model test
Real[3, 5] Matrix

equation
Matrix={{1,2,7,5,4.3}, {4, 6, 2.5, 90, 66}, {12, 13.333, 6, 9, 25}};
end test;

And if you want to access one value of the matrix it's for example:
a=Matrix[2, 5]   (=66)


Is this what you wanted? What exactly do you mean by "even and odd"?