Re: Invalid index error

[Geraint Paul Bevan]

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Rich Shepard wrote:

| Geraint,
|
|   Perhaps my manual edition is out of date. I read on page 177:
|
| prod (x)  # There's only a single parameter, you used two parameters.
|
| "... For a matrix argument, return the product of the elements in each
| _column_ as a row vector."
|
|   I need the products of each row.
|
|   Also, I need to calculate the 6th root (since there are 6 elements
in each
| row) of that product, then normalize the elements by dividing them by that
| root. I used **-6 because I do not find a function to extract the nth root
| of a value. Is this the proper way?
|
| Thanks,
|
| Rich
|

Perhaps you still have the manual from 2.1.35 installed? If you type
'help prod' it should tell you about the second argument which sets the
dimension. Even if the second argument didn't exist, you could achieve
the same result with "prod(a')", where ' is the transpose operator.

To get the sixth root, you should use the ^ operator:

octave:1> 729^(1/6)
ans = 3

- --
Geraint Bevan
http://homepage.ntlworld.com/geraint.bevan
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