[R] Median on second group of CSV file produce Na
PIKAL Petr
petr.pikal at precheza.cz
Wed Sep 2 08:04:54 CEST 2015
Hi
and if you are in learning R you can help yourself a lot reading chapters 2-7 from R intro manual, which you can probably find in doc folder within your R installation.
It is only about 30 pages and it gives you concise insight into R objects and how to manipulate with them.
Cheers
Petr
> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of David
> Winsemius
> Sent: Tuesday, September 01, 2015 8:13 PM
> To: shawin
> Cc: r-help at r-project.org
> Subject: Re: [R] Median on second group of CSV file produce Na
>
>
> On Sep 1, 2015, at 6:48 AM, shawin wrote:
>
> > The str() out come is :
> >
> > chr [1:31099, 1:8] " 9.329651" " 8.583304" " 9.284229" " 9.746094"
> > "10.200084" " 9.249863" " 7.979661" "11.271934" ...
> > - attr(*, "dimnames")=List of 2
> > ..$ : NULL
> > ..$ : chr [1:8] "GSM215579.CEL" "GSM215580.CEL" "GSM215581.CEL"
> > "GSM215582.CEL" ...
> >
>
> So the matrix you thought was numeric is actually a character-object.
> The median function returns NA for character arguments. I'm seeing
> spaces in front of the decimal numbers so appears your input statements
> need to be somehow adjusted, or you need to coerce the matrix to
> numeric. The colClasses argument to read.table and cousins should be
> used more often.
>
> --
> David.
>
>
> > On Tue, Sep 1, 2015 at 2:32 PM, Michael Dewey-3 [via R] <
> > ml-node+s789695n4711716h95 at n4.nabble.com> wrote:
> >
> >> What happened when you did summary(y) or str(y)?
> >>
> >> On 01/09/2015 08:57, Navien wrote:
> >>
> >>> Dear Michael ,
> >>>
> >>> Thank you very much for your reply , kindly please can i send you
> the
> >>> program and data please , y is shown a normal csv file no issue
> with it
> >> :(
> >>>
> >>>
> >>> Kind Regards
> >>>
> >>> On Tue, Sep 1, 2015 at 8:36 AM, Michael Dewey-3 [via R] <
> >>> [hidden email]
> <http:///user/SendEmail.jtp?type=node&node=4711716&i=0>>
> >> wrote:
> >>>
> >>>> Dear Shawin
> >>>>
> >>>> You probably did not get an answer because
> >>>> 1 - you seem to have posted in HTML which mangled your post into
> >>>> unreadability
> >>>> 2 - there seem to be lots of lines which do not do anything
> germane to
> >>>> the problem.
> >>>>
> >>>> Why not try summary(y) or str(y) before you convert it to a matrix
> and
> >>>> see what it says?
> >>>>
> >>>> On 31/08/2015 20:46, shawin wrote:
> >>>>
> >>>>> I have an issue ans i posted it , so i would like to receive a
> >> solution
> >>>>> please
> >>>>>
> >>>>> On Mon, Aug 31, 2015 at 8:35 PM, shawin [via R] <
> >>>>> [hidden email]
> <http:///user/SendEmail.jtp?type=node&node=4711707&i=0>>
> >>
> >>>> wrote:
> >>>>>
> >>>>>> I have a data frame csv file and I'm trying to calculate median
> for
> >>>> each
> >>>>>> group separately row by row . When I separate the data frame in
> two
> >>>> groups
> >>>>>> and calculate the median for each one, I am getting an NA result
> for
> >>>> the
> >>>>>> second group :
> >>>>>> the data
> >>>>>> x1 x2 x3 x4 x5 x6 x7 y1 y2 y3 y4 y5 y6 y7 y8
> >>>>>> 9.488404158 9.470895414 9.282433728 9.366707445 9.955383045
> >> 9.640816474
> >>>>>> 9.606262272 9.329651027 9.434541611 9.473922432 9.311412966
> >> 9.3154885
> >>>>>> 9.434977488 9.470895414 9.764258059
> >>>>>> 8.630629966 8.55831075 8.788391003 8.576231135 8.671587906
> >> 8.842979993
> >>>>>> 8.861958856 8.58330436 8.603596508 8.570129609 8.59798922
> >> 8.572686772
> >>>>>> 8.679751791 8.663950953 8.432875347
> >>>>>> 9.354748885 9.367668838 9.259952558 9.421538213 9.554635162
> >> 9.603744578
> >>>>>> 9.452197983 9.284228877 9.404607878 9.317737979 9.343115301
> >> 9.310644266
> >>>>>> 9.27227486 9.360337823 9.44706281
> >>>>>> 9.944863964 9.950427516 10.19101759 10.07350804 10.03269879
> >> 10.1307908
> >>>>>> 10.03487287 9.74609383 9.886379007 9.775472567 10.036596
> >>>> 9.544738458
> >>>>>> 9.699611598 9.911962567
> >>>>>> 9.625804277
> >>>>>>
> >>>>>>
> >>>>>> Code:
> >>>>>>
> >>>>>> rowN <- nrow(AT1)
