Description Usage Arguments Details Value Note See Also Examples

This page documents utilities from package Rmpfr which are typically not called by the user, but may come handy in some situations.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | ```
getPrec(x, base = 10, doNumeric = TRUE, is.mpfr = NA, bigq. = 128L)
getD(x)
mpfr_default_prec(prec)
## S3 method for class 'mpfrArray'
print(x, digits = NULL, drop0trailing = FALSE,
right = TRUE, ...)
## S3 method for class 'mpfr'
print(x, digits = NULL, drop0trailing = TRUE,
right = TRUE,
max.digits = getOption("Rmpfr.print.max.digits", 9999),
...)
toNum(from, rnd.mode = c('N','D','U','Z','A'))
mpfr2array(x, dim, dimnames = NULL, check = FALSE)
.mpfr2list(x, names = FALSE)
mpfrXport(x, names = FALSE)
mpfrImport(mxp)
``` |

`x, from` |
typically, an |

`base` |
(only when |

`doNumeric` |
logical indicating |

`is.mpfr` |
logical indicating if |

`bigq.` |
for |

`prec` |
a positive integer, or missing. |

`drop0trailing` |
logical indicating if trailing |

`right` |
logical indicating |

`digits, ...` |
further arguments to print methods. |

`max.digits` |
a number (possibly |

`rnd.mode` |
a 1-letter string specifying how |

`dim, dimnames` |
for |

`check` |
logical indicating if the mpfrArray construction should happen with internal safety check. Previously, the implicit default used to be true. |

`names` |
(for |

`mxp` |
an |

The `print`

method is currently built on the `format`

method for class `mpfr`

. This, currently does
*not* format columns jointly which leads to suboptimally looking
output. There are plans to change this.

Note that `formatMpfr()`

which is called by `print()`

(or `show()`

or **R**'s implicit printing) uses ```
max.digits =
Inf
```

, differing from our `print()`

's default on purpose.
If you do want to see the full accuracy even in cases it is large, use
`options(Rmpfr.print.max.digits = Inf)`

or
`.. = 1e7)`

, say.

`getPrec(x)`

returns a `integer`

vector of the same
length as `x`

when that is positive, whereas `getPrec(NULL)`

returns `mpfr_default_prec()`

, see below.
If you need to *change* the precision of `x`

, i.e., need
something like “setPrec”, use `roundMpfr()`

.

`getD(x)`

is intended to be a fast version of `[email protected]`

,
and should not be used outside of lower level functions.

`mpfr_default_prec()`

returns the current MPFR default precision,
an `integer`

. This is currently
not made use of, in all of package Rmpfr, where functions have
their own default precision where needed.

`mpfr_default_prec(prec)`

*sets* the current MPFR default
precision and returns the previous one; see above.

`toNum(m)`

returns a numeric `array`

or
`matrix`

, when `m`

is of class
`"mpfrArray"`

or `"mpfrMatrix"`

,
respectively. It should be equivalent to `as(m, "array")`

or
`... "matrix"`

. Note that the slightly more general
`asNumeric()`

is preferred now.

`mpfr2array()`

a slightly more flexible alternative to
`dim(.) <- dd`

.

`mpfrXport()`

and `mpfrImport()`

are **experimental** and
used to explore reported platform incompatibilities of
`save()`

d and `load()`

ed `"mpfr"`

objects between Windows and non-Windows platforms.

In other words, the format of the result of `mpfrXport()`

and
hence the `mxp`

argument to `mpfrImport()`

are considered
internal, not part of the API and subject to change.

Start using `mpfr(..)`

, and compute with these numbers.

`mpfrArray(x)`

is for numeric (“non-mpfr”)
`x`

, whereas `mpfr2array(x)`

is for `"mpfr"`

classed
`x`

, only.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | ```
getPrec(as(c(1,pi), "mpfr")) # 128 for both
(opr <- mpfr_default_prec()) ## typically 53, the MPFR system default
stopifnot(opr == (oprec <- mpfr_default_prec(70)),
70 == mpfr_default_prec())
## and reset it:
mpfr_default_prec(opr)
## Explore behavior of rounding modes 'rnd.mode':
x <- mpfr(10,99)^512 # too large for regular (double prec. / numeric):
sapply(c("N", "D", "U", "Z", "A"), function(RM)
sapply(list(-x,x), function(.) toNum(., RM)))
## N D U Z A
## -Inf -Inf -1.797693e+308 -1.797693e+308 -Inf
## Inf 1.797693e+308 Inf 1.797693e+308 Inf
## Printing of "MPFR" matrices is less nice than R's usual matrix printing:
m <- outer(c(1, 3.14, -1024.5678), c(1, 1e-3, 10,100))
m[3,3] <- round(m[3,3])
m
mpfr(m, 50)
B6 <- mpfr2array(Bernoulli(1:6, 60), c(2,3),
dimnames = list(LETTERS[1:2], letters[1:3]))
B6
## Looking at internal representation [for power users only!]:
i8 <- mpfr(-2:5, 32)
x4 <- mpfr(c(NA, NaN, -Inf, Inf), 32)
## The output of the following depends on the GMP "numb" size
## (32 bit vs. 64 bit), and may be even more platform specifics:
str( .mpfr2list(i8) )
str( .mpfr2list(x4, names = TRUE) )
str(xp4 <- mpfrXport(x4, names = TRUE))
stopifnot(identical(x4, mpfrImport(mpfrXport(x4))),
identical(i8, mpfrImport(mpfrXport(i8))))
if(FALSE) ## FIXME: not yet working:
stopifnot(identical(B6, mpfrImport(mpfrXport(B6))))
``` |

Rmpfr documentation built on Jan. 13, 2018, 1:11 a.m.

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