compare two matrices to get index matrix

i need a code for comparing two matrix

which have the same length(a) = length(b)

a = [01 05 09 06 07 08 04 10 12 05]

b = [02 05 07 04 10 05 10 13 06 05]

to extract 3 index matrix for 3 cases

if (a >b) result: x = [3 4 6 9]

(a <b) y = [1 5 7 8]

(a =b) z = [2 10]

Answer 1

[Walter Roberson]

find(a>b)
find(a<b)
find(a==b)