John Kane
Kingston ON Canada
-----Original Message-----
From: gunter.ber...@gene.com
Sent: Tue, 19 May 2015 20:04:58 -0700
To: jrkrid...@inbox.com
Subject: Re: [R] Count unchanged class attribute
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),...
==========================
Nonsense, I am sure that weird feeling that my brain was being wrung out like a
dishcloth, that I felt for the first 3-5 weeks was due to something I ate and
had nothing to due with SPSS or SAS.
===========================
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.
================================
I don't think it's lack of aptitude but I seldom see much in the various
tutorials and books that really emphasis data structures or typing so people
can spend a lot of time figuring out what a list is. Who, me?
I agree that Excel is scary. I believe I mentioned before that I live in fear
that some medical spreadsheet will calculate a medical dose on my telephone
number rather than my weight. Of course, Excel being Excel, it would probably
obligingly translate a character-formatted telephone number into a real number.
I must try this the next time I get close to a machine with Excel.
===============================
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 <jrkrid...@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
[http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example]
and http://adv-r.had.co.nz/Reproducibility.html
[http://adv-r.had.co.nz/Reproducibility.html]
John Kane
Kingston ON Canada
> -----Original Message-----
> From: soe.xi...@gmail.com
> Sent: Tue, 19 May 2015 23:37:13 +0700
> To: r-help@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]]
>
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> [http://www.R-project.org/posting-guide.html]
> and provide commented, minimal, self-contained, reproducible code.
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and provide commented, minimal, self-contained, reproducible code.
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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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