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Unable to perform assignment because the left and right sides have a different number of elements.

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Theo Ward
Theo Ward 2023-12-8
回答： Walter Roberson 2023-12-8
I keep getting the error 'Unable to perform assignment because the left and right sides have a different number of elements.' whenever I try to run it, and I'm not quite sure why as according to the workspace, all elements have the same size/value. Any help fixing this would be appreciated!
h = 0.08;
t = 0:h:2;
x = zeros(size(t));
x(1) = 2/25;
n = numel(x);
f = 5*(x-t.^2);
sz_x = size(x);
sz_f = size(f);
for i = 1:n-1
f = 5*(x-t.^2);
x(i+1) = x(i) + h*f;
end
  1 个评论
Dyuman Joshi
Dyuman Joshi 2023-12-8
f is a vector, thus the RHS of the assignment is a vector, and you are trying to fit a vector into a scalar placeholder, which results in the error you get.
x(i+1) = x(i) + h*f;

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回答（1 个）

Walter Roberson
Walter Roberson 2023-12-8
Ran in:
This version of the code does more work than is necessary, but has the minimal change needed to prevent the particular error you were encountering.
h = 0.08;
t = 0:h:2;
x = zeros(size(t));
x(1) = 2/25;
n = numel(x);
f = 5*(x-t.^2);
sz_x = size(x);
sz_f = size(f);
for i = 1:n-1
f = 5*(x-t.^2);
x(i+1) = x(i) + h*f(i);
end
plot(t, x)

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