Short code for assigning labels in a large dataset

Hello

Please I have a function which calculate conformal prediction

for instance if k

Z has a size of 1200 12000

rows = 1200

column = 1200

And I want to assign c1, c2 , c3 class to each rows respectively for instance

column 1

a = Z(:,1);

b =repmat(['c1';'c2'; 'c3'],size(a,1)/3,1);

% assuming rows are even if not use some rounding function

T=table ;

T.distance=a ;

T.class=b;

Column 2

a = Z(:,2);

b =repmat(['c1';'c2';'c3'],size(a,1)/3,1);

% assuming rows are even if not use some rounding function

C=table ;

C.distance=a ;

C.class=b;

I want a short code that will enable me do this instead of having to do this for each different 1200 columns

Thank you in advance

Tino