how get it?

Question

Luca Re 2023-10-7

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2030539-how-get-it

回答： Walter Roberson 2023-10-8

 a=magic(5)
a = 5×5
    17    24     1     8    15
    23     5     7    14    16
     4     6    13    20    22
    10    12    19    21     3
    11    18    25     2     9
 b=[1 3 2 4 5]
b = 1×5
     1     3     2     4     5

i want to get:

in 1 column i want to 1 element
in 2 column i want to 3 element
in 3 column i want to 2 element
in 4 column i want to 4 element
in 5 column i want to 5 element
ans:
 17  6  7  21 9

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Answer 1

Walter Roberson 2023-10-8

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2030539-how-get-it#answer_1328639

在 MATLAB Online 中打开

 a=magic(5)
a = 5×5
    17    24     1     8    15
    23     5     7    14    16
     4     6    13    20    22
    10    12    19    21     3
    11    18    25     2     9
 b=[1 3 2 4 5]
b = 1×5
     1     3     2     4     5
 v = a(sub2ind(size(a), b, 1:size(a,2)))
v = 1×5
    17     6     7    21     9

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Answer 2

Torsten 2023-10-7

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2030539-how-get-it#answer_1328634

编辑：Torsten 2023-10-7

在 MATLAB Online 中打开

a = magic(5)
a = 5×5
    17    24     1     8    15
    23     5     7    14    16
     4     6    13    20    22
    10    12    19    21     3
    11    18    25     2     9
b = [1 3 2 4 5]
b = 1×5
     1     3     2     4     5
v = arrayfun(@(i)a(b(i),i),1:size(a,2))
v = 1×5
    17     6     7    21     9