Precision of fsolve

[Daniel Tourde]

Hello,

I am using the function fsolve like this :

  y(1) = 12*((x(3)*x(1))/2)/E - nlcoef(3);
  y(2) = 12*((x(3)*x(2)+x(1)*x(4))/6)/E - nlcoef(4);
  y(3) = 12*((P*x(3)/2+x(4)*x(2)+x(1)*x(5))/12)/E - nlcoef(5);
  y(4) = 12*((P*x(4)/2+x(5)*x(2))/20)/E - nlcoef(6); 
  y(5) = 12*((P*x(5))/60)/E - nlcoef(7);


Some of my nlcoef values are very small (between 1e-7 and 1e-10) and it
happens that the solutions send back by fsolve can be wrong due to
rounding and precision errors. 

My question is the following :

How can I increase the precision of fsolve, how can I lower the
admissible error ?


Thanks in advance for any answer

Best regards


                        Daniel Tourde
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Daniel TOURDE                                   E-mail : address@hidden
The Aeronautical Research Institute of Sweden   Tel : +46 8 634 13 44
P.O. Box 11021 S-161 11 BROMMA, Sweden          Fax : +46 8  25 34 81
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