Re: imaginary unit

[Robert A. Macy]

Running the old binary 2.1.50a on Win98

>> for i=1:100;
>> x(i) = exp(1i*pi*( i/25 ));
>> endfor;

caused no problem

note mixing 1i and i through out.

             - Robert -

On Wed, 26 Apr 2006 14:33:18 -0400 (EDT)
 Przemek Klosowski <address@hidden> wrote:
> e^(i*pi) is the natural way of calculating vectors in
> complex
> plane. It failed for me, though, and I realized that I
> used the
> variable 'i' as a loop index, overwriting its original
> value of an
> imaginary unit vector, which octave assigns on startup to
> i,I, j,J.
> 
> octave:1> i,j,I,J
> i = 0 + 1i
> j = 0 + 1i
> I = 0 + 1i
> J = 0 + 1i
> 
> All of those variables can be overwritten:
> 
> octave:2> i=j=I=J=1;i,j,I,J
> i = 1
> j = 1
> I = 1
> J = 1
> 
> so the safe way to use them is to use 1i etc.
> 
> octave:3> 1i,1j,1I,1J
> ans = 0 + 1i
> ans = 0 + 1i
> ans = 0 + 1i
> ans = 0 + 1i
> 
> Perhaps the use of predefined 'i' should elicit a
> warning?