My objective is to find a variable x which set the derivative of the function f (x) with respect to x to zero. The function f (x) is the integration of g(x, z) from a to b with respect to z., that is, f (x) = ∫g(x, z) dz over (a, b). The function g (x, z) is a well-behaved function that has one peak with respect to z. I used "intg" to calculate ∫g(x, z)dz. I used "numuderivatibe" to calculate f '(x) I used "fsoleve" to find x where f '(x) = 0.
When executed it, it stopped with the following warning. "fsolve: numderivative: Error while evaluating the function: "intg: Error: Round-off error detected, the requested tolerance (or default) cannot be achieved. Try using bigger tolerances." I would like to ask two questions. 1. Can I investigate the cause of rounding error by adding "disp" line in macros "numderivative" or "intg" in order to monitor the variables? 2. Where can I modify to increase the tolerances of "intg"? Thank you. -- Sent from: http://mailinglists.scilab.org/Scilab-users-Mailing-Lists-Archives-f2602246.html _______________________________________________ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
