[英]finding difference of 2 vectors at different place values in r
I have 2 columns let'say A and B and I want to calculate difference between them in such a way that 我有2列,让我们说A和B,我想以这样一种方式计算它们之间的差异
A[i+1] - B[i] for i = 1,2,...n
I have been trying diff function but no luck. 我一直在尝试差异功能,但没有运气。 my data is as follows
我的数据如下
A <- c(25,35,45,50,71,89)
B <- c(15, NA, NA, NA, 21,11)
the output I want is as below 我想要的输出如下
C
- (first value should be left blank)
20
NA
NA
NA
68
I tried the following code 我尝试了以下代码
diff <- diff(A[i+1],B[i], lag=1)
can somebody help ? 有人可以帮忙吗?
You can do like this 你可以这样
A <- c(25,35,45,50,71,89)
B <- c(15, NA, NA, NA, 21,11)
A[2:length(A)] - B[1:length(B)-1]
[1] 20 NA NA NA 68
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