[R] Assignment of values with different indexes
Pascal Oettli
kridox at ymail.com
Thu Dec 6 04:01:45 CET 2012
Hello,
I am sorry, but I sincerely don't understand what you are trying to do.
Regards,
Pascal
Le 06/12/2012 11:47, Brian Feeny a écrit :
>
> I would like to take the values of observations and map them to a new index. I am not sure how to accomplish this. The result would look like so:
>
> x[1,2,3,4,5,6,7,8,9,10]
> becomes
> y[2,4,6,8,10,12,14,16,18,20]
>
> The "newindex" would not necessarily be this sequence, but a sequence I have stored in a vector, so it could be all kinds of values. here is what happens:
>
>> x <- rnorm(10)
>> myindex <- seq(from = 1,to = 20, by = 2)
>> y <- numeric()
>> y[myindex] <- x
>> y
> [1] -0.03745988 NA -0.09078822 NA 0.92484413 NA 0.32057426 NA
> [9] 0.01536279 NA 0.02200198 NA 0.37535438 NA 1.46606535 NA
> [17] 1.44855796 NA -0.05048738
>
> So yes, it maps the values to my new indexes, but I have NA's. The result I want would look like this instead:
>
>
> [1] -0.03745988
> [3] -0.09078822
> [5] 0.92484413
> [7] 0.32057426
> [9] 0.01536279
> [11] 0.02200198
> [13] 0.37535438
> [15] 1.46606535
> [17] 1.44855796
> [19] -0.05048738
>
>
> and remove the NA's. I tried this with na.omit() on x, but it looks like so:
>
>> x <- rnorm(10)
>> myindex <- seq(from = 1,to = 20, by = 2)
>> y <- numeric()
>> y[myindex] <- na.omit(x)
>> y
> [1] 0.87399523 NA -0.39908184 NA 0.14583051 NA 0.01850755 NA
> [9] -0.47413632 NA 0.88410517 NA -1.64939190 NA 0.57650807 NA
> [17] 0.44016971 NA -0.56313802
>
> Brian
>
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