Video: Dab tsi yog qhov scalar tivthaiv ntawm vector?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov scalar x- ib feem ntawm vector tuaj yeem nthuav tawm raws li cov khoom ntawm nws qhov loj me nrog lub cosine ntawm nws lub kaum sab xis, thiab cov scalar y- tiv thaiv tuaj yeem nthuav tawm raws li cov khoom ntawm nws qhov loj me nrog lub sine ntawm nws lub kaum sab xis. Hauv ib lub dav hlau, muaj ob qhov sib npaug sib npaug.
Tib neeg kuj nug, dab tsi yog lub ntsiab lus ntawm vector?
Hauv physics, thaum koj tawg a vector nyob rau hauv nws qhov chaw, cov seem yog hu ua nws cov khoom . Piv txwv li, nyob rau hauv lub vector (4, 1), x-axis (kab rov tav) tiv thaiv yog 4, thiab y-axis (nruab nrab) tiv thaiv yog 1.
Koj txhais li cas ib chav vector? A unit vector yog a vector ntawm qhov ntev 1, qee zaum kuj hu ua kev taw qhia vector (Jefreys thiab Jeffreys 1988). Cov unit vector muaj kev taw qhia tib yam li qhov muab (nonzero) vector yog txhais los ntawm. qhov twg denotes tus qauv ntawm, yog tus unit vector nyob rau hauv tib txoj kev raws li qhov (finite) vector.
Dab tsi yog scalar thiab vector projections?
Cov vector projection ntawm a vector mus rau ib qho kev taw qhia muaj qhov sib npaug ntawm qhov scalar qhov projection . A scalar qhov projection yog qhov ntev ntawm cov vector projection . Nws yog muab los ntawm cov khoom dot ntawm a vector nrog ib unit vector rau qhov kev taw qhia ntawd.
Lub sij hawm vector yog dab tsi?
Hauv kev kawm tob, txhua yam yog vectorized, los yog hu ua kev xav vector los yog lus vector , thiab ces lub complex geometry transformation yog ua nyob rau hauv lub cov duab . Hauv Lucene's JAVA Doc, lus vector txhais tau tias "A lus vector yog ib daim ntawv teev cov ntaub ntawv nqe lus thiab lawv cov naj npawb ntawm qhov tshwm sim hauv daim ntawv ntawd."
Pom zoo:
Yuav ua li cas koj nrhiav tau daim ntawv tivthaiv ntawm ib vector muab qhov magnitude thiab lub kaum sab xis?
VIDEO Khaws qhov no hauv kev xav, puas yog 0 ib chav vector? A unit vector yog a vector uas muaj qhov loj ntawm 1. Cov ntawv sau sawv cev rau tus qauv, lossis qhov loj, ntawm vector v. Basic unit vectors yog i = (1, 0 ) thiab j = ( 0 , 1) uas yog ntev 1 thiab muaj cov lus qhia raws qhov zoo x-axis thiab y-axis feem.
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