View Compilation Error

0_0_24553933_19782.cpp: In function 'mat matPow(mat, ll)':
0_0_24553933_19782.cpp:59:27: error: 'multi' was not declared in this scope
   if (n & 1)R = multi(R, A);
                           ^
0_0_24553933_19782.cpp:61:17: error: 'multi' was not declared in this scope
   A = multi(A, A);
                 ^