How to assign the result of a row deletion operation to a new matrix?

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Ecaterina Savenco 2023-1-17

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https://ww2.mathworks.cn/matlabcentral/answers/1895800-how-to-assign-the-result-of-a-row-deletion-operation-to-a-new-matrix

评论： Star Strider 2023-1-17

I have a 10X10 matrix, from which I delete the row 3 applying A(3,:)= [] . I want to save the original matrix and have the new matrix with a deleted row assigned to a new variable C. Now how do I assign this result to a new matrix C?

I do C= A(3,:)=[] but it is obviously wrong.

Thank you!

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Answer 1

Star Strider 2023-1-17

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https://ww2.mathworks.cn/matlabcentral/answers/1895800-how-to-assign-the-result-of-a-row-deletion-operation-to-a-new-matrix#answer_1150620

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I would do something like this —

A = magic(10)                                   % Save Original
A = 10×10
  99     1     8    15    67    74    51    58    40
  80     7    14    16    73    55    57    64    41
  81    88    20    22    54    56    63    70    47
  87    19    21     3    60    62    69    71    28
  93    25     2     9    61    68    75    52    34
  24    76    83    90    42    49    26    33    65
   5    82    89    91    48    30    32    39    66
   6    13    95    97    29    31    38    45    72
  12    94    96    78    35    37    44    46    53
  18   100    77    84    36    43    50    27    59
C = A;                                          % Copy 'A' To 'C'
C(3,:) = []                                     % Delete Row 3 From 'C'
C = 9×10
  99     1     8    15    67    74    51    58    40
  80     7    14    16    73    55    57    64    41
  87    19    21     3    60    62    69    71    28
  93    25     2     9    61    68    75    52    34
  24    76    83    90    42    49    26    33    65
   5    82    89    91    48    30    32    39    66
   6    13    95    97    29    31    38    45    72
  12    94    96    78    35    37    44    46    53
  18   100    77    84    36    43    50    27    59