Matrix/vector multiplication

I am new to fortran 95. I need help on how to multiply matrix and vectors. I have consulted books and online tutorial but to no avail. Also, is silverfrost FTN95 code different from that of other publishers?

There are intrinsic functions to help with this. Dot_Product will multiply 2 vectors. MATMUL will multiply 2 matrices of rank 2.

You need to understand how to declare the arrays and then use intrinsic functions. As you say you are new to Fortran 95, I am not sure to what detail you require further help. I suggest you google Fortran tutorials and see if you can follow the examples they have.

John

It is difficult to know what is being asked here. Help with the maths or help with code?

MATMUL can be used in 3 ways (using numeric data).

C = MATMUL(A,B)

(1) If A has shape (M,K) and B has shape (K,N), C will have shape (M,N)
(2) If A has shape (K) and B has shape (K,M), C will have shape (M) (3) If A has shape (N, K) and B has shape (K), C will have shape (N)

(1) C(i,j) has the value SUM(A(i,:)*B(:,j) (2) C(j) has the value SUM(A(:)*B(:,j)) (3) C(i) has the value SUM(A(i,:)*B(:))