>
>>>>>>>>
>>
>> Note that I don't really want to do rowSums in this case.  I'm just trying to
>> demonstrate the error.
>>
>> Of course, it's clear that the first line does NOT contain five elements, nor
>> does the second, etc., as all of the above-diagonal elements are blanks.
>>
>> But I've been unable to find an R input function that doesn't end up treating
>> the source data as a table, i.e., in the context of Babel source blocks -- R
>> is "happy" to read a lower-diagonal structure.  See the appendix for an
>> example.
>>
>> Any suggestions?  Note that I'm happy to acknowledge that my own ignorance of
>> R and/or Babel might be the source of the problem.  If so, please enlighten
>> me.
>>
>> Thanks.
>>
>> -- Mike
>>
>> [1] http://www.jstatsoft.org/v46/i03
>> [2] https://github.com/eschulte/babel-presentation
>>
>> <<<<<<
>> Appendix
>> --------
>>
>>
>> $ cat pascal.dat
>> 1
>> 1 1
>> 1 2 1
>> 1 3 3 1
>> 1 4 6 4 1
>>
>> $ R --vanilla < pascal.R
>>
>> R version 2.15.0 (2012-03-30)
>> Copyright (C) 2012 The R Foundation for Statistical Computing
>> ISBN 3-900051-07-0
>> Platform: x86_64-redhat-linux-gnu (64-bit)
>> .
>> .
>> .
>>
>>> x <- readLines("pascal.dat")
>>> x
>> [1] "1"         "1 1"       "1 2 1"     "1 3 3 1"   "1 4 6 4 1"
>>> str(x)
>>  chr [1:5] "1" "1 1" "1 2 1" "1 3 3 1" "1 4 6 4 1"
>>> 
>>> y <- scan("pascal.dat")
>> Read 15 items
>>> y
>>  [1] 1 1 1 1 2 1 1 3 3 1 1 4 6 4 1
>>> str(y)
>>  num [1:15] 1 1 1 1 2 1 1 3 3 1 ...
>>> 
>>> z <- read.table("pascal.dat", header=FALSE)
>> Error in scan(file, what, nmax, sep, dec, quote, skip, nlines, na.strings,  : 
>>   line 1 did not have 5 elements
>> Calls: read.table -> scan
>> Execution halted
>>
>>

-- 
Eric Schulte
http://cs.unm.edu/~eschulte/