For Loop, Unequal Sizes Help
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Ryan Griffith
el 21 de Sept. de 2020
Comentada: Ameer Hamza
el 22 de Sept. de 2020
Hello,
I am having trouble with a loop. When I do the calculation using only one iteration it seems to work perfecty, but as soon as I try inputting it as a loop and changing the corresponding values the loop fails. Any ideas or help is greatly appreciated. The first part of the code is just to set it up the problem.
load('boulder.mat')
b_droptime = droptime;
b_t = t;
b_y = y;
b_dydyo = ones(631,186);
b_dydvo = b_t;
b_dydg = 0.5*(b_t.^2);
W = eye(631);
X = zeros(186,3);
for c = 1:186
H = [b_dydyo(:,c), b_dydvo(:,c), b_dydg(:,c)];
Y = b_y(:,c);
X(c,:) = (((H.')*W*H)\((H.')*W*Y));
end
This is the part of the code I am struggling with below
theo_y_B = zeros(631,186);
for up = 1:186
theo_y_B(up) = X(up,1) + X(up,2) * b_t(:,up) + 0.5 * X(up,3) * b_t(:,up).^2;
end
Whereas if I do just
theo_y_B = X(1,1) + X(1,2) * b_t(:,1) + 0.5 * X(1,3) * b_t(:,1).^2;
it works.
What do I not understand about "for loops"?
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Respuesta aceptada
Ameer Hamza
el 21 de Sept. de 2020
Editada: Ameer Hamza
el 21 de Sept. de 2020
Change the line
from
theo_y_B(up) = X(up,1) + X(up,2) * b_t(:,up) + 0.5 * X(up,3) * b_t(:,up).^2;
to
theo_y_B(:, up) = X(up,1) + X(up,2) * b_t(:,up) + 0.5 * X(up,3) * b_t(:,up).^2;
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