[R] Extract letters from a column

[SH]

Dear Jorge,

I gave me this result (below) since it defines starting from the forth
letter and ending 6th letter from the first element.

> substr(tempdf$name, 4, 6)
[1] " Cr" "ad " "old"

I would like to have letters from first and second elements if possible.

Thanks for replying,

Steve


On Wed, Mar 13, 2013 at 10:10 AM, Jorge I Velez
<jorgeivanvelez at gmail.com> wrote:
> Dear SH,
>
> Hmmm... what about
>
> substr(tempdf$name, 4, 6))
>
> ?
>
> HTH,
> Jorge.-
>
>
> On Thu, Mar 14, 2013 at 1:06 AM, SH <emptican at gmail.com> wrote:
>>
>> Dear list:
>>
>> I would like to extract three letters from first and second elements
>> in one column and make a new column.
>>
>> For example below,
>>
>> > tempdf = read.table("clipboard", header=T, sep='\t')
>> > tempdf
>>               name var1 var2    abb
>> 1      Tom Cruiser    1    6 TomCru
>> 2       Bread Pett    2    5 BrePet
>> 3 Arnold Schwiezer    3    7 ArnSch
>> > (p1 = substr(tempdf$name, 1, 3))
>> [1] "Tom" "Bre" "Arn"
>>
>> I was able to extract three letters from first name, however, I don't
>> know how to extract three letters from last name (i.e., 'Cru', 'Pet',
>> and 'Sch').  Can anyone give me a suggestion?  Many thanks in advance.
>>
>> Best,
>>
>> Steve
>>
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>
>