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

Question

Yu 2021-8-20

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https://ww2.mathworks.cn/matlabcentral/answers/1437514-unable-to-perform-assignment-because-the-left-and-right-sides-have-a-different-number-of-elements

评论： Yu 2021-8-21

采纳的回答： Turlough Hughes

在 MATLAB Online 中打开

Hi, I'm trying to do a for loop as following.

It can loop up to 633 times but can't do more and I got the error message as in the title.

I appreciate if you could teach me how to solve this.

load variables
for j = 1:length(r)    
    [content(j)] = vlookup(AC, r(j), 2, 1);
end

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Answer 1

Turlough Hughes 2021-8-20

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https://ww2.mathworks.cn/matlabcentral/answers/1437514-unable-to-perform-assignment-because-the-left-and-right-sides-have-a-different-number-of-elements#answer_771299

编辑：Turlough Hughes 2021-8-20

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Your vlookup is not returning a value when j = 634. You will need a condition to deal with this when it happens.

For example:

load variables
k = 1;                    % loop variable
content = zeros(size(r)); % preallocate
for j = 1:length(r) 
    
    v = vlookup(AC, r(j), 2, 1);
    
    if ~isempty(v)
        content(k) = v;
        k = k+1;        % increment k
    end
end
% remove excess rows that arose due to empty output from vlookup
idel = find(content~=0,1,'last'); 
content(idel+1:end) = [];