CODEWITHSUNDEEP
matlabloopsfor-loopcell
user3593525
user3593525

Reputation: 253

loop decrements at run time Matlab

I'm working with cell arrays in a for-loop, However I want to delete a cell at run time at specified condition, and wants the rest of loop iterations to be stable. As when delete any cell from cell arrays the loop condition should be reformatted as the iterations are changed. Any suggestions/possibilities ?

Error:

Index exceeds matrix dimensions.
Error in myCode (line 33)
         if (CellArray2{jj}(ii,:) ~= 0)

My Code:

while ii<=1000
for jj=1:10
if (CellArray2{jj}(ii,:) ~= 0)
CellArray1(jj) = [];
CellArray2(jj) = [];
end
end
end

Upvotes: 0

Views: 86

Answers (1)

Daniel
Daniel

Reputation: 36720

The simplest way to delete elements from a array while indexing over it, is indexing backwards:

for index=numel(MyArray):-1:1
  if (condition)
    MyArray(index)=[]
  end
end

In case you can't iterate backwards in your case, keep track of the elements you want to delete and delete all at once:

toDelete=false(size(MyArray))
for index=1:numel(MyArray)
  if (condition)
    toDelete(index)=true
  end
end
%deletes everything afterwards, using logical indexing
MyArray(toDelete)=[]

I assume the second solution to be faster, because data has only to be shifted once, but I did not test it.

Upvotes: 1

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