Video: Puas yog vector ib kab lossis kab?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Vectors yog hom matrix muaj ib qho xwb kem los yog ib kab . A vector muaj ib leeg xwb kem npe a kab vector , thiab a vector muaj ib leeg xwb kab npe a kab vector . Piv txwv li, matrix a yog a kab vector , thiab matrix a' yog a kab vector . Peb siv cov ntawv me me, cov ntawv boldface los sawv cev kab vectors.
Yog li ntawd, kab yog dab tsi Dab tsi yog kab?
A kab yog qhov koj tau nkag mus rau thaum tus nyeem ntawv tsis pom zoo nrog koj lub tswv yim lossis txo koj cov kev paub dhau los. Xwb, hauv ib lub rooj (uas kuv xav tias koj tab tom hais txog), kab yog "kab rov tav" collections ntawm cov khoom uas muaj nyob rau hauv ib qeb; kab yog "verttical" collections.
Ib yam li ntawd, kab thiab kab matrix yog dab tsi? A matrix nrog m kab thiab n kab npe m×n matrix lub m-by-n matrix , thaum m thiab n yog hu ua nws qhov ntev. Piv txwv li, lub matrix A saum toj no yog 3 × 2 matrix . Matrices nrog ib leeg kab hu ua kab vectors, thiab cov uas muaj ib leeg kem hu ua kem cov duab.
Tsis tas li ntawd, kab vector txoj cai yog dab tsi?
Yuav muab ntau a kab vector los ntawm ib kab vector , cov kab vector yuav tsum muaj ntau li cov kab asthe kem vector muaj kab. Yog tias peb cia Ax = b, ces b yog anm × 1 kab vector . Hauv lwm lo lus, tus naj npawb ntawm rowsin A txiav txim siab tus naj npawb ntawm kab hauv cov khoom b.
Puas yog vectors ntsug lossis kab rov tav?
Peb siv ob cov duab ntawm qhov ntev 1 (ib chav nyob hauv qhov kev sib koom tes), ib qho ntsug thiab ib kab rov tav . Cov no cov duab hu ua unit cov duab thiab feem ntau yog sau li ( kab rov tav thiab yog li ntawd parallel rau lub xaxis) thiab (parallel rau lub y axis).
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