问题

我想要将两个向量求和，方式如下：

A = seq(10, 30, 10)
B = seq(1, 6, 1)
C = c()

for (i in B) {
for (j in A)
C = c(j + i)
}

C将是一个包含以下所有结果的向量：

for (i in B) {
for (j in A)
print(j + i)
}

我对矩阵不感兴趣。我可能该怎么做呢？谢谢。

英文:

I would like to sum up two vectors, in a way that:

A = seq(10, 30, 10)
B = seq(1, 6, 1)
C = c()

for (i in B) {
  for (j in A)
  C = c(j + i)
}

C would be a vector with all results appearing from:

for (i in B) {
  for (j in A)
  print(j + i)
}

I am not interested in a matrix for this. What could I possibly do?
Thanks

答案1

得分: 1

You can use outer in this case.

c(outer(A, B, `+`))
[1] 11 21 31 12 22 32 13 23 33 14 24 34 15 25 35 16 26 36

If you really need a for loop, we can use the approach provided by @Feel free in the comment:

for (i in B) {
  for (j in A)
    C = append(C, j + i)
}

C
[1] 11 21 31 12 22 32 13 23 33 14 24 34 15 25 35 16 26 36

英文:

You can use outer in this case.

c(outer(A, B, `+`))
[1] 11 21 31 12 22 32 13 23 33 14 24 34 15 25 35 16 26 36

<hr>

If you really need a for loop, we can use the approach provided by @Feel free in the comment:

for (i in B) {
  for (j in A)
    C = append(C, j + i)
}

C
[1] 11 21 31 12 22 32 13 23 33 14 24 34 15 25 35 16 26 36

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