Error using for loop to delete empty cell array elements

Question

Jaya 2021-10-31

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1575693-error-using-for-loop-to-delete-empty-cell-array-elements

编辑： Jaya 2021-11-15

I want to completely delete the null elements of routes_log cell array. I use the following code.

     temp_routes_log=routes_log
     for i=1:numel(temp_routes_log)
         if (isempty(temp_routes_log{i})==1)
             routes_log(i)=[]
         end
     end
     %routes_log can be like  {0×0 double}  {1×3 double} and I want to 
     % completely remove the {0×0 double} and make routes_log as just {1×3 double}

But I get error in the case when (for e.g.) 5th entry is null in temp_routes_log but as I am deleting the routes_log elements, the routes_log is no more containing 5 elements and it throws an error at

routes_log(i)=[]

I also tried storing the indices i and then deleting those routes_log elements directly but I some other error was coming. Please guide on how can I achieve the deletion.

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Answer 1

per isakson 2021-10-31

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1575693-error-using-for-loop-to-delete-empty-cell-array-elements#answer_820618

编辑：per isakson 2021-10-31

在 MATLAB Online 中打开

Replace

for i=1:numel(temp_routes_log)

by

for i = numel(temp_routes_log) : -1 : 1 % loop from last to first element

OR if routes_log is large and speed becomes an issue

to_be_deleted = false(1,numel(routes_log))
for i=1:numel(temp_routes_log)
    if isempty(temp_routes_log{i})
        to_be_deleted(i) = true;
    end
end
routes_log(to_be_deleted) = [];