Import self-made Sage modules and functions into Sage script?

Let’s say that I have created a bunch of Sage code — Sage functions etc. — that I wish to reuse by importing into various Sage scripts. In straight Python, one would put these functions into their own separate file and import them using the usual from foo import funcname as localfuncname type procedure. It is unclear to me what the proper procedure for doing … Continue reading Import self-made Sage modules and functions into Sage script?

“ValueError: expected a DNF expression” when trying espresso_exprs example from pyeda docs

I’ve recently been working on a qualitative modelling project where I am trying to uncover “truths” about the response of species in an ecosystem to control of invasive species. Long story short, I’ve been looking into various boolean minimisation techniques. I’ve been playing with Python EDA, a Python library that I think provides a front-end to the Robert Brayton and Richard Rudell espresso heuristic logic … Continue reading “ValueError: expected a DNF expression” when trying espresso_exprs example from pyeda docs

Biodiversity versus ecosystem services

This is a brief summary of a debate about the relationship between biodiversity conservation (BD) and managing for ecosystem services (ES) and the proper role of conservation. The debate centers around an article by Kareiva and Marvier (2012) and the discussion that followed. Some threads of the discussion were: A reply by Soule (2013), followed by Marvier (2014), and those below. A reply by Miller … Continue reading Biodiversity versus ecosystem services

On phenology and bet-hedging

Environmental fluctuations may cause natural selection to favor phenologies that systematically deviate from the resource maximizing strategy. In temporally variable environments, because fitness is taken from the geometric (not arithmetic) mean growth rate (Gillespie, 1974), this permits the evolution of bet-hedging strategies (Simons, 2011), which are strategies that maximises total fitness by reducing temporal variation at the cost of arithmetic mean fitness (Ripa et al. … Continue reading On phenology and bet-hedging

The interesting case of blue tits in France

I’ve recently been reading about a several decade long study centred around blue tits in France and on the island of Corsica. The work is being carried out by a group in the evolutionary ecology unit at the Centre D’Ecologie Fonctionnelle & Evolutive and it crosses over all kinds of interesting areas of ecology and evolution. The mainland study area is dominated by deciduous habitat … Continue reading The interesting case of blue tits in France