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Remove existing values from an IPUMS NHGIS extract definition. All fields are optional, and if omitted, will be unchanged.
This function is marked as experimental because it is typically not the best
option for maintaining reproducible extract definitions and may be retired
in the future. For reproducibility, users should strive to build extract
definitions with define_extract_nhgis()
.
If you have a complicated extract definition to revise, but do not have
the original extract definition code that created it, we suggest that you
save the revised extract as a JSON file with save_extract_as_json()
. This
will create a stable version of the extract definition that
can be used in the future as needed.
To add new values to an IPUMS NHGIS extract definition, use
add_to_extract()
.
Learn more about the IPUMS API in vignette("ipums-api")
.
# S3 method for nhgis_extract
remove_from_extract(
extract,
datasets = NULL,
time_series_tables = NULL,
geographic_extents = NULL,
shapefiles = NULL,
...
)
A modified nhgis_extract
object
An ipums_extract
object.
Dataset specifications to remove from the extract definition.
All data_tables
, geog_levels
,
years
, and breakdown_values
associated with the specified
datasets
will also be removed.
Names of the time series tables
to remove from the extract definition. All geog_levels
and years
associated with the specified time_series_tables
will also be removed.
Geographic extents to remove from the extract definition.
Shapefiles to remove from the extract definition.
Ignored
Any extract fields that are rendered irrelevant after modifying the extract
will be automatically removed. (For instance, if all time_series_tables
are removed from an extract, tst_layout
will also be
removed.) Thus, it is not necessary to explicitly remove these values.
If the supplied extract definition comes from a previously submitted extract request, this function will reset the definition to an unsubmitted state.
add_to_extract()
to add values
to an extract definition.
submit_extract()
and download_extract()
to submit and process an
extract request.
define_extract_nhgis()
to create a new extract definition.
extract <- define_extract_nhgis(
datasets = ds_spec(
"1990_STF1",
data_tables = c("NP1", "NP2", "NP3"),
geog_levels = "county"
),
time_series_tables = list(
tst_spec("CW3", c("state", "county")),
tst_spec("CW5", c("state", "county"))
)
)
# Providing names of datasets or time series tables will remove them and
# all of their associated specifications from the extract:
remove_from_extract(
extract,
time_series_tables = c("CW3", "CW5")
)
# To remove detailed specifications from a dataset or time series table,
# use `ds_spec()` or `tst_spec()`. The named dataset or time series table
# will be retained in the extract, but modified by removing the indicated
# specifications:
remove_from_extract(
extract,
datasets = ds_spec("1990_STF1", data_tables = c("NP2", "NP3"))
)
# To make multiple modifications, use a list of `ds_spec()` or `tst_spec()`
# objects:
remove_from_extract(
extract,
time_series_tables = list(
tst_spec("CW3", geog_levels = "county"),
tst_spec("CW5", geog_levels = "state")
)
)
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