r - numbers within apply get filled with spaces -


i want create folder name based on 2 variables in data frame , wrong here...

head(clustering)   line  x  y   qerror 1  200 15 19 1.118677 2  201 11 19 1.038482 3  202  0  6 1.238026 4  203  0 18 1.321878 5  204  0 12 1.204173 6  205  5  0 1.394773 str(clustering) 'data.frame':   3406 obs. of  4 variables:  $ line  : factor w/ 3406 levels "1001","1003",..: 814 822 831 841 847 858 891 ...  $ x     : num  15 11 0 0 0 5 16 8 1 0 ...  $ y     : num  19 19 6 18 12 0 14 19 17 18 ...  $ qerror: num  1.12 1.04 1.24 1.32 1.2 ...

when try create folder name x , y columns, following:

apply(head(clustering),1,function(x){paste0('x',x[2],'_by_y',x[3])})            1            2            3            4            5            6  "x15_by_y19" "x11_by_y19" "x 0_by_y 6" "x 0_by_y18" "x 0_by_y12" "x 5_by_y 0"

as can see, x , y additional space, if value smaller 10. when use without apply, seems work

paste0('x',clustering[3,2],'_by_y',clustering[3,3]) [1] "x0_by_y6"

has idea, why there spaces?

it's because of following lines apply:

if (!dl)    stop("dim(x) must have positive length") if (is.object(x))    x <- if (dl == 2l)      as.matrix(x) else as.array(x)

as.matrix calls format, , format + as.matrix can unexpected things. see "details" section as.matrix. format page notes "character strings padded blanks display width of widest."

here's demonstration showing format responsible behavior have identified:

lapply(mydf, format) # $line # [1] "200" "201" "202" "203" "204" "205" #  # $x # [1] "15" "11" " 0" " 0" " 0" " 5" #  # $y # [1] "19" "19" " 6" "18" "12" " 0" #  # $qerror # [1] "1.118677" "1.038482" "1.238026" "1.321878" "1.204173" "1.394773"

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