Fetch: Fetch R objects described in a data.frame
In OpasnetUtils: Opasnet Modelling Environment Utility Functions

Description Usage Arguments Details Value Author(s) Examples

Download a batch of R objects from Opasnet servers.

1 2	Fetch(dependencies, evaluate = FALSE, indent = 0, verbose = TRUE, ...) Fetch2(...)

`dependencies`	`data.frame` which defines variable names and "locations"
`evaluate`	`TRUE` to run `EvalOutput` on each variable (non-`ovariables` are ignored)
`indent`	`integer` internal argument for verbose printing
`verbose`	use `TRUE` to enable status messages in between fetches
`...`	excess arguments are ignored or passed to `EvalOutput` if evaluate is `TRUE`

The input data.frame should have columns "Name" and at least one of "Key" and "Ident".

Key is the R-tools session identifier (shown at the end of the url). Ident should be in format <page_id>/<code_name>.

Fetch first checks if the variable (or something with the same name) is already available, if it is nothing will be done. If Key is defined (not NA or "") for a variable it takes precedence over Ident.

Fetch is run as first part of ComputeDependencies.

See also: http://en.opasnet.org/

No return value. Fetched variables are written in .GlobalEnv.

T. Rintala teemu.rintala.a@gmail.com

deps <- data.frame(Name = "exposure", Key = "6WYTFxiZUIxiY8tw")
## Not run: 
Fetch(deps)
exposure

## End(Not run)

# If variable exists
exposure <- 1
Fetch(deps)
exposure # by default existing variables are not changed