How can i reshape the code as below

k=[dec2hex(floor(rand * 2 ^ 96),24),dec2hex(floor(rand * 2 ^ 96),24), dec2hex(floor(rand * 2^ 64),16)];
%k generates random 64 characters
%k  = 0924668B8FB8700000000000D96089C6C815880000000000EF1A2E75CDB28000
w=reshape(k,4,[ ]);
%w  gives 4x16 char array
   % '068700D8C800E2C8'
    %'96F000998800FED0'
    %'28B0006C100017B0'
    %'4B8000065000A520'

how can I group 2 characters as one element and make w a 4x8 matrix like

09 8F ....................

24 B8 .....................

66 .........................

8B ...........................

[Image Analyst]

What is "key"?

[Kaavya N]

sorry its k

Answer 1

[DGM]

Try this:

k = '0924668B8FB8700000000000D96089C6C815880000000000EF1A2E75CDB28000'

wo = reshape(k(1:2:end),4,[]);
we = reshape(k(2:2:end),4,[]);
w = reshape([wo; we],4,[])

gives

w =
  4×16 char array
    '098F00D9C800EFCD'
    '24B8006015001AB2'
    '6670008988002E80'
    '8B0000C600007500'

If you need literal spaces in between each byte, that can be done instead:

wo = reshape(k(1:2:end),4,[]);
we = reshape(k(2:2:end),4,[]);
ws = repmat(' ',[4 8]);
w = reshape([wo; we; ws],4,[])

gives

w =
  4×24 char array
    '09 8F 00 D9 C8 00 EF CD '
    '24 B8 00 60 15 00 1A B2 '
    '66 70 00 89 88 00 2E 80 '
    '8B 00 00 C6 00 00 75 00 '

Note the method of stacking arrays to implement the striping behavior.

[Kaavya N]

Thank you

Answer 2

[Walter Roberson]

compose("%02x", reshape(sscanf(k,'%2x'),4,[]))

This will return a 4 x 8 string array, not a char array. If you want a 4 x 8 array, then you need to use a cell array or a string array, or you need to convert to decimal. The reshape(sscanf(k,'%2x'),4,[]) part is doing the conversion to decimal and re-ordering of values.

[Kaavya N]

Thank you