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

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Sevil Cansu Yildirim
回答： Sevil Cansu Yildirim 2019-3-22
Hello,
farfieldvelocity = [-100:.01:100] % velocity est.
lockingdepth = [-100:.01:100] % locking depth est.
for i = 1:length(lockingdepth);
for j = 1:length(farfieldvelocity);
v_e_est = (farfieldvelocity(j)./ pi).* atan(dist./lockingdepth(i));
e = v_est - v_e;
CF(j,i) = e'*e;
end
end
Here I always get the error "Unable to perform assignment because the indices on the left side are not compatible with the size of the right side." for the line CF(j,i) = e'*e

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回答（2 个）

James Tursa
James Tursa 2019-3-22
What is size(dist) and size(v_e)? If these are row vectors, then maybe you need to do e*e' instead to get a scalar result.
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James Tursa
James Tursa 2019-3-22
Sorry I misread your variables. What is size(v_est)? And what is the variable v_e_est supposed to be used for? Is this what was meant:
e = v_e_est.' - v_e; % make e a column vector

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Sevil Cansu Yildirim
for i = 1:length(lockingdepth);
for j = 1:length(farfieldvelocity);
v_e_est = (farfieldvelocity(j)./ pi).* atan(dist./lockingdepth(i));
e = v_e_est - v_e;
CF(j,i) = e.*e';
end
end
I am sorry.
Here, e is the error whic is the difference between v_e_est (v_e estimated) and (v_e observed).
cf is the cross function, which minimize the error. (e'*e is for that, leat squares method)

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