Created
May 1, 2017 15:35
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| x <- 1:15 | |
| y <- x^2 | |
| d <- data.frame(x, y) # 另外一種建立 data.frame 的方法 | |
| d | |
| dy <- diff(y) | |
| dy <- c(NA, dy) #add a blank NA as the first element | |
| d <- cbind(d, dy) | |
| d | |
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