CRAN  R Documentation 
This function allows package developers to run tests themselves that should not run on CRAN or with "R CMD check –ascran" because of compute time constraints with CRAN tests.
CRAN(CRAN_pattern, n_R_CHECK4CRAN)
CRAN_pattern 
a regular expressions to apply to the names of 
n_R_CHECK4CRAN 
Assume this is CRAN if at least n_R_CHECK4CRAN elements of

The "Writing R Extensions" manual says that "R CMD check" can be customized "by setting environment variables _R_CHECK_*_:, as described in" the Tools section of the "R Internals" manual.
'R CMD check' was tested with R 3.0.1 under Fedora 18 Linux and with Rtools 3.0 from April 16, 2013 under Windows 7. With the '–ascran' option, 7 matches were found; without it, only 3 were found. These numbers were unaffected by the presence or absence of the '–timings' parameter. On this basis, the default value of n_R_CHECK4CRAN was set at 5.
1. x. < Sys.getenv()
2. Fix CRAN_pattern
and n_R_CHECK4CRAN
if missing.
3. Let i be the indices of x. whose names match all the patterns in the vector x.
4. Assume this is CRAN if length(i) >= n_R_CHECK4CRAN
a logical scalar with attributes 'Sys.getenv' containing the results
of Sys.getenv()
and 'matches' contining i
per step 3
above.
Ramsay, James O., Hooker, Giles, and Graves, Spencer (2009), Functional data analysis with R and Matlab, Springer, New York.
Ramsay, James O., and Silverman, Bernard W. (2005), Functional Data Analysis, 2nd ed., Springer, New York.
Ramsay, James O., and Silverman, Bernard W. (2002), Applied Functional Data Analysis, Springer, New York.
Sys.getenv
# Look in fdaex.R
# for the results from R CMD check
# Modified defaults were tested with environment variables
# _CRAN_pattern_ = 'A' and _n_R_CHECK4CRAN_ = '10'
# 'R CMD check' found 26 matches and CRAN() returned TRUE
cran < CRAN()
str(cran)
gete < attr(cran, 'Sys.getenv')
(ngete < names(gete))
iget < grep('^_', names(gete))
gete[iget]
# if (!CRAN()) {
# if (CRAN()) {
# stop("CRAN")
# } else {
# stop("NOT CRAN")
# }
# }
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