Read a local, or remote, neuronlistfh object saved to a file.
The file path of the neuronlistfh object. Can be local, or remote (via http or ftp).
If the file is to be fetched from a remote location, this is
the folder in which downloaded RDS file will be saved. The default value of
Whether to update local copy of neuronlistfh (default: FALSE, see details)
Extra arguments to pass to
When reading a remote
neuronlistfh object, it is downloaded
and cached to
localdir. If there is already a cached file at the
appropriate location and
update=TRUE then the md5sums are checked
and the downloaded file will be copied on top of the original copy if they
are different; if
udpate=FALSE, the default, then no action will be
taken. After downloading a remote
neuronlistfh object, a check is
made for the existence of the
data directory that will be used to
individual objects. If this does not exist it will be created.
Note also that there is a strict convention for the layout of the
files on disk. The neuronlistfh object will be saved in R's
format and will be placed next to a folder called
data which will
contain the data objects, also saved in RDS format. For example if
myneurons.rds is downloaded to
localdir="\path\to\localdir" the resultant file layout will be as
Given this arrangment, the data directory should always be at a fixed
location with respect to the saved neuronlistfh object and this is enforced
on download and the default behaviour on read and write. However it does
remain possible (if not recommended) to site the neuronlistfh and filehash
database directory in different relative locations; if the neuronlistfh
object specified by file does not have a filehash database with a valid
dir slot and there is no 'data' directory adjacent to the
neuronlistfh object, an error will result.
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