Calculate a return

Hi,

I am trying to calculate a return based on two arrays, mval and mvalprevday.

When I calculate a return as per the below formula my results return a lot of zeros. So I think Matlab is calculating a return for each possible combination of numbers.

Does anyone know how I can avoid getting many zeros. I basically think if I can tell Matlab to only calculate one result per row (I.e. column 1 in mval array * column 1 in mvalprevday array

 rtn = mval / mvalprevday

rtn =

Columns 1 through 8

         0         0         0         0         0         0         0         0
         0         0         0         0         0         0         0         0
         0         0         0         0         0         0         0         0
         0         0         0         0         0         0         0         0
         0         0         0         0         0         0         0         0
         0         0         0         0         0         0         0         0
         0         0         0         0         0         0         0         0
         0         0         0         0         0         0         0         0
         0         0         0         0         0         0         0         0
         0

Answer 1

[Walter Roberson]

rtn = mval ./ mvalprevday

Notice the period before the /

Answer 2

[Cameron]

Perfect. Thanks!