Re: problem with acos

[zampala]

>
> | > Apparently your matrix P has some small imaginary components.  Try
> | >
> | >   format long
> | >   P
> | >
> | > so that they will be displayed.
> | 
> | I tried that, but still a long series of zero. However,
> | octave:39> isreal(P(1,2))
> | ans = 0
>
> What does
>
>   imag (P) == 0
>
> show you?
>
> jwe
>

This is what I get

octave:309> imag (P) == 0
ans =

   1   1
   1   1

I suppose the imaginary part is there, although small.
I'm wondering if setting a very small number to zero is correct and,
ultimately, this will affect my results on which I have no clue of what they
should look like
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