overwrite cell array in a loop

the code is given below; parts(day) are calculated using some data which is let say comes out as 3 4 2 for day 1 2 3. complete code is attached in file.. when the value of parts(day) decreses from previous loop, the cell cannot reassign the new value but overwrite on previous and causes extra cell which creates error in reshaping.

for day=1:3
   n = 2;                                                              
  Psub{parts(day}=[];                                                
  for ii=1:(parts(day)*2)/n
      Psub{ii}=process_plan((ii-1)*n+1:ii*n,:);
  end
  P=reshape((cell2mat(Psub)),parts(day)*2,machines);

[Bob Thompson]

I'm a little confused by what you're problem is and would like some more context. Would you mind including more of your code (the whole loop if possible)?

[summyia qamar]

I have provided the complete code..the error is from line 52 to 57

Answer 1

[Stephen23]

clear the cell array before you implicitly create it with that allocation:

clear P
P{4}=[];
...
clear P
P{2}=[]
...

Note that this is not an efficient solution. A much better solution would be to explicitly create the cell array of the right size each time, e.g.:

P = cell(1,4);
...
P = cell(1,2);
...

I recommend that you explicitly create the cell array.

[summyia qamar]

thankyou so much, I was looking for this solution but I was confused how to define cell array. the second solution is best for me.