Implement C=Oper(A,B).
Specially, when "Oper" stands for multiplication, C=AB, where:
C is a m*k matrix, m corresponds to dimension 2 while k corrsponds to dimension 1.
A is a m*n matrix, m corresponds to dimension 2 while n corrsponds to dimension 1.
B is a n*k matrix, n corresponds to dimension 2 while k corrsponds to dimension 1.
Like matlab matrix operation.
Parameters
file mat=
auxiliary input file name
string type=
[mul, add, sub, dotmul] operation type, the default is mul