Description Usage Arguments Value Examples
Count the number of results for a given search. Useful to check before attempting to pull down a very large number of records.
1 | clinicaltrials_count(query = NULL)
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query |
Search pattern as a string; a vector of key-value pairs is interpreted as an advanced search and is therefore combined with '&' |
Number of results (integer).
1 2 3 4 5 6 7 8 | # count trials satisfying 'heart disease AND stroke AND California'
## Not run: clinicaltrials_count(query = 'heart disease AND stroke AND California')
# advanced search for open, interventional trials involving melanoma
## Not run: clinicaltrials_count(query = c('recr=Open', 'type=Intr', 'cond=melanoma'))
# can also use a named list
## Not run: clinicaltrials_count(query = list(recr='Open', type='Intr', cond='melanoma'))
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