[R] cbind() function : Not able to display columns

[Richard M. Heiberger]

In addition to what the others have told you, it looks like you might
be confusing
matrices with data.frames.  Please see
?data.frame

I think what you are looking for is

> b <- c('a','b','c')
> c <- c("ee","tt","rr")
> k <- cbind(a,b,c)
> K <- data.frame(a, b, c)
> K
  a b  c
1 1 a ee
2 2 b tt
3 3 c rr

I recommend using " <- " for assignment (not the spaces on both sides), not "=".

On Wed, Oct 23, 2013 at 12:01 AM, Jeff Newmiller
<jdnewmil at dcn.davis.ca.us> wrote:
> Hard to say, not sure what you want to do. But the columns are not denoted by [a], [b] or [c]. You should learn to use the str function to understand what various expressions really are, and return to the "Introduction to R" document that comes with the software. There is a distinct difference between a and "a" in R, and square brackets are not at all like quotes. See help("[") and the ItoR section on indexing.
>
> You might get what you want by k[,"b"] for example.
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>
> Vivek Singh <vksingh.iiitb at gmail.com> wrote:
>>Hi All,
>>
>>
>>I have create a matrix using cbind() function as follows:
>>
>>
>>> a=c(1,2,3)
>>
>>> b=c('a','b','c')
>>
>>> c=c("ee","tt","rr")
>>
>>
>>> k=cbind(a,b,c)
>>
>>
>>Problem: when we print the matrix k,
>>
>>> k
>>
>>    a   b   c
>>
>>[1,] "1" "a" "ee"
>>
>>[2,] "2" "b" "tt"
>>
>>[3,] "3" "c" "rr"
>>
>>we can see that rows are represented by [1,] , [2,] and [3,].
>>Similarly,
>>the columns are denoted by [a], [b] and [c]. When we try to print the
>>corresponding columns, we are able to print for k[a], i.e., the first
>>column but not able to correctly print the second and third columns.
>>
>>> k[a]
>>
>>[1] "1" "2" "3"
>>
>>> k[b]
>>
>>[1] NA NA NA
>>
>>> k[c]
>>
>>[1] NA NA NA
>>
>>Please let me know what am I doing wrong.
>
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