> >>>>>> MD1<-vector(length=rowN)
> >>>>>> MD2<-vector(length=rowN)
> >>>>>>
> >>>>>> MD1[1:rowN]<-NA
> >>>>>> MD2[1:rowN]<-NA
> >>>>>>
> >>>>>>
> >>>>>> x<- AT1[,c(2,3,4,5,6,7,8) ]
> >>>>>> write.csv(x,"x.csv",row.names=TRUE)
> >>>>>> x<-as.matrix(x)
> >>>>>> for(i in 2:rowN) {
> >>>>>> MD1[i]=median(x[i,])
> >>>>>> }
> >>>>>> write.csv(MD1,"MD1.csv",row.names=TRUE)
> >>>>>>
> >>>>>> y<- AT1[,c(9,10,11,12,13,14,15,16)]
> >>>>>> write.csv(y,"y.csv",row.names=TRUE)
> >>>>>> y<-as.matrix(y)
> >>>>>> for(j in 2:rowN) {
> >>>>>> MD2[j]=median(y[j,])
> >>>>>> }
> >>>>>> write.csv(MD2,"MD2.csv",row.names=TRUE)
> >>>>>>
> >>>>>>
> >>>>>> ------------------------------
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> produce-Na-tp4711689.html
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> >>>>
> >>>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> --
> >>>>> View this message in context:
> >>>>
> >> http://r.789695.n4.nabble.com/Median-on-second-group-of-CSV-file-
> produce-Na-tp4711689p4711690.html
> >>>>> Sent from the R help mailing list archive at Nabble.com.
> >>>>> [[alternative HTML version deleted]]
> >>>>>
> >>>>> ______________________________________________
> >>>>> [hidden email]
> <http:///user/SendEmail.jtp?type=node&node=4711707&i=2>
> >>
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> >>>>
> >>>> --
> >>>> Michael
> >>>> http://www.dewey.myzen.co.uk/home.html
> >>>>
> >>>> ______________________________________________
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> produce-Na-tp4711689p4711707.html
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> >>>> .
> >>>> NAML
> >>>> <
> >>
> http://r.789695.n4.nabble.com/template/NamlServlet.jtp?macro=macro_view
> er&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.Ba
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> >>
> >>>>
> >>>
> >>>
> >>>
> >>>
> >>> --
> >>> View this message in context:
> >> http://r.789695.n4.nabble.com/Median-on-second-group-of-CSV-file-
> produce-Na-tp4711689p4711709.html
> >>> Sent from the R help mailing list archive at Nabble.com.
> >>> [[alternative HTML version deleted]]
> >>>
> >>> ______________________________________________
> >>> [hidden email]
> <http:///user/SendEmail.jtp?type=node&node=4711716&i=2>
> >> mailing list -- To UNSUBSCRIBE and more, see
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> >>> PLEASE do read the posting guide
> >> http://www.R-project.org/posting-guide.html
> >>> and provide commented, minimal, self-contained, reproducible code.
> >>>
> >>
> >> --
> >> Michael
> >> http://www.dewey.myzen.co.uk/home.html
> >>
> >> ______________________________________________
> >> [hidden email]
> <http:///user/SendEmail.jtp?type=node&node=4711716&i=3>
> >> 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.
> >>
> >>
> >> ------------------------------
> >> If you reply to this email, your message will be added to the
> discussion
> >> below:
> >>
> >> http://r.789695.n4.nabble.com/Median-on-second-group-of-CSV-file-
> produce-Na-tp4711689p4711716.html
> >> To start a new topic under R help, email
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> >> .
> >> NAML
> >>
> <http://r.789695.n4.nabble.com/template/NamlServlet.jtp?macro=macro_vie
> wer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.B
> asicNamespace-nabble.view.web.template.NabbleNamespace-
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> 1nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-
> send_instant_email%21nabble%3Aemail.naml>
> >>
> >
> >
> >
> >
> > --
> > View this message in context: http://r.789695.n4.nabble.com/Median-
> on-second-group-of-CSV-file-produce-Na-tp4711689p4711718.html
> > Sent from the R help mailing list archive at Nabble.com.
> > [[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.
>
> David Winsemius
> Alameda, CA, USA
>
> ______________________________________________
> 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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