string - R: get dataframe row with specific characters -

-



i need detect rows of df/tibble containing specific sequence of characters.

seq <- "rt @aventussystems" sequence

df <- structure(list(text = c("@aventussystems wow, upgrade of investor",  "rt @aventussystems: recent article our investors shown in forbes! t.co/n8ogwiedpu #aventus #globaladvisors #4thefans #ti…",  "@aventussystems nice have project", "rt @aventussystems: join #ticketrevolution #aventus today! #aventus #ticketrevolution #aventcoin #4thefans t.co/oplycfmw4a" ), tweet_id = c("898359464444559360", "898359342952439809", "898359326552633345",  "898359268226736128"), created_at = structure(c(17396, 17396,  17396, 17396), class = "date")), .names = c("text", "tweet_id",  "created_at"), row.names = c(na, -4l), class = c("tbl_df", "tbl",  "data.frame"))  select(df, contains(seq)) # tibble: 4 x 0

sapply(df$text, grepl, seq) return 4 false

what wrong? correct solution? thank help

first, grepl vectorized on argument x, don't need sapply. grepl(seq, df$text).

why code doesn't work sapply passes each element of x argument function in fun argument first argument (so looking search pattern "@aventussystems wow, upgrade of investor", etc. in seq object.

lastly, dplyr::select selects columns, whereas want use dplyr::filter, filters rows.





wiki

Comments

Post a Comment

Popular posts from this blog

Asterisk AGI Python Script to Dialplan does not work -

-
i'm stuck project have check database of sip extension incoming caller id , dial sip extension. below receive when run script on asterisk cli. -- registered sip '9125' @ 192.168.1.102:50142 > saved useragent "zoiper rv2.8.40" peer 9125 [2017-08-22 13:53:33] notice[5095]: chan_sip.c:24558 handle_response_peerpoke: peer '9125' reachable. (17ms / 2000ms) == using sip rtp tos bits 184 == using sip rtp cos mark 5 -- executing [0112617769@from-trunk:1] answer("sip/obitrunk1-0000000d", "") in new stack > 0x1ca50d0 -- probation passed - setting rtp source address 192.168.1.98:16834 -- executing [0112617769@from-trunk:2] agi("sip/obitrunk1-0000000d", "test.py") in new stack -- launched agi script /var/lib/asterisk/agi-bin/test.py args: ['/var/lib/asterisk/agi-bin/test.py'] env line: agi_request: test.py env line: agi_channel: sip/obitrunk1-0000000d env line: agi_language: en env line: a
Read more

python - Read npy file directly from S3 StreamingBody -

-
i have many .npy (numpy) , .json files saved in s3, need download , load these files. for json files downloading files , loading dictionary using following code: obj = s3.object(bucket, key) response = obj.get() body = response['body'].read().decode('utf-8') data = json.loads(body) that way avoid writing .json file disk , reading it. now want same .npy files, equivalent? currently downloading file, saving temp file on disk , loading np.load avoid if possible. following https://stackoverflow.com/a/28196540/3509999 : obj = s3.object(bucket, key) io.bytesio(obj.get()["body"].read()) f: # rewind file f.seek(0) arr = np.load(f) wiki
Read more

kotlin - Out-projected type in generic interface prohibits the use of metod with generic parameter -

-
i start using kotlin , defined interface this: interface aadapter<vh : recyclerview.viewholder> { fun oncreateaviewholder(parent: viewgroup): vh fun onbindaviewholder(v: vh, position: int) } and when try use on code: class klasa ( private val adapter: aadapter<*> ) { fun dosth(){ //... val vh = this.adapter.oncreateaviewholder(parent) //on below line error adapter.onbindaviewholder(v, position) //... } } i error out-projected type 'aadapter<*>' prohibits use of 'public abstract fun onbindaviewholder(v: t, position: int): unit i tied add "in" or "out" definition i'm confused. how allow it. replace aadapter<*> aadapter<recyclerview.viewholder> . class klasa ( private val adapter: aadapter<recyclerview.viewholder> ) { // ... because have declared aadapter has type parameter vh type subclass of recyclerview.
Read more