Tony

Oct 122017
 

Boolean functions, sometimes also called switching functions, are functions that take as their input zero or more boolean values (1 or 0, true or false, etc.) and output a single boolean value. The number of inputs to the function is is called the arity of the function and is denoted as k. Every k-ary function can be written as a propositional formula, a sentence in propositional logic. A binary Boolean function, a Boolean function with two arguments, can be described by one out of sixteen canonical formulas.

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Sep 272017
 

Robot holding human skullFrom Vienna Bienalle 2017, taking place this week in Austria, comes a new take on Isaac Asimov’s Three Laws of Robotics.  The head of the project, Christoph Thun-Hohenstein, says the update was necessitated by:

…the need for benign intelligent robots and the necessity of cultivating a culture of quality committed to serving the common good!

That sounds a lot like Asimov’s reasoning, but the new laws are certainly worthy of consideration and debate.

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Sep 212017
 

RGB color modelIf you are an artist, photographer, graphic designer, or web developer, having a firm understanding of colors is a necessity.  Key to being able to study and discuss colors is a formal framework for quantizing their properties. Abstract mathematical models called color models do just this, allowing people to discuss the qualities of a color in a consistent manner. These models usually assign tuples of numbers to a color, often either ordered triplets or quartets, where each value represents a property of the color. This post will introduce one the most popular models: the RGB color model.

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Jul 162017
 

An arithmetic sequence of numbers, sometimes alternatively called an arithmetic progression, is a sequence of numbers in which the difference between all pairs of consecutive numbers is constant. A very simple arithmetic sequence consists of the natural numbers: 1, 2, 3, 4, … where the difference between any number and the number before it is just one. 3, 7, 11, 15, 19, …. is another arithmetic sequence, but in this case the constant difference between elements is four.

A finite portion of an arithmetic sequence like 2, 3, 4 or 7, 11, 15 is called a finite arithmetic progression. To confuse matters, sometimes a finite arithmetic progression, like an arithmetic sequence, is also called an arithmetic progression. To be safe, when a progression is finite, I always say as much.

An arithmetic series is the sum of a finite arithmetic progression.  An arithmetic series consisting of the first four natural numbers is 1 + 2 + 3 + 4. The sum, 10, is trivial to compute via simple addition, but for a longer series with larger numbers, having a formula to calculate the sum is indispensable.

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Jun 262017
 

warning symbol

In general it’s a good idea to see warnings your code generates while you are testing, but if you are anything like me, you usually don’t need to see warnings generated by third party code. I was plagued by this today as I was testing a function that utilized NLTK, one of, if not the most, popular natural language processing software libraries for Python.

I’m not too proud to admit that only very rarely do my unit tests run without any failures. It’s usually difficult enough to track down the failures and errors without also being swamped by a ton of extraneous warnings generated by third party software.  Such was the case with a simple function I had written to remove accidental duplicate characters from a piece of text.

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Jun 092017
 

Boston Dynamics

Boston Dynamics, the MIT spin-off and self-proclaimed maker of “nightmare-inducing robots“, has been sold by its parent company Alphabet (aka Google) to the Japanese tech behemoth SoftBank. No specifics regarding the price or the terms of the sale have been announced which is not surprising given we still don’t know how much Google paid for the company when it purchased it four years ago.

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May 222017
 

teamwin logo

If you want to do anything at all interesting with your phone once you have unlocked the bootloader, you will need to install custom recovery software on it. And if you are going to install a custom recovery image on your phone, you are going to want to install Team Win Recovery Project, more commonly known by its abbreviation TWRP, the most popular, open source custom recovery software for Android phones.

If you are reading this post, then you likely already know the advantages of installing a custom recovery like TWRP. For those that don’t, TWRP offers a plethora of functionality that stock recoveries do not. With TWRP, you can install custom ROMs and kernels on your phone. You can backup and restore your entire phone including partitions that normal backup apps can’t touch including boot and system. You can wipe, repair and reformat partitions. And most importantly for most Android hackers, with TWRP you can root your phone by installing a super user (root) app like the very popular SuperSu by chainfire.

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May 192017
 

 

Moto G5 Plus unlocked

These are the steps I took in order to unlock the bootloader of my Moto G5 Plus. Ultimately I would like to install custom recovery software on it à la TWRP and root it with chainfire’s SuperSu. I’ve also included some extra notes in places that that gave me problems or I thought were tricky.  The normal caveat applies: these steps worked for me, but your mileage may vary.

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May 142017
 

Android Robot

The Android Debug Bridge, aka adb, has been an indispensable tool while unlocking and rooting my new Moto G5 Plus. I’ve used it dozens of times this week to push and pull files, run shells, and reboot my phone. Today, as is my habit, I ran the command adb devices after plugging my phone into my laptop, but the response I received made it obvious that I had some troubleshooting ahead of me.

tpodlaski@Alabama:~$ adb devices
List of devices attached
* daemon not running. starting it now at tcp:5037 *
* daemon started successfully *
ZY2243PNMF      unauthorized

The output of adb devices lists the devices currently connected to your computer and recognized by the adb server. In addition to a unique identifier, the state of the device is also reported. Since I’d been using adb without issue for days, I fully expected to see the G5’s state listed as device, meaning it is connected and ready to go. Instead it was unauthorized, a condition I would have to rectify before I could get any work done.

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