Cov txheej txheem:
Video: Koj yuav subset cov ntaub ntawv li cas?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2024-01-18 08:24
Yog li, txhawm rau rov hais dua, ntawm no yog 5 txoj hauv kev uas peb tuaj yeem teeb tsa cov ntaub ntawv hauv R:
- Subset siv brackets los ntawm rho tawm cov kab thiab kab peb xav tau.
- Subset siv cov brackets los ntawm kev tshem cov kab thiab kab peb tsis xav tau.
- Subset siv cov brackets ua ke nrog qhov twg () ua haujlwm thiab % hauv% tus neeg teb xov tooj.
- Subset siv cov subset () ua haujlwm.
Ntawm no, kuv yuav xaiv ib kem los ntawm Dataframe hauv R li cas?
Xaiv Cov Ntaub Ntawv Ncej kab hauv R
- rub(): Extract kem qhov tseem ceeb raws li vector.
- xaiv(): Extract ib lossis ntau kab ua ib lub rooj ntaub ntawv.
- select_if(): Xaiv kab raws li ib qho xwm txheej.
- Helper functions - starts_with(), ends_with(), contains(), matches(), one_of(): Xaiv cov kab/vaj huam sib luag raws li lawv lub npe.
Tsis tas li ntawd, Tibble yog dab tsi? A tib , los yog tbl_df, yog ib qho niaj hnub reimagining ntawm cov ntaub ntawv. Tibbles yog cov ntaub ntawv. thav duab uas tub nkeeg thiab tsis txaus ntseeg: lawv ua tsawg dua (piv txwv li lawv tsis hloov pauv lub npe lossis hom, thiab tsis txhob ua ib feem sib piv) thiab yws ntau dua (piv txwv li thaum tsis muaj qhov sib txawv).
Kuj paub, yog cov ntaub ntawv ncej hauv R?
Data frame yog ib ob seem cov ntaub ntawv qauv hauv R . Nws yog ib rooj plaub tshwj xeeb ntawm ib daim ntawv teev npe uas muaj txhua qhov sib npaug ntawm qhov ntev. Txhua feem tsim cov kab ke thiab cov ntsiab lus ntawm cov khoom sib xyaw ua cov kab.
Kuv yuav xaiv qee cov kab hauv Excel li cas?
Xaiv ib lossis ntau kab thiab kab
- Xaiv tsab ntawv nyob rau saum toj kom xaiv tag nrho kem. Los yog nyem rau ntawm ib qho ntawm tes hauv kab thiab tom qab ntawd nias Ctrl + Chaw.
- Xaiv tus naj npawb kab los xaiv tag nrho kab.
- Txhawm rau xaiv kab lossis kab uas nyob ib sab, tuav Ctrl thiab xaiv kab lossis kab zauv.
Pom zoo:
Kuv yuav hloov cov ntaub ntawv tab delimited rau cov ntaub ntawv csv li cas?
Mus rau cov ntawv qhia zaub mov, xaiv 'OpenCSVTab-Delimited File' (lossis tsuas yog nias Ctrl + O), thiab tom qab ntawd los ntawm lub thawv qhib, xaiv cov ntaub ntawv tab-delimited qhib. Koj tuaj yeem luam cov tab-delimited txoj hlua mus rau clipboard thiab tom qab ntawd siv 'Qhib Cov Ntawv Hauv Cov Ntawv Teev Npe' xaiv (Ctrl + F7)
Kuv yuav ua li cas thiaj tsim tau ZIP cov ntaub ntawv nrog ntau cov ntaub ntawv?
Muab ob peb cov ntaub ntawv mus rau hauv ib qho zippedfolder kom yooj yim sib faib ib pawg ntawm cov ntaub ntawv. Nrhiav cov ntaub ntawv lossis nplaub tshev uas koj xav zip. Nias thiab tuav (lossis right-click) cov ntaub ntawv lossis ntawv tais ceev tseg, xaiv (lossis taw tes rau) Xa mus rau, thiab tom qab ntawd xaiv Compressed (zipped) folder
Vim li cas kem taw qhia cov ntaub ntawv khaws cia ua cov ntaub ntawv nkag ntawm disks sai dua li kab qhia cov ntaub ntawv khaws cia?
Kem oriented databases (aka columnar databases) yog qhov tsim nyog rau kev ntsuas kev ua haujlwm ntau dua vim tias cov ntaub ntawv hom ntawv (kem hom) qiv nws tus kheej kom nrawm dua cov lus nug ua - scans, aggregation thiab lwm yam. Ntawm qhov tod tes, kab oriented databases khaws ib kab (thiab tag nrho nws. kab) contiguously
Dab tsi VM Series koj yuav tsum xav txog yog tias koj xav tau cov ntawv thov host uas xav tau kev ua haujlwm siab IO rau cov ntaub ntawv tsis tu ncua?
Teb: VM series uas koj yuav tsum yog xav txog yog tias koj xav tau txais cov ntawv thov uas xav tau kev ua haujlwm siab rau cov ntaub ntawv tsis tu ncua yog VMware workstation, Oracle VM virtual box lossis Microsoft Azure suav. Cov khoom siv no muaj qhov yooj yim tshaj plaws ntawm kev ua haujlwm hosting
Kuv yuav ntxig cov ntaub ntawv WAV rau hauv cov ntaub ntawv Word li cas?
Ntxig ib lub suab ntaub ntawv rau hauv koj cov ntaub ntawv txoj hauj lwm qhov ntxig taw tes uas koj xav kom lub soundinserted. Xaiv Object los ntawm Insert. Worddisplays Object dialog box. Nyem rau ntawm Tsim los ntawm Cov Ntaub Ntawv tab. (Saib daim duab 1.) Siv cov kev tswj ntawm lub dialog box los nrhiav cov ntaub ntawv suab uas koj xav tau nrog rau koj cov ntaub ntawv. Nyem rau OK