Modified class trunc_expon to include both _pdf and _cdf so that self.a doesn't have to be explicitly specified. Now self.ppf and self.rvs both work.
Modified class trunc_expon to include both _pdf and _cdf so that self.a doesn't have to be explicitly specified. Now self.ppf and self.rvs both work.

rueuntal/macroecotools,davharris/macroecotools,rueuntal/macroecotools,weecology/macroecotools,weecology/macroecotools