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J. M.'s missing motivation ♦
J. M.'s missing motivation ♦
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Post Closed as "Duplicate" by Mr.Wizard
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cormullion
cormullion
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numerical intstability Numerical instability in cosh and sinh - integral functions

I'm trying to calculate the function:

CoshIntegral[x] Sinh[x] - Cosh[x] SinhIntegral[x]

unfortunately mathematicaUnfortunately Mathematica seems to hit a point (x~20) and things become unstable (see plot below), there shouldn't be any infinities in the area, so I am rather confused as to what is going on!

plot of above function

Does anyone know why this is happening and how to fix it? Cheers, Jake

numerical intstability in cosh and sinh - integral functions

I'm trying to calculate the function:

CoshIntegral[x] Sinh[x] - Cosh[x] SinhIntegral[x]

unfortunately mathematica seems to hit a point (x~20) and things become unstable (see plot below), there shouldn't be any infinities in the area, so I am rather confused as to what is going on!

plot of above function

Does anyone know why this is happening and how to fix it? Cheers, Jake

Numerical instability in cosh and sinh - integral functions

I'm trying to calculate the function:

CoshIntegral[x] Sinh[x] - Cosh[x] SinhIntegral[x]

Unfortunately Mathematica seems to hit a point (x~20) and things become unstable (see plot below), there shouldn't be any infinities in the area, so I am rather confused as to what is going on!

plot of above function

Does anyone know why this is happening and how to fix it?

Tweeted twitter.com/#!/StackMma/status/411491808641032192
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Pinguin Dirk
Pinguin Dirk
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I'm trying to calculate the function:

CoshIntegral[x] Sinh[x] - Cosh[x] SinhIntegral[x]

CoshIntegral[x] Sinh[x] - Cosh[x] SinhIntegral[x]

unfortunately mathematica seems to hit a point (x~20) and things become unstable (see plot below), there shouldn't be any infinities in the area, so I am rather confused as to what is going on!

plot of above function

Does anyone know why this is happening and how to fix it? Cheers, Jake

I'm trying to calculate the function:

CoshIntegral[x] Sinh[x] - Cosh[x] SinhIntegral[x]

unfortunately mathematica seems to hit a point (x~20) and things become unstable (see plot below), there shouldn't be any infinities in the area, so I am rather confused as to what is going on!

plot of above function

Does anyone know why this is happening and how to fix it? Cheers, Jake

I'm trying to calculate the function:

CoshIntegral[x] Sinh[x] - Cosh[x] SinhIntegral[x]

unfortunately mathematica seems to hit a point (x~20) and things become unstable (see plot below), there shouldn't be any infinities in the area, so I am rather confused as to what is going on!

plot of above function

Does anyone know why this is happening and how to fix it? Cheers, Jake

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jake
jake
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