Re: [R] modifying a vector

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From: A.J. Rossini (rossini@blindglobe.net)
Date: Sun 30 Jun 2002 - 15:34:24 EST 

Message-id: <87vg81e3dr.fsf@jeeves.blindglobe.net>

>>>>> "tim" == Tim Wilson <wilson@visi.com> writes:

    tim> Hello everyone, Thanks to all who offered suggestions after
    tim> my initial query to the list. I've been busy trying to
    tim> absorb the docs as fast as possible, but this little thing
    tim> has me stumped for the moment.

    tim> I'm creating a random sample of 100 item and saving it to a
    tim> vector named 'iq'. I'd like to create a second vector
    tim> (iq_prime, say) by adding 20 to each element of the 'iq'
    tim> vector. Here's what I've tried.

Note that "_" is assignment in S (and hence R, sigh...).

>> iq <- rnorm(100, 80, 15)
>> t(dstats(iq)) # Thanks Brett Magill
    tim> mean sd variance min max unique n miss skewness
    tim> kurtosis
    tim> [1,] 78.628 14.223 202.302 49.079 121.294 100 100 0
    tim> 0.3 0.191
>> iq_prime <- sapply(iq, function(x)x+20)

iq.prime <- iq + 20

# "." is a separation character, as well as having other overloaded
# meanings.

>> iq_prime
>> t(dstats(iq))
    tim> mean sd variance min max unique n miss
    tim> skewness kurtosis
    tim> [1,] 98.628 14.223 202.302 69.079 141.294 100 100 0
    tim> 0.3 0.191

best,
-tony 

-- 
A.J. Rossini				Rsrch. Asst. Prof. of Biostatistics
U. of Washington Biostatistics		rossini@u.washington.edu	
FHCRC/SCHARP/HIV Vaccine Trials Net	rossini@scharp.org
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