Hi. Let be a spectral density curve as a function of the frequency of ohms:
If om and Pow are numeric arrays (of the same length) of [150-400] and [1800-2600], then
Pow=Pow(om); Pow 1=Pow-0.2;
The desired points are zeros of the Pow1 function. This feature is nice, smooth, and won't
you can approximate it in the Curve Fitting Toolbox. Get ApproPow(om)
- a continuous function of its argument.
Next: omStar=fzero(Apropos, omNearOmStar);
omNearOmStar is a certain point in the neighborhood of exactly unknown
zero of the Pow1 function. Repeat this procedure 4 times.
If you execute this method in the form of routines that can be done automatically.
There are many methods for solving Your problem.
It is better to solve this problem in Symbolic Toolbox-it is simple and more beautiful.