[R] Count unchanged class attribute

[Soe Xiyan]

My apologize if the question is confusing. This is due to my English
language.
Thanks to Jim Lemon who has helped me.
I must to learn R harder, like how to use  "unlist" and "list".

On Wed, May 20, 2015 at 1:36 PM, Jim Lemon <drjimlemon at gmail.com> wrote:

> Hi Xiyan,
> I have to admit that your puzzle very nearly stumped me. At first I
> thought the question was:
>
> "What are the numbers of rows with changed and unchanged class values?"
>
> That doesn't work as there are at most four rows and your answer sums
> to five. I then tried:
>
> "How many times does at least one value of class change between
> successive data frames?"
>
> Nope, four have at least one change. Could it have been:
>
> "Using unique combinations of the values of Netto and Bruto, how many
> changes have occurred?"
>
> Wrong again, there are 12 combinations, not five. Surely you don't mean:
>
> "In how many data frames does ta least one value of class equal 'no'?"
>
> df1<-data.frame(Netto=c(10,100),Bruto=c(1000,20),class=c("yes","yes"))
> df2<-data.frame(Netto=c(101,100),Bruto=c(1000,210),class=c("yes","no"))
>
> df3<-data.frame(Netto=c(10,12,100),Bruto=c(10,28,20),class=c("yes","yes","yes"))
> df4<-data.frame(Netto=c(120,400),Bruto=c(200,20),class=c("no","yes"))
> df5<-data.frame(Netto=c(110,1100,120,1140),Bruto=c(12000,120,100,125),
>  class=c("yes","yes","yes","yes"))
> sxdat<-list(df1,df2,df3,df4,df5)
> table(ifelse(unlist(lapply(sxdat,function(x)
> return(any(x$class=="no")))),"changed","unchanged"))
>
> Jim
>
> On Wed, May 20, 2015 at 1:04 PM, Bert Gunter <gunter.berton at gene.com>
> wrote:
> > Probably "or what."
> >
> > This demonstrates a fundamental conundrum: many users or prospective
> users
> > of R have had little exposure to data structures in their formal
> education
> > and therefore can be flummoxed by R's fussiness -- as any programming
> > language must necessarily be. Consider: data frames, matrices, lists,
> > "classes", objects with attributes (e.g. factors),...
> >
> > Excel, which is basically structureless, of course, exacerbates the
> > problem. Those accustomed to its tolerance (and the confusion that
> results)
> > expect R to behave the same way. Education is the only recourse, either
> in
> > formal courses or through R tutorials that strongly emphasize this aspect
> > of interacting with R and especially writing effective code. But that
> > demands effort and, to some extent, aptitude... both of which seem to be
> in
> > increasingly short supply amidst the worldwide explosion in R's usage.
> >
> > Of course, feel free to disagree... Just my $.02
> >
> > Cheers,
> > Bert
> >
> >
> > Bert Gunter
> > Genentech Nonclinical Biostatistics
> > (650) 467-7374
> >
> > "Data is not information. Information is not knowledge. And knowledge is
> > certainly not wisdom."
> > Clifford Stoll
> >
> >
> >
> > On Tue, May 19, 2015 at 7:02 PM, John Kane <jrkrideau at inbox.com> wrote:
> >
> >> Is this a list of data.frames or what?
> >>
> >> Please have a look at one or both of these for some ideas of how to ask
> a
> >> question and provide information on the problem.  The better you can
> >> describe what you have and what you need the better people can help.
> >>
> >>
> http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example
> >> and http://adv-r.had.co.nz/Reproducibility.html
> >>
> >>
> >> John Kane
> >> Kingston ON Canada
> >>
> >>
> >> > -----Original Message-----
> >> > From: soe.xiyan at gmail.com
> >> > Sent: Tue, 19 May 2015 23:37:13 +0700
> >> > To: r-help at r-project.org
> >> > Subject: [R] Count unchanged class attribute
> >> >
> >> > Maybe someone can help me.
> >> > Suppose I have data-set like this:
> >> >
> >> >   Netto   Bruto  class
> >> > 1 10      1000    yes
> >> > 2 100     20      yes
> >> >
> >> >
> >> >   Netto   Bruto  class
> >> > 1 101     1000    yes
> >> > 2 100     210     no
> >> >
> >> >
> >> >   Netto   Bruto  class
> >> > 1 10      10      yes
> >> > 2 12      28      yes
> >> > 3 100     20      yes
> >> >
> >> >   Netto   Bruto  class
> >> > 1 120     200     no
> >> > 2 400     20      yes
> >> >
> >> >
> >> >   Netto   Bruto  class
> >> > 1 110     12000   yes
> >> > 2 1100    120     yes
> >> > 3 120     100     yes
> >> > 4 1140    125     yes
> >> >
> >> > How to calculate the number of classes has changed.
> >> > The expected result is
> >> > - class changed    2
> >> > - class unchanged  3
> >> >
> >> >
> >> > Thank you so much.
> >> > Soe Xiyan
> >> >
> >> >       [[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.
> >>
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> >>
> >> ______________________________________________
> >> 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.
> >>
> >
> >         [[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.
>

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