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Re: Same .m file: different results with different versions of Octave
From: |
Thomas D. Dean |
Subject: |
Re: Same .m file: different results with different versions of Octave |
Date: |
Wed, 21 Apr 2010 16:04:16 -0700 |
Am I missing something?
sinhx = __ieee754_sinh (__real__ x);
coshx = __ieee754_cosh (__real__ x);
den = (sinhx*sinhx + cosix*cosix);
In maple,
solve(den = 0, x):
evalf(%,20)
den == 0 in ONE case:
.78539816339744830962*I
which is not real and we are using the real functions from libm.
plotting den shows a min at zero,
diff(den(x), x);
4 sinh(x) cosh(x)
solve(%=0,x)
0, pi/2*I
indicating a min of den at x=0, the only real value
limit(den(x), x = 0)
1
So, using real valued functions, den cannot be zero, I believe.
- Re: Same .m file: different results with different versions of Octave, (continued)
- 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 <=
- 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, 2010/04/21
- 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