Subscript indices must either be real positive integers or logicals.while using indexing

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want2know
want2know 2014-2-17
评论： want2know 2014-2-17
Hi all,
After performing some processing, now the variable 'a' contains [2 5 9].
Let say i have another variable 'b', variable 'b' is pre-initialized to be zero depending on a length of input, let say 10. b = [0 0 0 0 0 0 0 0 0 0];
What I want is, the elements that are stated in variable 'a' should be set ONE in variable 'b'. b= [0 1 0 0 1 0 0 0 1 0]
I did make sure variable 'a' contains only positive integers.
have added this line "a=round(a); b(a)=1;"
'a' can only be positive integers, I confirm and have checked.
I still I got the same error... Appreciate any idea, thanks

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采纳的回答

Mischa Kim
Mischa Kim 2014-2-17
Use clear all and then copy-paste-execute
a = [2 5 9];
b = [0 0 0 0 0 0 0 0 0 0];
b(a) = 1
Does that do the trick?
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更多回答（1 个）

Jos (10584)
Jos (10584) 2014-2-17
Are you sure they are positive and larger than zero ? … I am pretty sure they are not!
remove the semi-colon to see
a = round(a)
b(a) = 1
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want2know
want2know 2014-2-17
Thanks, sorry for my careless mistake, please forgive, there are zero which i overlooked.
As mentioned in the post, initially b = [0 0 0 0 0 0 0 0 0 0]; and variable 'a' is [2 5 9 0 0 0 0 0 0 0] after b(a)=1; variable 'b is now b= [0 1 0 0 1 0 0 0 1 0].
variable 'a' needs to be initialized with zeros at the beginning of m file, how could I avoid this? so that 'a' is [2 5 9] instead of [2 5 9 0 0 0 0 0 0 0]?

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