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This release adds multi-source support, request of (#131): a tidync object can now present a consolidated lazy view across a collection of NetCDF sources, extending the filter-then-read model unchanged from one file to many.
tidync() now accepts a vector of file paths together
with a concat_dim argument, building a consolidated view
across sources along that dimension (typically time). Downstream
operations (hyper_filter(), hyper_array(),
hyper_tibble(), hyper_tbl_cube()) work
transparently across the collection, and only the files needed for the
current selection are opened at read time. A single file with
concat_dim is a valid degenerate collection.
Fast mode for large collections:
tidync(files, concat_dim = "time", fast = TRUE) skips full
metadata scans of sources 2..N, reading only the concat dimension
coordinate from each file. Validation is deferred to data-read time,
where dimension mismatches are reported with the offending file named.
In fast mode the time coordinate is presented numerically (no timestamp
column), since per-source calendar metadata is not read; use the default
full mode for CFtime timestamps.
Zero file I/O construction: supply coordinate values directly
with concat_dim = list(name = "time", values = dates) and
only the first source is opened (as the template). Values can be
numeric, Date, or POSIXct, and hyper_filter() operates on
them directly. This is aimed at file-database workflows (for example
raadfiles) where per-file coordinates are already known. This
construction assumes one step per source; files holding more steps on
the concat dimension are detected at read time and reported as an error
rather than silently subset.
Read-time validation is armed automatically for fast mode and for values-supplied construction: shared dimensions and the per-source concat dimension length are checked against the consolidated view as each file is opened, with clear errors naming the file.
Optional parallel reads via mirai: when
mirai::daemons() are active, per-source reads in
hyper_array() run in parallel with
mirai::mirai_map(), falling back to sequential reads when
mirai is not installed or no daemons are set. Parallelism is entirely
under user control; tidync never starts daemons itself. Errors raised
during parallel reads (including validation failures) propagate
normally.
Sources are kept in the order supplied; the consolidated
index on the concat dimension is file order. Value-based
filters work regardless of ordering, but supply sources in coordinate
order for a monotonic view.
tidync() on a tidync_data object
(round-trip) preserves the source table and
concat_dim.
hyper_array()
time, consistent with single-source behaviour. Non-contiguous selections
that span whole sources (for example dropping intermediate files) are
supported and read only the files required.Fixed hyper_tibble() producing constant dimension
values when drop = TRUE (the default) collapses arrays to
bare vectors; expansion is now based on length() rather
than prod(dim()).
Fixed the print method showing NA for min/max of Date/POSIXct
coordinate columns; non-numeric coordinates are now converted with
as.numeric() (Date as days since epoch) rather than
replaced with NA.
Repaired mangled pipe operators in the package overview help examples.
Removed commented-out browser() calls.
Update to CFTime as_timestamp(), thanks to @fabern.
Support for CF time metadata via package CFtime thanks to @pvanlaake, see https://github.com/ropensci/tidync/pull/124
Suppress ncdf4 warnings on open, issue #119.
Minimum R version is now 4.1.0 (native pipe |>).
Removed forcats, magrittr, and purrr dependencies; %>%
replaced with |> throughout and
purrr::safely() replaced with
tryCatch().
ncmeta (>= 0.5.0) is now required, for extended (CFtime) metadata and for correct handling of sources with no variables (such as compound-type L3 bin files), which errored uninformatively with earlier ncmeta under current dplyr.
Minimum dplyr version is 1.1.0 (multiple argument in
joins) and minimum tidyr version is 1.0.0 (cols argument in
unnest()); all version-gating conditionals
removed.
mirai added to Suggests.
print.tidync now returns its input invisibly, as
always claimed.
hyper_array() and hyper_tibble() and
hyper_tbl_cube(), and allowed user-controlled option to
avoid this check. Thanks to Alessandro Bigi for feedback.tbl_cube()
thanks to Hadley Wickham PR #102.Fix broken tests due to changes in RNetCDF, thanks to CRAN for notification.
Added example to readme and docs, and checks for non-unique
hyper_filter() names, as per #93. Thanks to @everydayduffy for
the suggestion.
Now depends on R 3.5.0.
Removed obscure numeric ‘what’ logic for
activate().
Fixed tidync method for hyper_array()
output.
Found a really bad bug in hyper_array() (#92), now
fixed. Axis order in transforms was sometimes reversed, which caused
garbled results from hyper_tibble(). The effect is to ruin
any ggplot2 figures for some source files. It’s very likely that no
other system yet uses the hyper_array() format so impact is
low.
tidync is now part of the rOpenSci project.
Fixes in tests and examples to avoid version-incapable NetCDF problems on Solaris.
A number of improved tests and documentation fixes.
Deal with warnings from tidyr version > 0.8.3.
A huge thank you to all rOpenSci contributions, especially very
helpful reviews from
@Nowosad and @timcdlucas as well as
organizers @karthik, @stefaniebutland and @sckott.
Helpful input was also provided via issues from @adrfantini, @JustBerkhout, @matteodefelice, @rensa, @rmendels, @sw-rifai, and @tremenyi.
Package improvements thanks to CRAN feedback, clarified
Description and added more examples. Replaced cat() and
print() calls with message() and
warning().
New class ‘tidync_data’ for output of hyper_array(),
no underlying change to the object which is simply a list of arrays from
each variable, and axis transforms stored in an attribute.
Old deprecated function axis_transforms() now
Defunct.
FIRST RELEASE, tidync was greatly improved via help from the rOpenSci review process.
New function hyper_grids() to report available grid
names.
A printing error of dimension value ranges is now fixed, thanks to James Goldie (#84).
Now supports ‘NC_CHAR’ type, by exploding these into the array size expected.
Breaking change: when using tidync$gridit’s now
expected that this must be
tidyr::unnest()ed in order to expand out the grid list per
variable, in line with
https://github.com/hypertidy/ncmeta/issues/26.
The hyper_array function now stores the relevant
transforms table as an attribute transforms so that objects
can be constructed directly from the native array output.
Function rename hyper_array() now matches
hyper_tibble() indicating the form of the output (rather
than the action used, was hyper_slice()).
New functions hyper_vars() and
hyper_dims() for reporting on the currently active
variables and dimensions and their status.
Now dependent on ncmeta >= 0.0.2, partly to avoid crashing on invalid source or file strings
Removed hyper_index() and incorporated that into
hyper_filter(), there’s now only one delay-capable class
which is ‘tidync’
Function hyper_filter() now uses a selection idiom,
to record the state of the axis rather than explicitly filter it. This
means we can have more flexibility on what the axis transform tables can
be used for, and removes some unwieldy handling code. All the available
axes are on the object from first contact, which means we can program
against the entire space in the source which will help for complex
mapping scenarios.
Function hyper filter() print now handles the case
of char-type coordinate values by setting the min and max to
NA_real_
Various improvements and fixes for the print method for tidync
Support coordinate-less dimensions has been added, there is new information in the print summary about which dimensions are a “coord_dim” and this results in the axis transform tables using the index as the coordinate value.
Functions hyper_slice() and
hyper_tibble() now return all variables that exist within a
grid
This version sees a new model where activation is on ‘grids’, effectively a space composed of dimensions. In addition to the variables, dimension, and attributes entities we add ‘grid’ defined by a set of dimensions, and ‘axis’ which is an instance of a particular dimension as used by a variable.
Sources without recognizable variables now gracefully handled, with help from ncmeta.
Now imports ncdump > 0.0.3.
Installed external example data from Unidata website
First working version now has tidync(), and
hyper_*() family of functions.
Migrated from ncdump.
These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.