matrix indexing

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

Answer 1

[David Young]

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.

[deji]

F = [ 2 3 1 0 2 1 1 1 0 0 3 2 1 3 2 3 1 0 2 0]

[Daniel Shub]

Look at that, F has a value that is not a real positive integer (i.e., the zeros). You probably want F+1.

[deji]

thanks.. it worked