Trim Matrix and find the min-max value the reshaped matrix

Question

Lila wagou 2016-3-22

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评论： Lila wagou 2016-3-22

Dear All; For a given Matrix (n : column, m : row) I want to trim [the 2, the 4 the 6 : paire column number] and find the index of min-max value in the reshaped (new) matrix, for example

    A =
        1    4    7    10
        2    5    8    11
        3    6    9    12

I trim the the 2 and the 4 column (keep the impair number ones)

B =
    1    7
    2    8
    3    9
Min_value = 1 (index Column =1 row = 1)
Max_value = 9 (index Column =2 row = 3)

Or I trim the the 1 and the 3 column (keep the pair number ones)

C =
    4    10
    5    11
    6    12
Min_value = 4 (index Column =1 row = 1)
Max_value = 12 (index Column =2 row = 3)

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Answer 1

Azzi Abdelmalek 2016-3-22

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     a=A(:,1:2:end)
|    b=A(:,2:2:end)
    [ii1,jj1]=min(a)
    [ii2,jj2]=max(a)
    [xx1,yy1]=min(b)
    [xx2,yy2]=max(b)

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Lila wagou 2016-3-22

Thank you Mr Azzi Abdelmalek it work for trim, i cannot understand for the min and the max i want the min and its position (in the new matrix) i want the max and its position (in the new matrix) Thank you again

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Answer 2

Stephen23 2016-3-22

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在 MATLAB Online 中打开

Here is how to get the maximum and its indices (change max to min for the minimum):

>> B = [1,7;2,8;3,9]
B =
     1     7
     2     8
     3     9
>> [max_val,max_idx] = max(B(:));
>> [max_row,max_col] = ind2sub(size(B),max_idx)
max_row =
     3
max_col =
     2
>> max_val
max_val =
     9