, the
ones listed here have special meaning.
browser
specifies the default HTML browser,
used as the default value for the
browser argument
to
help.start and
browseURL.
continue
the string printed by the console to prompt for
the continuation of an incomplete expression.
The default is "+ ".
See also the options prompt and continueString.
continueString
the string printed by the console to prompt for
the continuation of an incomplete string.
The default is "Continue string: ".
See also the options prompt and continue.
contrasts
a vector of two character strings naming the
default contrasts to use for unordered factors and for ordered
factors, respectively.
This is primarily used in analysis of variance models.
dateformat.lenient
specifies whether date/time parsing should be lenient
in
as.Date.character.
If this is
TRUE (the default),
some date/time strings may be accepted even if
the text does not match exactly the date format string.
If this is
FALSE, date/time strings that
do not exactly match the date format string will produce an
NA value.
For example, if this option is FALSE,
the expression as.Date("12/2/1")
will produce an NA date object,
since the date string does not match the default format string "yyyy.MM.dd".
However, if this option is TRUE,
this expression will produce the date "2012-02-01".
defaultPackages
Specifies the packages to be loaded (in addition to "base") on startup.
By default, these are "utils", "grDevices", "graphics", "stats", and "methods".
device
The default option, "terrFakeDev", is implemented to provide a stub
for graphics compatibility.
digits
the number of significant digits to use in
print (and therefore in automatic printing).
Setting
digits=17 gives the full length of double-precision numbers.
A valid value is 1 to 22.
The default is 7.
echo
a logical flag. If TRUE, prompt strings are printed, and each complete
expression is echoed before it is evaluated when the input is not an interactive tty connection.
The default is TRUE.
encoding
the default character encoding when opening input streams
with functions like
file or
source.
Used for converting input bytes to characters.
The default is
"UTF-8".
example.ask
The default value for the
ask argument to the
example function.
This is initially "default".
expressions
the maximum depth to which expressions can be
nested. This option exists primarily to catch runaway recursive calls
in a function. A valid value is 25 to 500000. The default is 300.
Note that this protects against stack overflow and cannot be safely
expanded beyond about 300.
The precise maximum safe value depends on the platform,
whether Java is being used or not,
and which C functions are being called recursively.
hashDiagnostics
specifies whether to print diagnostic messages when manipulating hash tables,
used in certain internal algorithms.
The default is FALSE.
hasHyperThreads
specifies whether the processor should use hyperthreading.
Initially, this is 1 if the processor supports hyperthreads, 0 otherwise.
Setting this to zero will disable hyperthreading.
Setting this to one will enable hyperthreading, if it is supported by the processor.
Setting this to a negative integer will reinitialize its value to zero or one,
depending on whether the processor supports hyperthreads.
help.ports
a vector of port numbers to be used by
startDynamicHelp
for the dynamic HTTP help server.
If this is
NULL (the default),
startDynamicHelp will try a set of random port numbers.
help.search.types
the default value to be used for the
types argument to
help.search.
This is initially
c("vignette", "demo", "help").
help.try.all.packages
the default value to be used for the
try.all.packages
argument to
help
This is initially
FALSE.
help_type
the default value to be used for the
help_type argument to
help.
This is initially
"html" on Windows platforms and
"text" otherwise.
HTTPUserAgent
a character string containing the user agent string for HTTP requests
sent via a
url connection.
If
NULL, no user agent string is used.
immediateObjectReuse
specifies whether the memory management system should
immediately reuse object storage when an object's reference count
goes to zero (if the value is TRUE, the default),
or whether it should wait for the garbage collector to reclaim it.
interrupt
if this is a function, it will be called with no arguments if an
interrupt
condition is not caught. If this function invokes a
restart named "resume", the interrupted computation is resumed.
keep.source
the default value to be used for the
keep.source argument to
source and
parse.
This is initially
TRUE.
keep.source.pkgs
the default value to be used for the
keep.source argument to
library,
require,
loadNamespace, and
sys.source.
This is initially
TRUE.
max.print
the maximum number of elements to print by
print.default.
The default is 5000.
mkl.num.threads
the maximum number of threads used by the Intel MKL numeric library.
A negative value means to use the value of the environment variable
MKL_NUM_THREADS if it is defined,
otherwise it uses the value of the option omp.num.threads.
The default is -1.
na.action
the default value to be used for the
na.action argument to
modeling functions such as
lm,
glm, etc.
This is initially
"na.omit".
omp.dynamic.threads
a logical flag.
If TRUE, the actual number of threads used
by OpenMP-enabled functions is determined by OpenMP,
and can be less than the number specified
by omp.num.threads.
The default is TRUE.
omp.num.threads
the maximum number of threads used by OpenMP-enabled functions.
Setting this to a negative value
will automatically set it to the value of the environment variable
OMP_NUM_THREADS if it is defined,
otherwise the number of physical cores.
The initial value is set to the number of physical cores.
OutDec
This option is not currently used in TIBCO Enterprise Runtime for R.
The default is ".".
pkgType
a character string indicating the type of package
to download, install, or update.
Used as the default value for the
type argument
for several functions including
available.packages
and
install.packages.
