eurler angles

Hi all, can anybody help ?

The euler angles does not work for me...
 
i am using it in this manner :
 
 matrix = gps_get_matrix(gps);
 euler_vector= eulerAngles(matrix);
 phiX =euler_vector[0];
 phiY =euler_vector[1];
 phiZ =euler_vector[2];
 tilt = (float)Math.sqrt(Math.pow(phiX,2) + Math.pow(phiZ,2));    
 System.out.println("Inclinacion "+tilt+ " Valor X: "+ phiX + " Valor 
Z: "+phiZ);
 
But always including the robot on the floor, Tilt = 0  , phiX -0 , 
phiZ =0 , ... Why ???
 
Thanks....
Gladiator...





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