例如 999999999999999 會顯示 1e+15。
想要不要讓它以科學記號呈現，
加入options(scipen=999)，
就都不會以科學記號方式呈現了。
以下為範例：
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| x <- 999999999999999 | |
| x | |
| ##1e+15 | |
| options(scipen = 999) | |
| x | |
| ##999999999999999 |
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