简述
下表描述了向量和矩阵乘法函数：
| 功能 |
描述 |
| dot_product(vector_a, vector_b) |
此函数返回两个输入向量的标量积，它们必须具有相同的长度。 |
| matmul (matrix_a, matrix_b) |
它返回两个矩阵的矩阵乘积，必须一致，即具有像 (m, k) 和 (k, n) 这样的维度 |
Example
以下示例演示了点积：
program arrayDotProduct
real, dimension(5) :: a, b
integer:: i, asize, bsize
asize = size(a)
bsize = size(b)
do i = 1, asize
a(i) = i
end do
do i = 1, bsize
b(i) = i*2
end do
do i = 1, asize
Print *, a(i)
end do
do i = 1, bsize
Print *, b(i)
end do
Print*, 'Vector Multiplication: Dot Product:'
Print*, dot_product(a, b)
end program arrayDotProduct
当上面的代码被编译并执行时，它会产生以下结果：
1.00000000
2.00000000
3.00000000
4.00000000
5.00000000
2.00000000
4.00000000
6.00000000
8.00000000
10.0000000
Vector Multiplication: Dot Product:
110.000000
Example
以下示例演示了矩阵乘法：
program matMulProduct
integer, dimension(3,3) :: a, b, c
integer :: i, j
do i = 1, 3
do j = 1, 3
a(i, j) = i+j
end do
end do
print *, 'Matrix Multiplication: A Matrix'
do i = 1, 3
do j = 1, 3
print*, a(i, j)
end do
end do
do i = 1, 3
do j = 1, 3
b(i, j) = i*j
end do
end do
Print*, 'Matrix Multiplication: B Matrix'
do i = 1, 3
do j = 1, 3
print*, b(i, j)
end do
end do
c = matmul(a, b)
Print*, 'Matrix Multiplication: Result Matrix'
do i = 1, 3
do j = 1, 3
print*, c(i, j)
end do
end do
end program matMulProduct
当上面的代码被编译并执行时，它会产生以下结果：
Matrix Multiplication: A Matrix
2
3
4
3
4
5
4
5
6
Matrix Multiplication: B Matrix
1
2
3
2
4
6
3
6
9
Matrix Multiplication: Result Matrix
20
40
60
26
52
78
32
64
96
