Message-ID: <BAY176-W344E0B16685F17D2A3E912C0D00@phx.gbl>
Date: 2014-08-22T12:18:04Z
From: James Wei
Subject: print vectors with consecutive numbers
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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