hope :)

[VBBV]

%f 
y = stepResponse(k, s(i), w);
K(i) = y; 
plot(ax1,t(1:i),K(1:i))

Ok. In that case output of stepresponse is singular value. So, you can try above