Python code using xarray.open_dataset() or xarray.open_dataarray() or similar functions reading from NetCDF4 use an
LRU cache
that automatically closes unneeded files.
As of xarray 0.11.0, the obsolete autoclose=True option should no longer be used.
Problems fixed by LRU cache: the LRU cache used to open NetCDF4 files with xarray fixes these problems, and gives high performance:
random segmentation fault while reading NetCDF4 .nc files, where the same file is reopened in the program.
OSError from too many open files, where even increasing ulimit doesn’t help
On upgrading major versions, say from VirtualBox 5.2 to VirtualBox 6.0, you may find you can’t start any of your VM images, getting an error including “kernel modules do not match”.
This may mean you haven’t removed all of the old version VirtualBox components.
Consider using synaptic or
apt list --installed | grep virtualbox
to see if any old VirtualBox components are installed that may be conflicting with the new VirtualBox version.
Network and USB printing with Brother printers generally work great on Linux and Windows Subsystem for Linux.
The Brother installer script automatically downloads and installs necessary programs.
Opt out of the last program brscan-skey, as it’s unnecessary.
“Will you specify the Device URI? [Y/n]” y (if networked)
“Specify IP address”: “Enter IP address” the static IP printer address
BRscan: YES allows xsane for Brother scanning printers.
BRsaneconfig: YES xsane scanner over the network
BRscan-Skey: NO don’t install because of potential security risks.
If accidentally installed brscan-skey, uninstall with
dpkg -r brscan-skey
As usual, manage/check printer from CUPS by pointing your PC web browser to localhost:631
Scanning documents in Linux in typically done with Xsane, which works on networked or USB connected scanners.
apt install xsane
xsane
To update scanner IP address use brsaneconfig4
For native Windows (not using Windows Subsystem for Linux), download just the driver that is about 15-20 MB and add the printer by IP address and choose “have disk”, pointing to the folder where you extract the drivers files to.
GitHub Linguist
is reasonably accurate at automatically detecting the percentages of each code language in Git tracked code.
However, as with any automatic coding language detection scheme, mis-detected languages occur.
This seems to happen most often with Matlab code.
Despite being in the top 10 STEM / data science languages, Matlab / GNU Octave *.m files can be detected as other languages such as Objective-C or Limbo.
Matlab can adjust for
HiDPI (2K, 4K, etc.) displays.
HiDPI Matlab IDE resolution (icon and font size) can be manually corrected from within Matlab on any operating system.
Matlab has programmatic DPI access to get / set information on DPI as well as numerous other Matlab characteristics via
settings.
This is a basic example of using FORD to document Fortran projects.
FORD is a Python program:
pip install ford
Each project will have a ford.md that configures and makes description for the main project landing page.
If your code is all under the top-level directory, set ford.md like: (this example is for the fortran2018-examples repo)
src_dir: ./
output_dir: ./docs
project: Fortran 2018 examples
project_github: https://github.com/scivision/fortran2018-examples
project_website: https://scivision.github.io/fortran2018-examples
summary: Fortran 2018 examples
author: Jane Doe
author_description: SciVision, Inc.
github: https://github.com/scivision
license: by
exclude: CMakeFortranCompilerId.F
display: public
protected
private
source: false
graph: true
search: true
Put Markdown test of arbitrary length here.
Within the Fortran code, use `!!` on each line with Markdown, Latex, etc.