Difference between two cell arrays

I have two cell arrays one is of 12*21cell and thw other is of 1*21 cell.I when i take their difference matlab gives me then 11*1cell rather it should give me 11*21cell. Can anybody tell me why is it so and whats the solution to this?

this is my code:

>>clc
>>clear all
>>for i=1:21
>>a=strcat('\Arranged\',int2str(i));
>>ImgPath = dir(strcat('F:\FLD\FLD_based Face Recognition System_v2',a,'\*.jpg'));%path of folder containing images
>>%sorting=natsortfiles({Path.name});
>>for k=1:length(ImgPath)
  >   fileNames = ImgPath(k).name;    
  >   %S=imread(strcat('F:\FLD\FLD_based Face Recognition System_v2',a,'\',int2str(k),'.jpg')); 
   >   I{k,i}=fileNames; 
>>end
>>end
>>for j=1:length(I)
>>Test{j}=I{5,j};
>>end
>>[p,q]=setdiff(I,Test);
>>%h=setdiff(I,Test,'rows');

Answer 1

[Walter Roberson]

You are creating cell arrays of strings. setdiff() applied to cell arrays of strings tells you all of the strings that are present in the first parameter but not present in the second parameter. setdiff(A,B) for cell arrays of strings is like

   result = A;                        %start with the first
   result( ismember(A, B) ) = [];     %remove everything present in the second

setdiff() is for set membership.

setdiff() has nothing to do with telling you whether one set of named files is somehow similar to a different set of named files.

[sumair shahid]

i am getting my answer but still it is not according to my need.i need answer in multiple rows like (for 5*3cell and 1*3cell)the answer should be 4*3 but ismember gives answer in 1*12 cell.can you please tell me how to solve this?

[Walter Roberson]

No, I cannot tell you how to solve that. Your expectation of what setdiff does appears to be incorrect.