how to select specific values in a matrix

Question

Shani 2013-11-18

0
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https://ww2.mathworks.cn/matlabcentral/answers/106618-how-to-select-specific-values-in-a-matrix

评论： Image Analyst 2013-11-23

Hi I will give an example, I have a 10X10 matrix, I want to select the 4th value in the first row, the 7th value in the 4th row and value 5 onwards on the 3rd row, and selecting multiple values from different rows. If anyone can help me. Thanks

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Image Analyst 2013-11-23

Here is what Shani asked, so that it will still be here when she deletes this question:

Hi I will give an example, I have a 10X10 matrix, I want to select the 4th value in the first row, the 7th value in the 4th row and value 5 onwards on the 3rd row, and selecting multiple values from different rows. If anyone can help me. Thanks

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Answer 1

Doug Hull 2013-11-18

6
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https://ww2.mathworks.cn/matlabcentral/answers/106618-how-to-select-specific-values-in-a-matrix#answer_115613

在 MATLAB Online 中打开

>> a = magic(10)
a =
      92    99     1     8    15    67    74    51    58    40
      98    80     7    14    16    73    55    57    64    41
       4    81    88    20    22    54    56    63    70    47
      85    87    19    21     3    60    62    69    71    28
      86    93    25     2     9    61    68    75    52    34
      17    24    76    83    90    42    49    26    33    65
      23     5    82    89    91    48    30    32    39    66
      79     6    13    95    97    29    31    38    45    72
      10    12    94    96    78    35    37    44    46    53
      11    18   100    77    84    36    43    50    27    59
>> a(1,4)
ans =
       8
>> a(4,7)
ans =
      62
>> a(3,5:end)
ans =
      22    54    56    63    70    47