MATLAB: Add a zero element to the beginning of each existing cell array

cellfun

I have C={[-8;-5],[1;-4;-5;-5;-5],[-3;-5]}

I want to get this result CC={[0;-8;-5],[0;1;-4;-5;-5;-5],[0;-3;-5]}

I use this code, but do not works c = cellfun(@(x)(x(0)==0), a, 'UniformOutput', false);

Best Answer

cellfun(@(v)[0;v],C,'uni',0)

And checking:

>> C = {[-8;-5],[1;-4;-5;-5;-5],[-3;-5]};
>> CC = cellfun(@(v)[0;v],C,'uni',0);
>> CC{:}
ans =
   0
  -8
  -5
ans =
   0
   1
  -4
  -5
  -5
  -5
ans =
   0
  -3
  -5

Related Solutions

MATLAB: Find element in array

Not sure how you get the result, but here is an attempt

Data

E=[1 2;1 5;2 3;2 4;2 5;3 4;4 5;4 7;4 9;5 6;6 11;6 12;6 13; 7 8;7 9;9 10;9 14;10 11;12 13;13 14]
C={[1,2,4,5],[1,2,4,5,6,9,10,11],[1,2,4,5,6,13,13]}

Code

CC = cellfun(@(s) E(all(ismember(E,s),2),:), C, 'unif', 0);

Result:

MATLAB: How to modify a matrix to change the entries >=0 and multiply it by 5 AND to change the entries <0 and add 2 to those entries

Start with "If an entry in B is greater than or equal to zero": You can either run a loop over all elements of B or use "logical indexing":

% Linear indexing:
for k = 1:numel(B)
   if B(k) >= 0
     ...
   end
end

Or two indices for rows and columns:

for r = 1:size(B, 2)
  for c = 1:size(B, 1)
    if B(r, c) >= 0
       ...
    end
  end
end

Or "logical indexing":

index = (B >= 0);
disp(B(index))

Now try to use this to modify B. Use the mentioned terms to search in the documentation and in the internet.

Best Answer

Related Solutions

MATLAB: Find element in array

MATLAB: How to modify a matrix to change the entries >=0 and multiply it by 5 AND to change the entries <0 and add 2 to those entries

Related Question