denis-bz

Cosmopy: clip and regrid COSMO_REA6 wind data to python numpy

Keywords: Cosmo_rea6 DWD wind-data python numpy

Purpose: DWD, the German Meteorological Service, has wind data for Europe on a 6 x 6 km grid, from 1995 to August 2019, hourly, at heights 10 100 .. 200m. These are in 2 gigabyte files like
https://opendata.dwd.de/climate_environment/REA/COSMO_REA6/converted/hourly/2D/WS_100m.2D.201908.nc4
-- windspeed data at 100m for 2019 August.

denis-bz

N-dimensional test functions for optimization, in Python.

These are the n-dim Matlab functions by A. Hedar (2005), translated to Python-numpy.
http://www-optima.amp.i.kyoto-u.ac.jp/member/student/hedar/Hedar_files/TestGO.htm
ackley dp griew levy mich perm powell power rast rosen schw sphere sum2 trid zakh .m + ellipse nesterov powellsincos

http://imgur.com/Iu9H0jk is a plot of 3 no-derivative algorithms, NLOpt LN_BOBYQA LN_PRAXIS LN_SBPLX,

denis-bz

""" a simple example of ILC
    from Moore, Iterative learning control: a tutorial and big picture 2006 6p
"""
# https://en.wikipedia.org/wiki/Iterative_learning_control
# https://en.wikipedia.org/wiki/LTI_system_theory


from __future__ import division
import sys
import numpy as np

denis-bz

How shift-invert finds eigenvalues, in pictures

Keywords: eigenvalues, eigenvectors, shift-invert, ARPACK, scipy, python

Pictures first:

Background

denis-bz

Old mst.py with Kruskal's algorithm

mst.py is simple old (2011) code for MSTs using Kruskal's algorithm -- see the animation there.

Kleinberg-Tardos:

single-link k-clustering == MST k-1 most expensive edges

but min( max spacing ), Theorem 1, may be wrong or at least odd for k-clustering ?

denis-bz

Windspeeds in Bayern, COSMO_REA6 vs. ERA5

Here are plots of average windspeeds in Bayern in January 2018 at 100m,
COSMO_REA6 on its ~ 6 × 6 km grid
ERA5 on its 0.25° × 0.25° grid.
We see big differences over the Alps in the south and over hilly areas in north Bayern.

denis-bz

How to make a Python package for other people to use

Keywords, tags: python packaging setup.py setuptools

Purpose: describe how to make a "package" of a Python program for other people to use. This introduction builds on the excellent oa-packaging-guide-preview.readthedocs.io — read that first.

denis-bz

#!/usr/bin/env python
''' In: a firefox cookies.sqlite file
    	default $HOME/Library/Application\ Support/Firefox/Profiles/*/cookies.sqlite
    Out: urls in the file, one per line on stdout

modified https://linuxfreelancer.com/decoding-firefox-cookies-sqlite-cookies-viewer
'''
	# google python sqlite3 "delete cookies" ? looks mttiw

denis-bz

Wind speeds at 100m in Bayern, ERA5 vs. globalwindatlas

Keywords: wind power, Germany, python, ERA5, globalwindatlas

Purpose: look at windspeed estimates at 100m in Bayern from two different sources:
ERA5: https://confluence.ecmwf.int/display/CKB/ERA5
GWA: https://globalwindatlas.info/area/Germany/Bayern

denis-bz

How efficient are wind, sun, biomass in the German provinces in 2019 - 2020 ?

Keywords: Renewable energy, wind energy, electricity, Germany

Purpose: look at the efficiency of electricity produced in the German provinces from sun, wind and biomass, with files from official data:
LAK, real: https://www.lak-energiebilanzen.de 2019, Länderarbeitskreis Energiebilanzen Bruttostromerzeugung nach Erneuerbaren Energieträgern
BMWK, max 31.12.2020,