       Problem to evaluate a function inside a function

• To: mathgroup at smc.vnet.net
• Subject: [mg64156] Problem to evaluate a function inside a function
• From: Stéphane Fay <steph.fay at gmail.com>
• Date: Thu, 2 Feb 2006 19:09:08 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

```Dear everyone,

I have defined a function chi2[¦¸m_, ¦Í_, ¦£_, data_] and when I compute
chi2[0.27, -0.1, 0.1, data], it works well and I find 183.987. Now I
try to find the minimum of this function by writting

FindMinimum[chi2[¦¸m, ¦Í,  ¦£, data], {{¦¸m, 0.25, 0.30}, {¦Í, -0.1, 0.2},
{¦£, 0.1, 0.2}}]

and get the error message

NDSolve::ndnum: Encountered non-numerical value for a derivative at z == 0.`.

Apparently the problem is the folowwing:

Inside my function chi2[¦¸m_, ¦Í_, ¦£_, data_] I have another function
ePhip[¦¸mp_, ¦Íp_, ¦£p_] that I try to compute with ePhi = ePhip[¦¸m, ¦Í,
¦£] but Mathematica do not evaluate ¦¸m, ¦Í and ¦£ in ePhip and thus get a
non numerical value.

I tried to solve the problem by using Evaluate or writing
ePhip[¦¸mp_?NumericQ, ¦Íp_?NumericQ, ¦£p_?NumericQ] but nothing works.

Does anybody has a solution?

Thank you very much for your help

Yours sincerely

St¨¦phane

```

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