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

Question

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)

Answer 1

     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)