R help - Feb 2016 - adding a column to data frame solving the replacement problem

Hi all,?

I have a data set (mydata) containing 471 variables. One of the columns looks as
below?

$ Sequence : Factor w/ 3 levels "","%Seq%gre",..: 2 2 2 2 2
2 2 2 2 2 ...?

sequence contains %Seq%gre and %Seq%tse and I extract only %Seq%tse and add it
to my variables and plot a scatterplot of mydata. I use table and the result is:
table(mydata$Sequence)?
?%Seq%gre %Seq%tse?
? ? ? ? ? 1 ? ? ? ? ? 25520 ? ? ? ? ?243744?
in the next step I ?want to add a column to my main data set (mydata) containing
only %Seq%tse, however when I use the following command there's an error
telling me:?
Error in `$<-.data.frame`(`*tmp*`, "NewColumn", value = c(3L, 3L,
3L, ?:?
? replacement has 243744 rows, data has 269265?
How can I add this column correctly to mydata??
Thanks for any help
	[[alternative HTML version deleted]]

Hi

It seems to me that you misunderstand how objects (data.frames) in R work.

see in line
> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of hoda
> rahmati via R-help
> Sent: Wednesday, February 24, 2016 3:39 PM
> To: r-help at r-project.org
> Subject: [R] adding a column to data frame solving the replacement
> problem
>
> Hi all,
>
> I have a data set (mydata) containing 471 variables. One of the columns
> looks as below
>
> $ Sequence : Factor w/ 3 levels "","%Seq%gre",..: 2 2 2
2 2 2 2 2 2 2
There is also missing value in this column. I am not sure if it is intended, it
is your decision. To get missing values as really missing when importing data
you shall explicitly use na identifier in read command, something like.

mydata <- read.*(something, na.string="")

from help page:
na.strings
a character vector of strings which are to be interpreted as NA values. Blank
fields are also considered to be missing values in logical, integer, numeric and
complex fields.
> ...
>
> sequence contains %Seq%gre and %Seq%tse and I extract only %Seq%tse and
> add it to my variables and plot a scatterplot of mydata. I use table
> and the result is: table(mydata$Sequence)
>  %Seq%gre %Seq%tse
>           1           25520          243744 in the next step I  want to
> add a column to my main data set (mydata) containing only %Seq%tse,
> however when I use the following command there's an error telling me:
> Error in `$<-.data.frame`(`*tmp*`, "NewColumn", value = c(3L,
3L, 3L,
>  :
>   replacement has 243744 rows, data has 269265 How can I add this
> column correctly to mydata? Thanks for any help
There is no command in your mail. However all columns in data frame has to have
the same length, so when you add shorter vector it is recycled without error.

see
iris$aaa <- letters[1:5]
head(iris,10)

This simple command does not produce error.

I can get similar error
> iris[iris$aaa=="c", 1]<- iris[,2]
Error in `[<-.data.frame`(`*tmp*`, iris$aaa == "c", 1, value =
c(3.5,  :
  replacement has 150 rows, data has 30

this results from operation in which I try add longer vector to shorter data
frame.

To get more specific answer, you shall add exact command you used (maybe also a
toy working example).

>       [[alternative HTML version deleted]]
And you shall post in plain text, not HTML.

Cheers
Petr
>
> ______________________________________________
> 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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On Friday, February 26, 2016 2:17 PM, hoda rahmati <hodarahmati68 at
yahoo.com> wrote:
 

 Hi,Thank you for your answer and sorry that I forgot to add the command I used,
the command is:mydata$NewColumn <--
mydata$Sequence[mydata$Sequence=="%Seq%tse"and then the Error that I
got.what I want to do after adding the new column is to plot the other two
variables I have in my data frame(mydata) according to the color, and the color
I want is just for "%Seq%tse"?.do you have any idea?
Thanks Hoda 



       On Thursday, February 25, 2016 8:39 AM, PIKAL Petr <petr.pikal at
precheza.cz> wrote:
 

 Hi

It seems to me that you misunderstand how objects (data.frames) in R work.

see in line
> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of hoda
> rahmati via R-help
> Sent: Wednesday, February 24, 2016 3:39 PM
> To: r-help at r-project.org
> Subject: [R] adding a column to data frame solving the replacement
> problem
>
> Hi all,
>
> I have a data set (mydata) containing 471 variables. One of the columns
> looks as below
>
> $ Sequence : Factor w/ 3 levels "","%Seq%gre",..: 2 2 2
2 2 2 2 2 2 2
There is also missing value in this column. I am not sure if it is intended, it
is your decision. To get missing values as really missing when importing data
you shall explicitly use na identifier in read command, something like.

