How to get two adjacent columns in loop

I have 201x1024 matrix with first column holding frequency second column holding real part and third column imaginary part then fourth column real and fifth imaginary and so on till last column only first column has frequency .I wish to convert that real and imaginary part into complex quantity or i with to have matrix of complex quantity.I will need loop to read that columns . i did this but its not working for column = 2:2:cols; subdata = DATA( :,column)+ 1i*DATA(:,column+1);

 end

 for column=2:2:col-1 ;
subdata = DATA( :, column:column+1);
c = complex(subdata (:,1),subdata (:,2));
end

subdata[1:No_rows,1:No_col]= DATA( 1:No_rows, column:column+1); c = complex(subdata (:,1),subdata (:,2)); A=abs(c);

Answer 1

[Azzi Abdelmalek]

a=[0 1 2 3 4 5 6;1 7 8 9 10 11 12;2 13 14 15 16 17 18]
freq=a(:,1)
v1=a(:,2:2:end);
v2=a(:,3:2:end);
v=v1+j*v2

[MATRIX]

thank you Azzi Abdelmalek

Answer 2

[Elias Gule]

You need not use a for loop for this.

rData = DATA(:,2:2:end-1) % Get all the real data col 2,4,6...1022
iData = DATA(:,3:2:end-1)   % Get all the imaginary data col 3,5,7,...1023
cData = complex(rData,iData) % Create A Matrix of complex data

[MATRIX]

Thanks Elias Gule it works