Extracting matrix diagonal with diag(A)

Irina 님이 질문을 제출함. 19 Feb 2015

최근 활동 Irina 님이 댓글을 추가함. 19 Feb 2015

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A simple function that used to run now gives an error message. What am I doing wrong?

>> a = eye(4,4);
>> diag(a)
Subscript indices must either be real positive integers or logicals.
>>

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Evan 님의 답변 19 Feb 2015

Evan 님이 편집함. 19 Feb 2015

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Does this fix your problem?

a = eye(4,4) == 1;
diag(a)

While the diag function works fine, if you have a variable named diag (not a good idea--give it a unique name that isn't the same as a builtin function), it expects a logical, not double, input for indexing.

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Irina 19 Feb 2015

Thank you, that's exactly what happened.

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Erik S. 님의 답변 19 Feb 2015

Do you have another matrix in your workspace called diag?

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Irina 19 Feb 2015

Thank you, that's exactly what happened.

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