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Web skærmformat. - Aarhus Universitet

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V. Matricer – 1. Vektorer og matricer 376<br />

Eksempel <br />

1 2<br />

+<br />

−1 8<br />

λA = (λaij)i=1...m,j=1...n<br />

<br />

1 2<br />

=<br />

−1 8<br />

<br />

2 4<br />

= 2<br />

−2 16<br />

<br />

1<br />

<br />

2<br />

−1 8<br />

1.18. Matrix multiplikation ☞ [LA] 2 Matricer<br />

Definition (Multiplikation)<br />

En m × n-matrix og en n × p-matrix kan multipliceres (ganges sammen) til en m × p-matrix.<br />

A = (aij)i=1...m,j=1...n<br />

B = (bjk)j=1...n,k=1...p<br />

AB = (cik)i=1...m,k=1...p<br />

cik = ai1b1k + · · · + ainbnk =<br />

n<br />

j=1<br />

aijbjk<br />

1.19. Gange er nemt ☞ [LA] 2 Matricer<br />

Bemærkning

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