Reverse the value in multiple columns

Hello, I have 564*31 matrix, and I have inverse the values in column 6,24,35,and 46. Values in these columns are 1,to 5 and I have reverse them. For example, I need to reverse 1 to 5, 2 to 4, 3 becomes 3, 4 to 2 and 5 to 1 in these column. How can I approach?

Thank you so much!

Answer 1

[James Tursa]

x = your matrix
c = a vector with column numbers to reverse
x(:,c) = 6 - x(:,c);

e.g.,

>> x = randi(5,6,6)  % <-- some sample data
x =
     1     2     2     1     5     3
     4     4     5     3     5     5
     2     4     1     1     1     1
     3     4     5     5     2     2
     1     3     3     1     2     1
     4     1     5     4     5     1
>> c = [1 3 6]  % <-- columns to work on
c =
     1     3     6
>> x(:,c) = 6 - x(:,c)
x =
     5     2     4     1     5     3
     2     4     1     3     5     1
     4     4     5     1     1     5
     3     4     1     5     2     4
     5     3     3     1     2     5
     2     1     1     4     5     5