mydata <- read.*(something, na.string="")

from help page:
na.strings
a character vector of strings which are to be interpreted as NA values. Blank
fields are also considered to be missing values in logical, integer, numeric and
complex fields.
> ...
>
> sequence contains %Seq%gre and %Seq%tse and I extract only %Seq%tse and
> add it to my variables and plot a scatterplot of mydata. I use table
> and the result is: table(mydata$Sequence)
>? %Seq%gre %Seq%tse
>? ? ? ? ? 1? ? ? ? ? 25520? ? ? ? ? 243744 in the next step I? want to
> add a column to my main data set (mydata) containing only %Seq%tse,
> however when I use the following command there's an error telling me:
> Error in `$<-.data.frame`(`*tmp*`, "NewColumn", value = c(3L,
3L, 3L,
>? :
>? replacement has 243744 rows, data has 269265 How can I add this
> column correctly to mydata? Thanks for any help
There is no command in your mail. However all columns in data frame has to have
the same length, so when you add shorter vector it is recycled without error.

see
iris$aaa <- letters[1:5]
head(iris,10)

This simple command does not produce error.

I can get similar error
> iris[iris$aaa=="c", 1]<- iris[,2]
Error in `[<-.data.frame`(`*tmp*`, iris$aaa == "c", 1, value =
c(3.5,? :
? replacement has 150 rows, data has 30

this results from operation in which I try add longer vector to shorter data
frame.

To get more specific answer, you shall add exact command you used (maybe also a
toy working example).

>? ? ? [[alternative HTML version deleted]]
And you shall post in plain text, not HTML.

Cheers
Petr
>
> ______________________________________________
> 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.
________________________________
Tento e-mail a jak?koliv k n?mu p?ipojen? dokumenty jsou d?v?rn? a jsou ur?eny
pouze jeho adres?t?m.
Jestli?e jste obdr?el(a) tento e-mail omylem, informujte laskav? neprodlen? jeho
odes?latele. Obsah tohoto emailu i s p??lohami a jeho kopie vyma?te ze sv?ho
syst?mu.
Nejste-li zam??len?m adres?tem tohoto emailu, nejste opr?vn?ni tento email
jakkoliv u??vat, roz?i?ovat, kop?rovat ?i zve?ej?ovat.
Odes?latel e-mailu neodpov?d? za eventu?ln? ?kodu zp?sobenou modifikacemi ?i
zpo?d?n?m p?enosu e-mailu.

V p??pad?, ?e je tento e-mail sou??st? obchodn?ho jedn?n?:
- vyhrazuje si odes?latel pr?vo ukon?it kdykoliv jedn?n? o uzav?en? smlouvy, a
to z jak?hokoliv d?vodu i bez uveden? d?vodu.
- a obsahuje-li nab?dku, je adres?t opr?vn?n nab?dku bezodkladn? p?ijmout;
Odes?latel tohoto e-mailu (nab?dky) vylu?uje p?ijet? nab?dky ze strany p??jemce
s dodatkem ?i odchylkou.
- trv? odes?latel na tom, ?e p??slu?n? smlouva je uzav?ena teprve v?slovn?m
dosa?en?m shody na v?ech jej?ch n?le?itostech.
- odes?latel tohoto emailu informuje, ?e nen? opr?vn?n uzav?rat za spole?nost
??dn? smlouvy s v?jimkou p??pad?, kdy k tomu byl p?semn? zmocn?n nebo p?semn?
pov??en a takov? pov??en? nebo pln? moc byly adres?tovi tohoto emailu p??padn?
osob?, kterou adres?t zastupuje, p?edlo?eny nebo jejich existence je adres?tovi
?i osob? j?m zastoupen? zn?m?.

This e-mail and any documents attached to it may be confidential and are
intended only for its intended recipients.
If you received this e-mail by mistake, please immediately inform its sender.
Delete the contents of this e-mail with all attachments and its copies from your
system.
If you are not the intended recipient of this e-mail, you are not authorized to
use, disseminate, copy or disclose this e-mail in any manner.
The sender of this e-mail shall not be liable for any possible damage caused by
modifications of the e-mail or by delay with transfer of the email.

In case that this e-mail forms part of business dealings:
- the sender reserves the right to end negotiations about entering into a
contract in any time, for any reason, and without stating any reasoning.
- if the e-mail contains an offer, the recipient is entitled to immediately
accept such offer; The sender of this e-mail (offer) excludes any acceptance of
the offer on the part of the recipient containing any amendment or variation.
- the sender insists on that the respective contract is concluded only upon an
express mutual agreement on all its aspects.
- the sender of this e-mail informs that he/she is not authorized to enter into
any contracts on behalf of the company except for cases in which he/she is
expressly authorized to do so in writing, and such authorization or power of
attorney is submitted to the recipient or the person represented by the
recipient, or the existence of such authorization is known to the recipient of
the person represented by the recipient.


  
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