read.spc loads frequency spectrum from
write.spc saves frequency spectrum object in
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character string specifying the pathname of a disk file.
Files with extension
a frequency spectrum, i.e.\ an object of class
A TAB-delimited text file with column headers but no row names
(suitable for reading with
read.delim). The file must contain
at least the following two columns:
frequency class m
number V_m of types in frequency class m (or expected class size E[V_m])
An optional column labelled
VVm can be used to specify
variances of expected class sizes (for a frequency spectrum derived
from a LNRE model or by binomial interpolation).
These columns may appear in any order in the text file. All other columns will be silently ignored.
If the filename
file ends in the extension
the disk file will automatically be decompressed (
read.spc) or compressed (
.spc file format does not store the values of
VV explicitly. Therefore, incomplete frequency
spectra and expected spectra with variances cannot be fully
reconstructed from disk files. Saving such frequency spectra (or
loading a spectrum with variance data) will trigger corresponding
read.spc returns an object of class
spc (see the
spc manpage for details)
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## save Italian ultra- frequency spectru to external text file fname <- tempfile(fileext=".spc") write.spc(ItaUltra.spc, fname) ## now <fname> is a TAB-delimited text file with columns m and Vm ## we ready it back in New.spc <- read.spc(fname) ## same spectrum as ItaUltra.spc, compare: summary(New.spc) summary(ItaUltra.spc) stopifnot(isTRUE(all.equal(New.spc, ItaUltra.spc))) # should be identical ## Not run: ## DON'T do the following, incomplete spectrum will not be restored properly !!! zm <- lnre("zm", ItaUltra.spc) # estimate model zm.spc <- lnre.spc(zm,N(zm)) # incomplete spectrum from model write.spc(zm.spc, fname) # WARNINGS bad.spc <- read.spc(fname) # but this function cannot know something is wrong summary(zm.spc) summary(bad.spc) # note that N and V are completely wrong !!! ## End(Not run)
zipfR object for frequency spectrum Sample size: N = 3467 Vocabulary size: V = 523 Class sizes: Vm = 333 68 37 15 11 4 4 5 ... zipfR object for frequency spectrum Sample size: N = 3467 Vocabulary size: V = 523 Class sizes: Vm = 333 68 37 15 11 4 4 5 ... Warning message: In write.spc(zm.spc, fname) : saving incomplete frequency spectrum, which cannot be restored from disk file! zipfR object for expected frequency spectrum, incomplete (m <= 100) Sample size: N = 3467 Vocabulary size: V = 526.1246 Class sizes: Vm = 350.9382 59.02895 26.29556 15.35928 10.24896 7.407276 5.646891 4.472625 ... zipfR object for frequency spectrum Sample size: N = 1848.805 Vocabulary size: V = 519.4727 Class sizes: Vm = 350.9382 59.02895 26.29556 15.35928 10.24896 7.407276 5.646891 4.472625 ...
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