[R] print vectors with consecutive numbers

[James Wei]

Hi Jorge,
 
Thanks so much, it is working perfectly. There are so many for me to learn.
 
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





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