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Re: Same .m file: different results with different versions of Octave
From: |
Judd Storrs |
Subject: |
Re: Same .m file: different results with different versions of Octave |
Date: |
Wed, 21 Apr 2010 19:16:39 -0400 |
On Wed, Apr 21, 2010 at 7:04 PM, Thomas D. Dean <address@hidden> wrote:
> So, using real valued functions, den cannot be zero, I believe.
The naming convention used in the file is confusing, but we kept it
for consistency. The use "x" to mean the real part of "x" and "ix" to
mean the imaginary part of x. :)
In other words if x = a + b*i then
sinhx = sinh(a)
cosix = cos(b)
So
den = (sinhx*sinhx + cosix*cosix);
is zero when both sinhx and cosix are zero.
sinhx is zero for a==0.
cosix is zero for pi/2 + n*pi
On the other hand, pi is transcendental and can't be represented as
floats. But in theory, since they are squared, both could underflow
after squaring (i.e. become closer to zero than the closest floating
point number that is not zero and be rounded/truncated to zero).
--judd
- Re: Same .m file: different results with different versions of Octave, (continued)
- Re: Same .m file: different results with different versions of Octave, Judd Storrs, 2010/04/20
- Re: Same .m file: different results with different versions of Octave, Jaroslav Hajek, 2010/04/21
- Re: Same .m file: different results with different versions of Octave, Thomas D. Dean, 2010/04/20
- Re: Same .m file: different results with different versions of Octave, Judd Storrs, 2010/04/21
- Re: Same .m file: different results with different versions of Octave, Jaroslav Hajek, 2010/04/21
- Re: Same .m file: different results with different versions of Octave, Judd Storrs, 2010/04/21
- Re: Same .m file: different results with different versions of Octave, Judd Storrs, 2010/04/21
- Re: Same .m file: different results with different versions of Octave, Thomas D. Dean, 2010/04/21
- Re: Same .m file: different results with different versions of Octave, Thomas D. Dean, 2010/04/21
- Re: Same .m file: different results with different versions of Octave, Ozzy Lash, 2010/04/21
- Re: Same .m file: different results with different versions of Octave,
Judd Storrs <=
- Re: Same .m file: different results with different versions of Octave, Jaroslav Hajek, 2010/04/22
- Re: Same .m file: different results with different versions of Octave, Thomas D. Dean, 2010/04/21
- Re: Same .m file: different results with different versions of Octave, Thomas D. Dean, 2010/04/21
- Re: Same .m file: different results with different versions of Octave, Judd Storrs, 2010/04/21
- Re: Same .m file: different results with different versions of Octave, Thomas Weber, 2010/04/19
- Re: Same .m file: different results with different versions of Octave, Francesco Potortì, 2010/04/19
- Re: Same .m file: different results with different versions of Octave, Jaroslav Hajek, 2010/04/19
- Re: Same .m file: different results with different versions of Octave, Francesco Potortì, 2010/04/19
- Re: Same .m file: different results with different versions of Octave, perseu.as, 2010/04/18
- Re: Same .m file: different results with different versions of Octave, Stuart Edwards, 2010/04/18