summation valuse in struct just one dimension

Hello

I have a struct(3*3*3 with fields: bit). in each field I have two values. I want to divide vales of each field by product of summation of values of each field in dimension 3)

for example if

struct(1,1,1).bit=2, 3

struct(1,1,2).bit=4, 5

struct(1,1,3).bit=6, 7

my new sruct values must be for example:

newstruct(1,1,1).bit=2/2+4+6 , 3/3+5+7

newstruct(1,1,2).bit=4/2+4+6 , 5/3+5+7

newstruct(1,1,3).bit=6/2+4+6 , 7/3+5+7

thanks in advance