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