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print vectors with consecutive numbers

4 messages · James Wei, Jorge I Velez, Bert Gunter

James Wei
# 
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
Jorge I Velez
# 
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:

            

      
      
      
    

        

      
      
    

        

  
  


  


      

    

    

      
      

        


  

        

      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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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html

and provide commented, minimal, self-contained, reproducible code.

  
  


  


      

    

    

      
      

        


  

        

      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:

            

      
      
      
    

        
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