Extracting matrix diagonal with diag(A)

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Irina
Irina 2015-2-19
评论： Irina 2015-2-19
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
Evan 2015-2-19
编辑：Evan 2015-2-19
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.

更多回答（1 个）

Erik S.
Erik S. 2015-2-19
Do you have another matrix in your workspace called diag?

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