MATLAB: Matrix question

matrix

Q =
    10    20    30    40    50    60    70
     8     9    10    11    12    13    14
    33    30    27    24    21    18    15
    28    35    42    49    56    63    70
    36    45    54    63    72    81    90
    -1    -2    -3    -4    -5    -6    -7
    64    69    74    79    84    89    94
required to find:
T=
64 79 94
28 49 70
10 40 70
I used syntax Q([7:21:49; 4:21:49; 16:6:49;])
but it doesn't work. I can only get
64 79 94
28 49 70
using Q([7:21:49; 4:21:49]) and it doesn't accept Q([7:21:49; 4:21:49; 16:6:49;])… any ideas?

Best Answer

Q =[10    20    30    40    50    60    70
     8     9    10    11    12    13    14
    33    30    27    24    21    18    15
    28    35    42    49    56    63    70
    36    45    54    63    72    81    90
    -1    -2    -3    -4    -5    -6    -7
    64    69    74    79    84    89    94]
Q(7:-3:1,1:3:7)
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