Keywords: color-space HUSL HSLuv CIELCh CIELuv CIELab max-chroma everyone-knows
Whenever something can be done in two ways, someone will be confused.
There are two quite different color spaces: \
denis-bz
/ 0-HUSL-lch-is-not-CIELCh.md
Last active
March 26, 2022 14:29
HUSL rgb_to_lch is not CIELCh
denis-bz
/ 0-Windfarms-in-Germany.md
Last active
July 23, 2022 09:28
Windfarms in Germany, from de.wikipedia 14 Nov 2021
Keywords: wind power, Germany, python, globalwindatlas
Purpose: collect data on wind farms in Germany in a single .csv file, from https://de.wikipedia.org/wiki/Liste_von_Windkraftanlagen_in_Bayern etc.
The file windfarms-in-Germany.csv looks like this:
MW MW/Rad Nrad Year N E Land Lkr Typ Ort
Keywords: image raster resize rescale reproject Manhattan-grid regular-grid
We have a picture (image, raster) A, an array of colored pixels,
and want to warp it to a new picture O of a different size or shape.
Examples:
Map projection, flat maps <-> globe;
Image scaling.
There are hundreds of cases of these, and zillions of programs
denis-bz
/ 0-warp_raster_test.md
Last active
September 13, 2021 11:02
rioxarray reproject UTM -> 4326 widens NaNs at the sides 13 Sep 2021
Keywords: rioxarray, rasterio, reproject, geotiff, testcase
This plot shows that rioxarray reproject UTM -> 4326, middle -> right, widens NaNs at the sides:
denis-bz
/ 0-German-energy.md
Last active
July 12, 2021 12:32
Electricity in Germany from coal, wind etc.
Keywords: electricity, Germany, renewable, wind, python, pandas
Purpose: summarize data on electricity sources in Germany from the electricity market site smard.de:
total 502489 GWh 365 days, 2020-07-01 .. 2021-06-30:
GWh % GW
Braunkohle 96253.2 19.2 11.0
denis-bz
/ rki_excel.py
Created
June 10, 2021 14:43
Read German Corona data rki.de/.../Fallzahlen_Kum_Tab.xlsx in python pandas
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| #!/usr/bin/env python3 | |
| """ https://www.rki.de/DE/Content/InfAZ/N/Neuartiges_Coronavirus/Daten/Fallzahlen_Kum_Tab.html .xlsx | |
| -> python pandas read_excel | |
| """ | |
| # sheets, from openpyxl -- | |
| # 0 Erlaeuterungen 20 rows 1 cols | |
| # 1 Fälle-Todesfälle-gesamt 509 rows 16384 cols ?! | |
| # 2 BL_7-Tage-Fallzahlen (fixiert) 39 rows 396 cols | |
| # 3 BL_7-Tage-Inzidenz (fixiert) 21 rows 396 cols | |
| # 4 LK_7-Tage-Fallzahlen (fixiert) 419 rows 207 cols |
denis-bz
/ 0-fitting-1-over-x-with-polynomials.md
Last active
February 28, 2022 19:19
Fitting 1 / x with polynomials in relative error
denis-bz
/ 0-tri101-inverse.md
Last active
April 3, 2021 09:25
A simple matrix with interesting inverse 31 Mar 2021
Keywords: sparse linear solver, python, scipy, testcase, matrix, GMRES, poisson, plot
Wikipedia GMRES says
denis-bz
/ 0-Mittelmann-ip-simplex.md
Last active
January 26, 2021 16:50
Mittelmann interior-point and simplex benchmarks 24 Jan 2021
Mittelmann interior-point and simplex benchmarks from http://plato.asu.edu/bench.html
Keywords, tags: linear programming, benchmark, Mittelmann, HiGHS, python, scipy, sparse-matrix
This plot shows the runtimes of various LP interior-point and simplex programs on Mittelmann's benchmark problems.
To plot similar rows / similar columns near each other,
denis-bz
/ 0-LP-benchmarks-Mittelmann-HiGHS.md
Last active
January 21, 2021 14:28
A few Mittelmann LP benchmarks run with HiGHS-ipm 19 Jan 2021
Keywords, tags: linear programming, benchmark, Mittelmann, HiGHS, python, scipy, sparse-matrix
Here are logfiles for a few of the Mittelmann linear programming benchmark problems, run with the HiGHS interior-point solver via python-scipy. lpbar