Message-ID: <4dc0b405-b049-4ca3-9a3c-dd9123f417eb@email.android.com>
Date: 2013-03-06T02:18:24Z
From: Jeff Newmiller
Subject: About basic logical operators
In-Reply-To: <1362531230.67909.YahooMailNeo@web125803.mail.ne1.yahoo.com>
faq 7.31
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Sent from my phone. Please excuse my brevity.
Victor hyk <victor_hyk at yahoo.ca> wrote:
>Hello everyone,
>????????? I have a basic question regarding logical operators.
>> x<-seq(-1,1,by=0.02)
>> x
>? [1] -1.00 -0.98 -0.96 -0.94 -0.92 -0.90 -0.88 -0.86 -0.84 -0.82 -0.80
>-0.78
>?[13] -0.76 -0.74 -0.72 -0.70 -0.68 -0.66 -0.64 -0.62 -0.60 -0.58 -0.56
>-0.54
>?[25] -0.52 -0.50 -0.48 -0.46 -0.44 -0.42 -0.40 -0.38 -0.36 -0.34 -0.32
>-0.30
>?[37] -0.28 -0.26 -0.24 -0.22 -0.20 -0.18 -0.16 -0.14 -0.12 -0.10 -0.08
>-0.06
>?[49] -0.04 -0.02? 0.00? 0.02? 0.04? 0.06? 0.08? 0.10? 0.12? 0.14?
>0.16? 0.18
>?[61]? 0.20? 0.22? 0.24? 0.26? 0.28? 0.30? 0.32? 0.34? 0.36? 0.38?
>0.40? 0.42
>?[73]? 0.44? 0.46? 0.48? 0.50? 0.52? 0.54? 0.56? 0.58? 0.60? 0.62?
>0.64? 0.66
>?[85]? 0.68? 0.70? 0.72? 0.74? 0.76? 0.78? 0.80? 0.82? 0.84? 0.86?
>0.88? 0.90
>?[97]? 0.92? 0.94? 0.96? 0.98? 1.00
>> x[x<=0.02]
>?[1] -1.00 -0.98 -0.96 -0.94 -0.92 -0.90 -0.88 -0.86 -0.84 -0.82 -0.80
>-0.78
>[13] -0.76 -0.74 -0.72 -0.70 -0.68 -0.66 -0.64 -0.62 -0.60 -0.58 -0.56
>-0.54
>[25] -0.52 -0.50 -0.48 -0.46 -0.44 -0.42 -0.40 -0.38 -0.36 -0.34 -0.32
>-0.30
>[37] -0.28 -0.26 -0.24 -0.22 -0.20 -0.18 -0.16 -0.14 -0.12 -0.10 -0.08
>-0.06
>[49] -0.04 -0.02? 0.00
>> x[x<0.2]
>?[1] -1.00 -0.98 -0.96 -0.94 -0.92 -0.90 -0.88 -0.86 -0.84 -0.82 -0.80
>-0.78
>[13] -0.76 -0.74 -0.72 -0.70 -0.68 -0.66 -0.64 -0.62 -0.60 -0.58 -0.56
>-0.54
>[25] -0.52 -0.50 -0.48 -0.46 -0.44 -0.42 -0.40 -0.38 -0.36 -0.34 -0.32
>-0.30
>[37] -0.28 -0.26 -0.24 -0.22 -0.20 -0.18 -0.16 -0.14 -0.12 -0.10 -0.08
>-0.06
>[49] -0.04 -0.02? 0.00? 0.02? 0.04? 0.06? 0.08? 0.10? 0.12? 0.14? 0.16?
>0.18
>[61]? 0.20
>>
>???? Why does "x[x<=0.02]" return? no 0.02 but "x[x<0.2]" return a
>subsample with 0.02?
>???? Anyone who can tell me why?
>???? Thanks!
>
>???? Victor
>
> [[alternative HTML version deleted]]
>
>
>
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