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Ask Electrical Engineering Engineering

Best practices for parallel DC/DC Boost Converters

I’m working on a portable project that takes 4 (appropriately-rated) Li-Ion cells in a 4S configuration (14.46-16.8V) and boosts it to 27V for a 10-20 Ohm resistive load (soldering iron). The majority of the purpose of the project is because I want the learning experience; I know there are commercial offerings. Running my numbers, I’ll […]

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User Help

How Do I Convert Dell Monitor into TV if it does not have TV Tuner

An uncle who returned from the hospital (underwent radiation, no cancer detected!) wants to learn computers. He is looking for large computer screen that can double as a TV. So far we found two 55" screen monitors from Dell (https://www.dell.com/en-us/work/shop/compare?ocs=210-alwv,210-arev). However they do not have TV tuner 🙁 Where do we find instructions on how […]

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Mastering Development

preprocessing methods of H2O

What preprocessing methods are used in the autoML pipeline? It would be nice to have a brief summary of all these steps in the doc. By preprocessing, I mean: one-hot-encoding, normalization, imputation, etc. Thank you, Yassine

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Mastering Development

Ruby formatter for VS Code

I am new to Ruby. I am using Visual Studio Code and was wondering if there is a formatter (like the extension Prettier) for Ruby. I would like to use it to indent properly, etc. Thank you!

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Ask Board Games Games

How to generate numbers from a Pareto distribution?

I need to generate numbers from a Pareto distribution (https://en.wikipedia.org/wiki/Pareto_distribution) for a game I’m making. Ideally with xm=10, and alpha = 2, but approximately is good enough. Is there anyway I can do this? I want to do it an "analogue" way (like with dice, cards, etc.) Thank you.

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Mastering Development System & Network

how can I run 2 php-fpm version on outdated centos 4.9

I am recently hired to create a new backend API. The work is done: use laravel – newest version + PHP 7.3. But when it comes to deploying phrase, the customer wants me to deploy it on the server they are using: centos 4.9 + PHP 5.3.28 + apache There are a few options: downgrade […]

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Mastering Development Software

How do I really write tests without mocking/stubbing?

I have been using TDD when developing some of my side projects and have been loving it. The issue, however, is that stubbing classes for unit tests are a pain and makes you afraid of refactoring. I started researching and I see that there are a group of people that advocates for TDD without mocking–the […]

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CMS Mastering Development Wordpress

WP Donation Form with custom payment API

I want to know if there’s a plug-in out there which gives you the possibility to create a donation form and to use a custom payment gateway(not only Stripe,PayPal, etc). Thank you!

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Mastering Development System & Network

Firewall on small network (Debian 9)

I have written following iptables-based firewall for a small network with one server behind it exposing things like webserver and email. It is meant to be rather restrictive at the outset and new rules to be added as needed. #!/bin/bash modprobe ip_nat_ftp modprobe ip_conntrack_ftp modprobe ipt_iprange echo -n ‘1’ > /proc/sys/net/ipv4/ip_forward echo -n ‘0’ > […]

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Mastering Development Software

Is there a term for a data model that has a type and several data fields where all fields but one (determined by type) are null?

I’m working on a project that uses an API. The have “Catalog” objects. Each Catalog object has a type and several data fields, such as “imageData”, “taxData”, or “modifierData”. All data fields are null except for one, as determined by the Catalog object’s type. I’m designing a database schema and I’d like to read about […]