Nested loop in 3 d matrix

Question

Mohammad Juned 2021-3-12

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/770958-nested-loop-in-3-d-matrix

评论： Mohammad Juned 2021-3-12

I have a matrix of order 3*7

  10     8    22    18    20    30
  5      12   18    15    22    28
  30     32   12    11    16    25

I want to add each element of every to each element of other rows

i.e. a1 a2 a3 a4 a5 a6 a7

c1 c2 c3 c4 c5 c6 c7 b1 b1 . . . . .

c1 c2 c3 c4 c5 c6 c7 b2 b2 . . . . .

c1 c2 c3 c4 c5 c6 c7 b3 b3 . . . . .

c1 c2 c3 c4 c5 c6 c7 b4 b4 . . . . .

c1 c2 c3 c4 c5 c6 c7 b5 b5 . . . . .

c1 c2 c3 c4 c5 c6 c7 b6 b6 . . . . .

c1 c2 c3 c4 c5 c6 c7 b7 b7 . . . . .

How can I do this using for loop ?

2 个评论
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David Hill 2021-3-12

Hard to understand. Show the output you want using a smaller input matrix.

Mohammad Juned 2021-3-12

编辑：Mohammad Juned 2021-3-12

let a a matrix of 3*3

1 2 3

4 5 6

7 8 9

now we add each element such as

1 + { (4+7) (4+8) (4+9)

(5+7) (5+8) (5+9)

(6+7) (6+8) (6+9) }

2+{ (4+7) (4+8) (4+9)

(5+7) (5+8) (5+9)

(6+7) (6+8) (6+9) }

3+{ (4+7) (4+8) (4+9)

(5+7) (5+8) (5+9)

(6+7) (6+8) (6+9) }

since this is a matrix of 3*3 order size therefore we have 3*3*3 i.e.27 elements in it.

for 3*7 we would have 7*7*7 i.e. 343 elements.

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Answer 1

David Hill 2021-3-12

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/770958-nested-loop-in-3-d-matrix#answer_646328

在 MATLAB Online 中打开

m=[12    10     8    22    18    20    30
    10    5      12   18    15    22    28
    13    30     32   12    11    16    25];
b=m(3,:)+m(2,:)';
for k=1:size(m,2)
  M(:,:,k)=m(1,k)+b;
end

9 个评论
显示 7更早的评论隐藏 7更早的评论

David Hill 2021-3-12

在 MATLAB Online 中打开

Works for your examples. If I am not understanding, you will need to explain further.

M(:,:,1) =
  52    54    34    33    38    47
  47    49    29    28    33    42
  54    56    36    35    40    49
  60    62    42    41    46    55
  57    59    39    38    43    52
  64    66    46    45    50    59
  70    72    52    51    56    65
M(:,:,2) =
  50    52    32    31    36    45
  45    47    27    26    31    40
  52    54    34    33    38    47
  58    60    40    39    44    53
  55    57    37    36    41    50
  62    64    44    43    48    57
  68    70    50    49    54    63
M(:,:,3) =
  48    50    30    29    34    43
  43    45    25    24    29    38
  50    52    32    31    36    45
  56    58    38    37    42    51
  53    55    35    34    39    48
  60    62    42    41    46    55
  66    68    48    47    52    61
M(:,:,4) =
  62    64    44    43    48    57
  57    59    39    38    43    52
  64    66    46    45    50    59
  70    72    52    51    56    65
  67    69    49    48    53    62
  74    76    56    55    60    69
  80    82    62    61    66    75
M(:,:,5) =
  58    60    40    39    44    53
  53    55    35    34    39    48
  60    62    42    41    46    55
  66    68    48    47    52    61
  63    65    45    44    49    58
  70    72    52    51    56    65
  76    78    58    57    62    71
M(:,:,6) =
  60    62    42    41    46    55
  55    57    37    36    41    50
  62    64    44    43    48    57
  68    70    50    49    54    63
  65    67    47    46    51    60
  72    74    54    53    58    67
  78    80    60    59    64    73
M(:,:,7) =
  70    72    52    51    56    65
  65    67    47    46    51    60
  72    74    54    53    58    67
  78    80    60    59    64    73
  75    77    57    56    61    70
  82    84    64    63    68    77
  88    90    70    69    74    83