[R] Extracting data using subset function
drj|m|emon @end|ng |rom gm@||@com
Sun Feb 5 22:17:58 CET 2023
As a couple of respondents noted, you only need the logical statement,
You did "frame the logical condition" in your example, for if you use
the extraction operator "[" this will work:
subset(p,(1:length(p)) <= 20)
as Jeff already pointed out. Obviously it is easier to write:
p[(1:length(p)) <= 20]
Let's say you want to select the odd numbers in p:
 TRUE FALSE TRUE FALSE TRUE FALSE TRUE FALSE TRUE FALSE
 1 3 5 7 9
The as.logical() has to be included as the extractor function tries
use integers as indices
So the problem is really to reduce your selection criteria to a vector
of TRUER/FALSE values.
On Mon, Feb 6, 2023 at 1:07 AM Upananda Pani <upananda.pani using gmail.com> wrote:
> Dear All,
> I want to create a vector p and extract first 20 observations using subset
> function based on logical condition.
> My code is below
> p <- 0:100
> I know i can extract the first 20 observations using the following command.
> q <- p[1:20]
> But I want to extract the first 20 observations using subset function which
> requires a logical condition. I am not able to frame the logical condition.
> The code should be
> q <- subset(p, logical condition)
> I am not able to do it. Please let me know what you think.
> Best regards,
> [[alternative HTML version deleted]]
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