Straight to the point, I have this data-frame which i want to re-number its index, if this is the right 'term' to use.
month1 ID
1 8.27 57
2 6.70 59
3 9.61 60
4 10.79 61
5 10.22 62
The catch is that these two columns come from different sql datasets that share some keys. And i need to re-index my table according to these keys.
For example there is this expression for (i in val2$TMEST_ID[i] == val$ID[i])
containing those two above-mentioned keys. The latest val$ID
is actually the ID
column already on my datafame.
So how can i re-arrange my data so i can have month1
values according to the above relationship?
Note that i am mostly interested in re-arranging rather than re-creating from start my dataframe.
I hope question is clear enough, if not please do ask for clarifications. thanks
I think this is what you want?
vec <- c(8,6,4)
head(mtcars[order(mtcars$cyl, match(mtcars$cyl, vec)),])
mpg cyl disp hp drat wt qsec vs am gear carb
Datsun 710 22.8 4 108.0 93 3.85 2.320 18.61 1 1 4 1
Merc 240D 24.4 4 146.7 62 3.69 3.190 20.00 1 0 4 2
Merc 230 22.8 4 140.8 95 3.92 3.150 22.90 1 0 4 2
Fiat 128 32.4 4 78.7 66 4.08 2.200 19.47 1 1 4 1
Honda Civic 30.4 4 75.7 52 4.93 1.615 18.52 1 1 4 2
Toyota Corolla 33.9 4 71.1 65 4.22 1.835 19.90 1 1 4 1
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.