On the suggestion by Hao Wang, I've created a new version of peakfit.m (version 5.7) that includes a minimum width constraint as the 13th input argument. Download from http://terpconnect.umd.edu/~toh/spectrum/beta/peakfit.m
See example 19 in this file for an example of this feature. The default, when not specified, is equal to the independent variable (x) increment. Feedback please.
24 Aug 2014
Command-line peak fitter for time-series signals. Version 5.7, September, 2014