This is initially
"win.binary" on Windows platforms,
"mac.binary.mavericks" on Mac platforms,
and
"source" otherwise.
prompt
the string printed by the console to prompt for an expression.
The default is "> ".
See also the options continue and continueString.
repos
a character vector containing URLs that point
to specific packages repositories.
Used as the default value for the
type argument
for several functions including
download.packages,
install.packages and
update.packages.
saveRFormat
a logical flag used for the default of the
RFormat argument
of
save.
If this argument is
TRUE save writes files
using an R compatible format, which is a bit less efficient.
The default is
FALSE.
scipen
an integer value as penalty to bias towards fixed(positive penalty) or scientific(negative penalty) notation
when printing numeric values. The fixed notation will be used when its fixed width is no more than its scientific
width plus
"scipen" for a real number or pure imaginary.
For a complex number, the fixed notation will be used when its total fixed widths is less than its total
scientific widths plus "scipen"*2.
shareDataThreshold
a positive integer or NA.
If this is not NA,
the memory system will attempt to share vector storage, rather than copying,
for vectors whose length is equal or greater than this value.
The default is 64L.
sharePartialData
a logical flag.
When extracting a subset of a vector,
if this option is TRUE and the length of the subset
is greater or equal to shareDataThreshold,
the memory system will attempt to share vector storage, rather than copying,
The default is TRUE.
show.signif.stars
a logical flag used for the default of the
signif.stats argument
of
print.anova,
summary.lm,
printCoefmat, etc.
The default is
TRUE.
ssl.ca.bundle
a character string indicating the path to an SSL certificate authority
bundle containing the root certificates that should be used by URL
connections to SSL-encrypted servers.
This is used when creating a connection with
url
with a URL scheme such as "https". If
NULL, use the system provided
trusted certificate authority store on platforms where it is available.
The default is
NULL.
ssl.verify
a logical flag used to control whether SSL verification is performed on
SSL connections. The server's certificate is verified to make sure it
is issued by a certificate authority in the SSL certificate authority
bundle, and that the hostname in the certificate matches the hostname
used in the URL.
The default is TRUE.
str
a list of options that specify defaults for several arguments of
the
str function.
An appropriate list can be constructed by calling
strOptions.
strictNA
a logical flag. If FALSE, then NA and NaN values
are considered the same for many functions, which can improve performance.
The default is TRUE.
stringsAsFactors
a logical flag that provides the default
value for the argument of the same name in the
data.frame,
and
read.table functions
(which retrieve this value via the
default.stringsAsFactors function).
If
stringsAsFactors=TRUE, character input is converted to factors
in newly-created data frames.
The default is
FALSE.
Note that as of version 5.2 of TIBCO Enterprise Runtime for R, default.stringsAsFactors() returns FALSE instead of the previous TRUE unless the user has execututed options(stringsAsFactors=TRUE) earlier in the session. This matches the same change in version 4.0.0 of open-source R.
timeout
an integer. The timeout for connecting to and reading from URL
connections, in seconds. The default is 60.
ts.eps
a small number specifying the time series
comparison tolerance. This is used throughout the time series
functions for frequency comparisons. Frequencies are considered equal
if they differ in absolute value by less than ts.eps. The
default value is 1e-05.
url.debug
a character value that specifies a filename to verbosely log information
about the setup of URL connections to as they are initalized, or
NULL to disable verbose logging of URL connections. The default
is NULL.
url.method
a character string specifying the default method used to create URL connections
via the url() function when no method= argument is given.
It can have any valid value for url(method=...). Acceptable values are
"default", "wininet", "libcurl", and "internal".
The "wininet" method is supported on only Windows systems.
useFancyQuotes
specifies which quote characters are used by
sQuote and
dQuote.
The default is
FALSE, which says to use unidirectional ASCII quote characters.
vectorizeRNG
a logical flag specifying whether to use vectorized versions
of the Intel MKL random number generators,
which are more efficient at generating many random numnbers at once.
The default is TRUE.
verbose
a logical flag specifying whether verbose messages should be printed.
This option provides the default value for the argument of the same name
in several functions including
source,
library,
data,
gc, etc.
The default is
FALSE.
warn
specifies how the system should handle warnings
generated by calling the
warning
function or from internal system warnings.
- warn=-1: Warning messages are ignored.
- warn=0 (the default):
Warnings are collected and printed at the end of the evaluation.
The maximum number of unique warnings that are collected is controlled by the
warning.save option, which defaults to 50.
If more unique warnings are generated, they are turned into a single
warning such as "warning dropped (123 times)"
giving the number of warnings dropped.
The function warnings will return the stored
messages.
- warn=1: Warning messages are printed as they happen,
no matter how many there may be.
- warn=2: Warnings are converted into errors that
terminate evaluation of the expression.
Fatal errors, like those generated by calling
stop, are
unaffected by the
warn option.
warning.length
the length (in characters) of error and warning messages.
Anything longer than that value is truncated.
A valid value is 100 to 7170, and the default is 1000.
This option is not currently used in TIBCO Enterprise Runtime for R.
warning.save
the number of distinct warnings that are saved when
the warn option is 0.
The default value is 50.
width
the width (in characters) of an output page. A valid
value is 10 to 10000. The default value is 80.