[R] print vectors with consecutive numbers

[Bert Gunter]

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 Fri, Aug 22, 2014 at 7:16 AM, James Wei <zwei0428 at hotmail.com> wrote:
> Hi Jorge,
>
> Thanks so much, it is working perfectly. There are so many for me to learn.

Have you done an R tutorial?  e.g.

http://cran.r-project.org/doc/manuals/R-intro.pdf

(This ships with R. There are many others around the web. Just search).

If not, please do not post further until you have done so. You cannot
complain of ignorance when you have not made an honest effort to
learn. And if you have already, post away.

Cheers,
Bert

>
> Cheers.
>
> James
>
> From: jorgeivanvelez at gmail.com
> Date: Fri, 22 Aug 2014 22:28:40 +1000
> Subject: Re: [R] print vectors with consecutive numbers
> To: zwei0428 at hotmail.com
> CC: r-help at r-project.org
>
> Hi James,
>
>
> Try
> mat[, apply(mat, 2, function(x) any(diff(x) == 1))]
>
>
>
> HTH,
>
> Jorge.-
>
>
> On Fri, Aug 22, 2014 at 10:18 PM, James Wei <zwei0428 at hotmail.com> wrote:
>
>
>
>
>
>
> Hi all,
>
>
>
> I have a matrix with consecutive and non-consecutive numbers
>
> in columns. For example, the first 2 columns have consecutive numbers. I want R
>
> to print only columns with consecutive numbers. Here is the matrix and how I
>
> did using conditional statement:
>
>
>
> ##
>
>
>
> mat=matrix(data=c(9,2,3,4,5,6,10,13,15,17,19,22,
>
> 25,27,29,31,34,37,39,41),ncol=5)
>
>
>
> mat
>
>
>
> difference = diff(mat)==1
>
>
>
> difference
>
>
>
> y1=difference[1,]
>
>
>
> y2=difference[2,]
>
>
>
> y3=difference[3,]
>
>
>
> y=(y1|y2|y3)
>
>
>
> y
>
>
>
>
>
>
>
> if (y=="TRUE") mat else 0
>
>
>
> ##
>
>
>
> However, R still print all 5 columns, not the first 2
>
> columns I wanted. I got the Warning message:
>
>
>
> In if (y == "TRUE") mat else 0 :
>
>
>
>   the condition has
>
> length > 1 and only the first element will be used
>
>
>
> How can I change the code to get only the first 2 columns
>
> with consecutive numbers printed? I am new to R.
>
>
>
> Thanks in advance for your help. James
>
>
>
>
>
>         [[alternative HTML version deleted]]
>
>
>
> ______________________________________________
>
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>
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>
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>
> and provide commented, minimal, self-contained, reproducible code.
>
>
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> 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.