find a rows in matrix and its position in that matrix ?

datasheet(48*6)size 
%I had a matrix of  size(48*6) and then 
ii = randperm(size(datasheet,1));
k = ones(24,1)*2;
out = mat2cell(datasheet(ii(1:sum(k)),:),k,size(datasheet,2));
%then i select a row from datasheet lets say 4th row 
B=datasheet(4,:);
%now I want to find out the position of that 4th row in "out" matrix.

Answer 1

[Walter Roberson]

 out{ ceil( find(ii  == 4)/2 ) }

[MUKESH KUMAR]

I want to know B position in out matrix, at which rows it exists?

[Walter Roberson]

Row ceil( find(ii == 4)/2 )

[MUKESH KUMAR]

If I have updated K and datasheet values like attached file then I did not find according to this code and I also tried Index/find but did not get

Answer 2

[Andrei Bobrov]

In general case:

[~,ji] = cellfun(@(x)ismember(B,x,'rows'),out,'un',0);

jj_cell = find(cellfun(@(x)x>0,ji));
ii_row_in_cell = ji{jj_cell};