About basic logical operators
faq 7.31
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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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