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p_save Change Size on Every Loop Iteration

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Fabio Taccaliti
Fabio Taccaliti 2020-5-15
评论： Fangjun Jiang 2020-5-15
Hello, I wrote this code in Matlab and it sais that p_save change size on every loop iteration (p_save = [p_save p]), so I would like to improve it.
p_save = [];
syms ps
q = linspace(eps,150,60);
for i = 1 : length(q)
A_qs_flut = ps^2*q(i);
DA = det(A_qs_flut);
characteristic_equation = sym2poly(DA);
p = roots(characteristic_equation);
p_save = [p_save p];
end
I know that I can create an array with the right size and then substitute inside the values.
p_save = ones (4, length(q))
My question is: how can I substitute in a smart and fast way the p values inside the p_save array.
Thanks in advance.

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回答（1 个）

Fangjun Jiang
Fangjun Jiang 2020-5-15
p_save(:,i)=p
  2 个评论
Fabio Taccaliti
Fabio Taccaliti 2020-5-15
Thanks for the answer, if instead I want to substitute for example p just in the first column and DA in the second and so on for other variables in the other columns what should I write?
p_save(:,1)=p
p_save(:,2)=DA
ecc.. ?
Fangjun Jiang
Fangjun Jiang 2020-5-15
Yes. You would need declare p_save = ones (4, 2*length(q))
p_save(:,2*i-1)=p
p_save(:,2*i)=DA

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