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Web skærmformat. - Aarhus Universitet

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V. Matricer – 1. Vektorer og matricer 369<br />

Sum af vektorer<br />

⎛ ⎞ ⎛ ⎞ ⎛ ⎞<br />

x1 y1 x1 + y1<br />

⎜<br />

x + y = ⎝ .<br />

⎟ ⎜<br />

. ⎠ + ⎝ .<br />

⎟ ⎜<br />

. ⎠ = ⎝ .<br />

⎟<br />

. ⎠<br />

Eksempel ⎛ ⎞<br />

1<br />

⎛ ⎞<br />

4<br />

⎛ ⎞<br />

5<br />

⎝2⎠<br />

+ ⎝5⎠<br />

= ⎝7⎠<br />

3 6 9<br />

xn<br />

yn<br />

xn + yn<br />

1.6. Skalering<br />

Definition<br />

☞ [LA] 1 Koordinatvektorer<br />

Skalarmultiplikation af skalar (tal) og vektor<br />

⎛ ⎞ ⎛ ⎞<br />

Eksempel<br />

⎜<br />

αx = α ⎝<br />

x1<br />

.<br />

xn<br />

⎟<br />

⎠ =<br />

⎜<br />

⎝<br />

⎛ ⎞ ⎛ ⎞<br />

1 3<br />

3⎝2⎠<br />

= ⎝6⎠<br />

3 9<br />

αx1<br />

.<br />

αxn<br />

⎟<br />

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