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Differential Algebraic Equation

Posted 9 years ago
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POSTED BY: Shivi Sv
5 Replies

Hi,

what is f[zeta]? This function is not defined.

Suvadip.

POSTED BY: suvadip mandal
Posted 9 years ago
POSTED BY: Shivi Sv
POSTED BY: David Vasholz
Posted 9 years ago

Perhaps I have misunderstood some part of your attachement.

If I replace your NDSolve and the plots that follow it with this

f = First[f/.NDSolve[{f''[\[Xi]]-1/f[\[Xi]]^3+1/eo f[\[Xi]] phir[\[Xi]] 10^7==0, f[0]==1, f'[0]==0}, f,{\[Xi],0,1}]];
Plo], {\[Xi], 0, 1},
   AxesOrigin->{0,0}, PlotStyle->{Thickness[0.006]}, AxesLabel->{\[Xi]}, PlotRange->All]

then it seems to find the desired function f and it then uses that f to evaluate your next expression.

I am concerned that in your attachment you seem to want that next expression to equal zero, but from the second plot that does not seem possible.

If I have made some mistake and you can explain what that was then I will see if I can correct it.

POSTED BY: Bill Simpson
Posted 9 years ago
POSTED BY: Shivi Sv
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