[R] mystery "158"

PIKAL Petr petr.pikal at precheza.cz
Wed Nov 22 10:15:05 CET 2017 

Well, ?factor does not say anything about this behaviour (assigning numeric code instead of level of factor). And actually if you do assignment for whole vector the result is different (vector in data frame is changed to factor).

> temp2$fff[1]<-vec[1]
> head(temp2,2)
  pokus minuty  fff
1   T42    240    3
2   T42    300 <NA>
> temp2$fff<-vec
> head(temp2,2)
  pokus minuty fff
1   T42    240   c
2   T42    300   c
>
> is.factor(vec[1])
[1] TRUE

I am not experieenced enough to explain what is happening but it is probably combination selection ?"[" and assignment ?"<-" operation.

I was not able to pinpoint explanation of this in help pages but maybe I only did not read it correctly.

dput(temp2)
temp2 <- structure(list(pokus = structure(c(1L, 1L, 1L, 2L, 2L, 2L, 2L,
2L, 3L, 3L, 3L, 3L, 4L, 4L, 4L, 5L, 5L, 6L, 6L, 7L, 7L, 8L, 8L
), .Label = c("T42", "T43", "T44", "T45", "T46", "T47", "T48",
"T49"), class = "factor"), minuty = structure(c(2L, 3L, 4L, 2L,
3L, 4L, 5L, 6L, 1L, 2L, 3L, 4L, 2L, 3L, 4L, 2L, 3L, 2L, 3L, 2L,
3L, 2L, 3L), .Label = c("180", "240", "300", "360", "420", "480"
), class = "factor"), fff = c(NA_character_, NA_character_, NA_character_,
NA_character_, NA_character_, NA_character_, NA_character_, NA_character_,
NA_character_, NA_character_, NA_character_, NA_character_, NA_character_,
NA_character_, NA_character_, NA_character_, NA_character_, NA_character_,
NA_character_, NA_character_, NA_character_, NA_character_, NA_character_
)), .Names = c("pokus", "minuty", "fff"), row.names = c(NA, -23L
), class = "data.frame")

> dput(vec)
vec <- structure(c(3L, 3L, 2L, 5L, 3L, 4L, 2L, 2L, 1L, 1L, 5L, 3L, 4L,
1L, 2L, 5L, 2L, 4L, 5L, 5L, 2L, 5L, 4L), .Label = c("a", "b",
"c", "d", "e"), class = "factor")

Cheers
Petr



> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Peter
> Langfelder
> Sent: Wednesday, November 22, 2017 12:00 AM
> To: Glen Forister <gforister at gmail.com>
> Cc: R <r-help at r-project.org>
> Subject: Re: [R] mystery "158"
>
> Your data frame fam contains factors. Turn it into character strings using
>
> fam$Family = as.character(fam$Family)
>
> and try again. It may be helpful if you read up on R's factors, see ?factor.
>
> HTH,
>
> Peter
>
> On Tue, Nov 21, 2017 at 2:14 PM, Glen Forister <gforister at gmail.com> wrote:
> > This is a simple problem, but a mystery to me.
> > I'm trying to grab $Family "Scelionidae" from one dataframe and put it
> > into another dataframe occupied with NA in $Family.  The result is a
> > "158" ends up there instead of Scelionidae.
> > Simply put      fam$Family[1] <- least$Family[1]
> >
> > If I have made a mistake here, can somebody point it out.  I've
> > included the simple steps I got there showing the structure and heads of the
> objects.
> > =====  add a col of NA  = Family
> >> least$Family <- NA; str(least)
> > 'data.frame':    243 obs. of  6 variables:
> >  $ sp    : int  1 3 5 6 8 11 13 15 18 19 ...
> >  $ Fallon: int  14 11 109 6 1 44 70 23 4 100 ...
> >  $ Dimen : int  10 13 52 2 1 19 18 0 2 116 ...
> >  $ Farm  : int  6 2 3 0 0 2 0 1 2 1 ...
> >  $ Sums  : int  30 26 164 8 2 65 88 24 8 217 ...
> >  $ Family: logi  NA NA NA NA NA NA ...
> >>head(least,2)
> >   sp Fallon Dimen Farm Sums Family
> > 1  1     14    10    6   30     NA
> > 3  3     11    13    2   26     NA
> >>
> >> #next change the property logi to char least$Family <-
> >> as.character(least$Family)
> >> str(least)
> > 'data.frame':    243 obs. of  6 variables:
> >  $ sp    : int  1 3 5 6 8 11 13 15 18 19 ...
> >  $ Fallon: int  14 11 109 6 1 44 70 23 4 100 ...
> >  $ Dimen : int  10 13 52 2 1 19 18 0 2 116 ...
> >  $ Farm  : int  6 2 3 0 0 2 0 1 2 1 ...
> >  $ Sums  : int  30 26 164 8 2 65 88 24 8 217 ...
> >  $ Family: chr  NA NA NA NA ...
> >>#  This is where I will grab the info to put into the above.
> >> head(fam,2)
> >          Family Sp
> > 1   Scelionidae  1
> > 2         Aphid  2
> >>#  This shows the id of my object I want to copy  fam$Family[1]
> > [1] Scelionidae
> > 180 Levels:  ? ? = 97 ? immature ? sp sample ?? ???? 1 2 3 ... wolf?
> >>
> >># This shows me copying Scelionidae into dataframe least
> >>least$Family[1] <- fam$Family[1]
> >>
> >>#    Here is where I don't get what I expect, but 158
> >>str(least);
> > 'data.frame':    243 obs. of  6 variables:
> >  $ sp    : int  1 3 5 6 8 11 13 15 18 19 ...
> >  $ Fallon: int  14 11 109 6 1 44 70 23 4 100 ...
> >  $ Dimen : int  10 13 52 2 1 19 18 0 2 116 ...
> >  $ Farm  : int  6 2 3 0 0 2 0 1 2 1 ...
> >  $ Sums  : int  30 26 164 8 2 65 88 24 8 217 ...
> >  $ Family: chr  "158" NA NA NA ...
> >>head(least, 1)
> >   sp Fallon Dimen Farm Sums Family
> > 1  1     14     10        6       30    158
> >>
> >>#    Showing what I wanted to copy still exists.
> >> fam$Family[1]
> > [1] Scelionidae
> > 180 Levels:  ? ? = 97 ? immature ? sp sample ?? ???? 1 2 3 ... wolf?
> >
> >         [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> > http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

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