data analysis - Finding matrices correlation -

i have 2 matrices (a , b) have same rows , cols. want compare them in order find if there row in associated values in matrix less values of same row in matrix b. e.g.

a: [5.5 5.8 5.9; 2.3 2.5 2.7; 9.1 9.2 9.0] b: [5.6 5.3 5.7; 7.8 7.9 7.5; 9.0 9.5 8.9]

and interested in row 2 values less other matrix.