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Any hint about this error?

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Chris
Chris 2013-7-16
Steps to reproduce (on Matlab R2013a 64bit Win machine):
R = rand(7,7);
>> ind_diag = eye(7);
>> R(ind_diag)
Error: Subscript indices must either be real positive integers or logicals.
>> ind_diag = ~~eye(7);
>> R(ind_diag)
ans =
0.8702
0.3818
0.6567
0.1098
0.4873
0.1401
0.7657
Cheers, Chris

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采纳的回答

Chris
Chris 2013-7-16
thank you Harjeet,
however i still wonder why eye() or ones() don't work.
Is it a bug or a misuse of these functions?

更多回答（2 个）

harjeet singh
harjeet singh 2013-7-16
use this
R = rand(7,7);
ind_diag = logical(eye(7));
R(ind_diag)
harjeet singh
harjeet singh 2013-7-16
eye() will give you a output in double format and when you use ~~eye() it automatically converts in logical.
the command R(ind_diag) uses inputs as logical so that's why you have to convert it into logical before use

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