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Web skærmformat. - Aarhus Universitet

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V. Matricer – 1. Vektorer og matricer 377<br />

I cik indgår kun den i-te række i første matrix og den k-te søjle i anden matrix.<br />

⎛ ⎞<br />

cik = ⎜<br />

⎜<br />

ai1 ...aij ...ain ⎜<br />

⎝<br />

b1k<br />

.<br />

bjk<br />

.<br />

bnk<br />

⎟<br />

⎠<br />

= ai1b1k + · · · + aijbjk + · · · + ainbnk<br />

1.20. Øvelse ☞ [LA] 2 Matricer<br />

Eksempel <br />

1<br />

<br />

2 3<br />

<br />

−5<br />

−1 8 4 0<br />

<br />

[1 · 3 + 2 · 4]<br />

=<br />

[(−1) · 3 + 8 · 4]<br />

<br />

[1 · (−5) + 2 · 0]<br />

[(−1) · (−5) + 8 · 0]<br />

<br />

11<br />

=<br />

29<br />

<br />

−5<br />

5<br />

1.21. Regneark ☞ [LA] 2 Matricer

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