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Mastering Development

Maxwellian Distribution in Python Scipy

In the article that I am interested in, it states that the data is well represented with a Maxwellian distribution and it also provides a Mean speed (307 km/s) and 1 sigma uncertainty (47 km/s) for the distribution. Using the provided values, I have attempted to re-generate the data and then fit it with the […]

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User Help

Bash: How to eliminate a comma at the end of a variable generated by a loop

I have the following bash script which outputs two random numbers on the same line. #!/bin/bash for i in 1 2; do unset var until [ "$var" -lt 10000 ] 2>/dev/null; do var="$RANDOM" done printf "%s," "${var/%,/}" done The output is: 5751,2129, I am trying to get rid of the comma at the end of […]

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Linux Mastering Development Ubuntu

Unable to locate package after manual uninstall

I installed waterfox from a third party repository using apt. I completely forgot that I installed it using apt and uninstalled it manually. When running apt remove waterfox, I receive a message "E: Unable to locate package waterfox". I scanned through /var/lib/dpkg/status and uninstalled all waterfox related items. I’ve also searched the filenames of /etc, […]

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Mastering Development

Python, sympy: A simple set of equations involving repeated powers gives nonsensical (to me!) answers

I am new to both python and the sympy module so some of my code may be a bit ‘primitive’. This is also my first use of Stackoverflow so forgive any use errors. I have included an entire test function which can be called using TEST() [this is a simplified version of my actual work, […]

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Linux Mastering Development

Setting physical and logical partition types when setting up mount points?

I’m new to Linux and I need help with understanding partition types when setting up mount points. So I’m doing a project where I have to set up mount points for: /boot /var /home swap /tmp / So far, setting up the type of file system, size and options are quite straight forward. However, the […]

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Mastering Development

Combining specific column of elements in an environment with a for loop

I have downloaded stock data for the health care stocks of the S&P500 into a separate environment, now I would like to grab the Adjusted close column from each element of the environment and combine them into one data frame. I have written the following but I get an error: require(quantmod) require(PerformanceAnalytics) require(PortfolioAnalytics) #environment where […]

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Linux Mastering Development

USB HID report error (intentional?) prevents joydev from correctly calculating axes values

Thrustmaster T.Flight 4 would only partially work with jstest (Z axis, throttle and an additional axis on the throttle handle) so I decided to try and fix it. I dumped hidraw data and learned that those axes do indeed work, but when I compared their position in the data packet with the decoded HID report […]

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Linux Mastering Development

Splitting OS on V-NAND and storage on RAID card with Debian 10

after many years I’m rebuilding my home server. The server is used primarily as a file storage unit, which also has Emby and Logitech Media Server to stream audio/video across the house. Video files can be large. My intention is to keep the OS on separate media from the RAID array (LSI MegaRAID 9266-8i with […]

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Linux Mastering Development

How to remove GRUB which is installed in another partition (except MBR) during Dual Boot setup

I installed Kali Linux with Win10 (primary os) in a dual boot setup (I used bootable DVD for OS installing). During boot I wanted Win10 Boot menu rather than GRUB. I followed a tutorial to do this available in Youtube using EasyBCD. I followed this tutorial Yesterday: My HDD had 4 partitions which were correspondingly: […]

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Mastering Development

Instability of nonlinear mixed effects (using nlme package) in R

I am attempting to build a nonlinear mixed effects model for COVID-19 data that fits a bell curve to daily case numbers from different countries (random effects being at the country level). The data table is too large to include in the post but is available here. Here is the structure of the dataframe: > […]