sum of individual column values using logical operators

x=[2 1 ;-1 1 ;-1 2 ;1 -1 ;5 -1 ]

ind = x(:,2)<0

C = abs(sum(x(ind)))

ind = x(:,2)>0

D= abs(sum(x(ind)))

here, i need only sum of all rows and second column logical values, while it gives the whole if i remove (:,2) and answer will be not appropriate when i add this one. please guide me

[Walter Roberson]

 CC = abs(sum(x(ind, 2)))

[Usman Mussadiq]

Thanks alot, your contribution means alot to me.