A BUG? of WITHIN function in R language

topic description

A BUG? of WITHIN function in R language

sources of topics and their own ideas

problems found when classifying with within function

related codes

doesn"t seem to show the correct R code, so I have to map it.

what result do you expect? What is the error message actually seen?

first time + b [b > 3000 & b < = 9999.9] <-"A"
second time + b [b > 3000 & b < = 10000.0] <-"A"
only increases 0.1, the classification can not get the correct result.
Let"s see if it is the BUG? of the WITHIN function in R language

.
Bug r
Mar.08,2022
The main reason for

is that the comparison operator of R is a little strange compared with other languages. 



<strong>,f$bcharacter</strong>

<blockquote>f <- data.frame(a = c(1,2,3,4,5,6), b = c(4400,2220,3080,3140,0,1150))
f<br>  a    b<br>1 1 4400<br>2 2 2220<br>3 3 3080<br>4 4 3140<br>5 5    0<br>6 6 1150


f <- within(f,{

</blockquote>
<ul>
<li>b[b > 1000 & b <= 3000] <- "B"</li>
<li>
<li>})</li>
</ul>
<blockquote>f<br>  a    b<br>1 1 4400<br>2 2    B<br>3 3 3080<br>4 4 3140<br>5 5    0<br>6 6    B
summary(f)

</blockquote>

   a             b            


 Min. : 1.00 Length:6 
 1st Qu.:2.25 Class: character 
 Median: 3.50 Mode: character 
 Mean: 3.50 
 3rd Qu.:4.75 
 Max. : 6.00 


 within (f, {


    

  •  b [b > 3000 & b < = 10000.0] <-"A" 
    • 

  • 

  • }) 
     a b 
    • 



 1 1 4400 
 22 B 
 3 3 3080 
 44 3140 
 550 
 6 6B 


 "4400" < = 10000.0 
 [1] FALSE 
 "4400" < = 9999.9 
 [1] TRUE 


 f <-data.frame (a = c (1,), b, 2, 3, 4, 5, 5,), b = c (4400, 2220, 3080, 3140, 050)) 


 f 
 a b 
 11 4400 
 22 2220 
 3 3 3080 
 44 3140 
 5 50 
 6 6 1150 


 f <-within (f, {




    

  •  b [b > 1000 & b < = 3000] <-1 
    • 

  • 

  • }) 
    • 



 f 
 a b 
 1 1 4400 
 221 
 3 3 3080 
 44 3140 
 550 
 6 61 
 summary (f) 




   a              b       


 Min. : 1.00 Min. : 0 
 1st Qu.:2.25 1st Qu.: 1 
 Median: 3.50Median: 1540 
 Mean: 3.50Mean: 1770 
 3rd Qu.:4.75 3rd Qu.:3125 
 Max. : 6.00 Max. : 4400 


 within (f, {


    

  •  b [b > 3000 & b < = 10000.0] <-2 
    • 

  • 

  • }) 
     a b 
    • 



 1 12 
 2 21 
 3 32 
 4 42 
 550 
 6 61

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