是否可以在R中以以下方式将两个向量或矩阵与向量相乘？

Question

A = 1:5
B = 11:15

I know A %*% B would give, AB = [205] ie 1*11+2*12+3*13+4*14+5*15 =205
However, I want AB to be (without going through a loop, if possible) = (1*11)^2+(2*12)^2+(3*13)^2+(4*14)+(5*15)^2=10979

Follow-up: this solves the above problem sum((A*B)^2) as suggested by @Dason and @nicola.

Now what needs to be done in case A is a matrix ie A =matrix(1:10,2,5) After playing around I found this works: rowSums((A %*% diag(B))^2)

Answer 1

尽管没有直接执行操作符/功能的操作，但将一些操作链接到一起很容易，而无需循环就可以得到所需的内容。

sum((A*B)^2)