For Loop, Unequal Sizes Help
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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"?
采纳的回答
Ameer Hamza
2020-9-21
编辑：Ameer Hamza
2020-9-21
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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