Hello,
I am trying to use the following function:
f<-function(x, y){
a<-select(x, y)
return(a)
}
f(sniegas, Birzai)
for me, this function looks okay, but when I try to run it with a variables "f(sniegas, Birzai)" I receive this error "Error in .f(.x[[i]], ...) : object 'Birzai' not found". Does anyone know why this error appear?
Thanks in advance 
You have to use tidy evaluation
library(dplyr)
library(rlang)
f <- function(x, y) {
a <- select(x, {{y}})
return(a)
}
f(iris, Sepal.Length)
#> Sepal.Length
#> 1 5.1
#> 2 4.9
#> 3 4.7
#> 4 4.6
#> 5 5.0
#> 6 5.4
#> 7 4.6
#> 8 5.0
#> 9 4.4
#> 10 4.9
#> 11 5.4
#> 12 4.8
#> 13 4.8
#> 14 4.3
#> 15 5.8
#> 16 5.7
#> 17 5.4
#> 18 5.1
#> 19 5.7
#> 20 5.1
#> 21 5.4
#> 22 5.1
#> 23 4.6
#> 24 5.1
#> 25 4.8
#> 26 5.0
#> 27 5.0
#> 28 5.2
#> 29 5.2
#> 30 4.7
#> 31 4.8
#> 32 5.4
#> 33 5.2
#> 34 5.5
#> 35 4.9
#> 36 5.0
#> 37 5.5
#> 38 4.9
#> 39 4.4
#> 40 5.1
#> 41 5.0
#> 42 4.5
#> 43 4.4
#> 44 5.0
#> 45 5.1
#> 46 4.8
#> 47 5.1
#> 48 4.6
#> 49 5.3
#> 50 5.0
#> 51 7.0
#> 52 6.4
#> 53 6.9
#> 54 5.5
#> 55 6.5
#> 56 5.7
#> 57 6.3
#> 58 4.9
#> 59 6.6
#> 60 5.2
#> 61 5.0
#> 62 5.9
#> 63 6.0
#> 64 6.1
#> 65 5.6
#> 66 6.7
#> 67 5.6
#> 68 5.8
#> 69 6.2
#> 70 5.6
#> 71 5.9
#> 72 6.1
#> 73 6.3
#> 74 6.1
#> 75 6.4
#> 76 6.6
#> 77 6.8
#> 78 6.7
#> 79 6.0
#> 80 5.7
#> 81 5.5
#> 82 5.5
#> 83 5.8
#> 84 6.0
#> 85 5.4
#> 86 6.0
#> 87 6.7
#> 88 6.3
#> 89 5.6
#> 90 5.5
#> 91 5.5
#> 92 6.1
#> 93 5.8
#> 94 5.0
#> 95 5.6
#> 96 5.7
#> 97 5.7
#> 98 6.2
#> 99 5.1
#> 100 5.7
#> 101 6.3
#> 102 5.8
#> 103 7.1
#> 104 6.3
#> 105 6.5
#> 106 7.6
#> 107 4.9
#> 108 7.3
#> 109 6.7
#> 110 7.2
#> 111 6.5
#> 112 6.4
#> 113 6.8
#> 114 5.7
#> 115 5.8
#> 116 6.4
#> 117 6.5
#> 118 7.7
#> 119 7.7
#> 120 6.0
#> 121 6.9
#> 122 5.6
#> 123 7.7
#> 124 6.3
#> 125 6.7
#> 126 7.2
#> 127 6.2
#> 128 6.1
#> 129 6.4
#> 130 7.2
#> 131 7.4
#> 132 7.9
#> 133 6.4
#> 134 6.3
#> 135 6.1
#> 136 7.7
#> 137 6.3
#> 138 6.4
#> 139 6.0
#> 140 6.9
#> 141 6.7
#> 142 6.9
#> 143 5.8
#> 144 6.8
#> 145 6.7
#> 146 6.7
#> 147 6.3
#> 148 6.5
#> 149 6.2
#> 150 5.9
Created on 2019-11-23 by the reprex package (v0.3.0.9000)
Thank you very much it worked
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