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MathGroup Archive 2004

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RE : how can I solve a function Erfc

  • To: mathgroup at smc.vnet.net
  • Subject: [mg48425] RE : [mg48396] how can I solve a function Erfc
  • From: "Florian Jaccard" <florian.jaccard at eiaj.ch>
  • Date: Sat, 29 May 2004 03:06:46 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Bonjour !

Est-ce que cela te va ?

In[7]:=
Information["Erfc", LongForm -> False]

"Erfc[z] gives the complementary error function erfc(z)

In[8]:=
Information["InverseErfc", LongForm -> False]

"InverseErfc[s] gives the inverse complementary error \
function obtained as the solution for z in s = erfc(z)

In[9]:=
L/(4*(Dg*t)^(1/2)) == InverseErfc[0.9]

In[10]:=
Solve[{%, Dg == 5*10^5}, t]

In[11]:=
Plot[%[[1,1,2]], {L, -10, 10}]

Meilleures salutations
 
F.Jaccard


-----Message d'origine-----
De : aude [mailto:montgermont.aude at ec-lille.fr] 
Envoyé : vendredi, 28. mai 2004 06:50
À : mathgroup at smc.vnet.net
Objet : [mg48396] how can I solve a function Erfc

Hi,

I have to solve this function:

Erfc[L/(4*(Dg*t)^(1/2))]= 0.9

Dg is constant.

Dg=5*10^5

I want to plot t as a function of L.

thanks.

aude




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