C++ :: Accessing A Table By Container

I need a "meaningful" way of accessing a table, the column is representing Err magnitude, and the row is representing Rate magnitude. For each error magnitude and rate magnitude, i define an action magnitude, which is the contains of the table. For example,

Code:
int matrix[10][10];
int Action1 = matrix[0][0];
int Action2 = matrix[0][1];

However, i need a better way of getting matrix[0][0], row and col itself is meaningless. I want to access the table like

"Action magnitude" = matrix["Rate magnitude 1"]["Err magnitude 2"]; using a string instead of int id.

How to easily do this in c++ container?