How to do random arrangement of data like this using a FOR Loop?

Please consider my sample code:

 N=256; % some constant
 data=randsrc(1,N,[1:.01:5]); % data points
 b=[1,2,4,8,16] % no. of blocks where a b represents no. of rows in output matrix

How to divide my data(1x256)into blocks b=[1,2,4,8,16] in a Random Grouping of data indices like this using a FOR Loop:

For a single output matrix following are the conditions:

1. Each row randomly picks up the data point excluding the data points picked up by other Row
2. and rest of the indices in a row have a zero.
3. order of data indices picked up does not matter

Output Matrix are as follows:

 out1= 1xN = same as data(1x256)(no division into blocks)

 out2= is a 2xN matrix
       row 1 picks up random 128 data points (in any order)
       row 2 picks rest of 128 data points (excluding data points of row 1)
       and places them at a different index (other than that of row 1)
       And rest of indices are zero in any row.

Similarly,

 out4=  is a 4xN matrix
        Each row uniquely picks random 64 data points

 out8=  is 8xN matrix
        and Each row picks 32 random data points 

 out16= is a 16xN matrix
        and Each row picks 16 random data points.

How to do this using a FOR Loop running for b=[1,2,4,8,16] ?