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Introduç˜ao `a´Algebra Linear com o gnu-Octave - Departamento de ...

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2.1.<br />

NOTAÇÃO MATRICIAL 13<br />

ans =<br />

2<br />

3<br />

Consi<strong>de</strong>re agora a matriz B =<br />

> B=[1 2-i 3i; 0 sqrt(2) -1]<br />

B =<br />

[<br />

1 2 − i 3i<br />

√<br />

]:<br />

0 2 −1<br />

1.00000 + 0.00000i 2.00000 - 1.00000i 0.00000 + 3.00000i<br />

0.00000 + 0.00000i 1.41421 + 0.00000i -1.00000 + 0.00000i<br />

No <strong>Octave</strong>, todas as constantes numéricas são representadas no formato <strong>de</strong> vírgula flutuante<br />

<strong>com</strong> dupla precisão (as constantes <strong>com</strong>plexas são memorizadas <strong>com</strong>o pares <strong>de</strong> valores <strong>de</strong> vírgula<br />

flutuante <strong>de</strong> dupla precisão). O <strong>Octave</strong>, por <strong>de</strong>feito, apenas mostra uma parte do valor que<br />

armazenou.<br />

> format long<br />

> B=[1, 2-i, 3i; 0, sqrt(2), -1]<br />

B =<br />

Column 1:<br />

1.000000000000000 + 0.000000000000000i<br />

0.000000000000000 + 0.000000000000000i<br />

Column 2:<br />

2.000000000000000 - 1.000000000000000i<br />

1.414213562373095 + 0.000000000000000i<br />

Column 3:<br />

0.000000000000000 + 3.000000000000000i<br />

-1.000000000000000 + 0.000000000000000i<br />

> format<br />

> B<br />

B =<br />

1.00000 + 0.00000i 2.00000 - 1.00000i 0.00000 + 3.00000i<br />

0.00000 + 0.00000i 1.41421 + 0.00000i -1.00000 + 0.00000i

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