[R] scan and skip - without line breaks in the input file

[Peter Ehlers]

Talk about asleep at the switch.
My sincere apologies to both Susanne and David for my
stupid message and to group for wasting everyone's time.

Ouch, that headslap hurt.

  -Peter

On 2010-02-27 11:05, Peter Ehlers wrote:
> David, Susanne,
>
> There may be a misunderstanding here. As I understand it,
> Susanne wants to be able to read the _second_ (and third, etc)
> 100K values after reading the first 100K, presumably to be
> processed separately for reasons I can't imagine. If that is
> correct, then I have no solution other than inserting
> delimiters before passing off to R.
>
> But Susanne, why do you need to read your data in this
> piece-meal fashion?
>
> -Peter Ehlers
>
> On 2010-02-27 10:46, David Winsemius wrote:
>>
>> On Feb 27, 2010, at 11:47 AM, Balzer Susanne wrote:
>>
>>> Hei David,
>>>
>>> Thanks for your quick response, but unfortunately n and nmax alone
>>> don't do the job. If I want to read items no. 100001 to 200000, the
>>> n=100000 option will work, but skip=100000 (to NOT read the first
>>> 100000 items) won't.
>>>
>>> Or with your example,
>>>
>>> scan(textConnection('1 2 3 4 5 6 7'), skip=3) will never work, while
>>
>> True.
>>>
>>> scan(textConnection('1 2 3 4 \n 5 \n 6 \n 7'), skip=3) will. But I
>>> don't have line breaks in my file.
>>
>> Right. That was what I was trying to help you deal with.
>>
>>>
>>> Is there no way to specify the character for a line break in scan /
>>> read.table / etc.?
>>
>> Why are you fixating on linefeeds when you don't have any?????
>>
>> > closeAllConnections()
>> > tc <- textConnection(paste(1:100, sep=" ", collapse=" "))
>> > scan(tc, nmax=10)
>> Read 10 items
>> [1] 1 2 3 4 5 6 7 8 9 10
>> > scan(tc, nmax=10)
>> Read 10 items
>> [1] 11 12 13 14 15 16 17 18 19 20
>> > scan(tc, nmax=10)
>> Read 10 items
>> [1] 21 22 23 24 25 26 27 28 29 30
>> > scan(tc, nmax=10)
>> Read 10 items
>> [1] 31 32 33 34 35 36 37 38 39 40
>> > scan(tc, nmax=10)
>> Read 10 items
>> [1] 41 42 43 44 45 46 47 48 49 50
>> > scan(tc, nmax=10)
>> Read 10 items
>> [1] 51 52 53 54 55 56 57 58 59 60
>> > scan(tc, nmax=10)
>> Read 10 items
>> [1] 61 62 63 64 65 66 67 68 69 70
>> > scan(tc, nmax=10)
>> Read 10 items
>> [1] 71 72 73 74 75 76 77 78 79 80
>> > scan(tc, nmax=10)
>> Read 10 items
>> [1] 81 82 83 84 85 86 87 88 89 90
>> > scan(tc, nmax=10)
>> Read 10 items
>> [1] 91 92 93 94 95 96 97 98 99 100
>> > scan(tc, nmax=10)
>> Read 0 items
>> numeric(0)
>>
>

-- 
Peter Ehlers
University of Calgary