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MathGroup Archive 1990

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rootfind problem...

  • To: mathgroup at yoda.ncsa.uiuc.edu
  • Subject: rootfind problem...
  • From: ccetinka at symcom.math.uiuc.edu (Cetin Cetinkaya)
  • Date: Fri, 2 Nov 90 02:00:03 GMT

Hi;

Could anybody tell me what I am doing wrong in the following Mathematica
session:

In[22]:= f[x_]:=NIntegrate[Sin[s],{s,0,x}]

In[23]:= FindRoot[f[y]==0,{y,-1}]

NIntegrate::lim: Numerical integration limits {s, 0, y} are not invalid.

NIntegrate::lim: Numerical integration limits {s, 0, s} are not invalid.

NIntegrate::vars: 
   Integration range specification #2 is not of the form {x, xmin, xmax}.

FindRoot::jnotnum: 
   Partial derivative of function 1 w.r.t. variable 1 is not numerical at 
                             (0.,1.)
    {-1.}={0., 0., NIntegrate       [Sin[s], {s, 0., -1.}]}
    . Try giving two starting values for each variable.

Out[23]= FindRoot[NIntegrate[Sin[s], {s, 0, y}] == 0, {y, -1}]

In[24]:= f[3]

Out[24]= 1.98999

Thank You,

C.Cetinkaya


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