matrix indexing

Question

deji 2011-11-16

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/21348-matrix-indexing

采纳的回答： David Young

hi,

I av dis lines of code i'm trying to run. qpsk = [q1 q2 q3 q4];

index = [0 1 2 3]

A = qpsk(F)

F is an array with a single row with elements matching the index.

Any time i try to run it, i get an error message saying "Subscript indices must either be real positive integers or logicals." Pls wat am i doing wrong and how do i correct it?

Thanks in advance

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Answer 1

David Young 2011-11-16

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/21348-matrix-indexing#answer_28113

It is because the vector F is not logical and contains an element that is not a real positive integer.

Note that in MATLAB indices for vectors and matrices start from 1, not zero. So your vector index=[0 1 2 3] would not be useful as an index vector, because it contains zero. However, as you don't appear to use index, I'm not sure why you tell us its value.

To get detailed help, you need to tell us exactly what the value of F is, or how it is generated.