YTechnology

Limit Up Limit Down Calculator in Beta Luldcalc is an iOS app I wrote to calculate price bands in accordance to the rules put forth by the LULD Committee: http://www.luldplan.com/index.html

In addition to being a basic calculator, there are buttons to select tier 1 or tier 2 stocks, and also buttons to double the bands for market open and close.
For Testers A public beta is now available at:

https://testflight.apple.com/join/gWOth57S

The link will introduce you to Apple's TestFlight app which is used to gain access to the beta version of LuldCalc.  You'll need an iPhone running iOS 8 or later.

Install the TestFlight app and you'll find an icon that looks like this:



Open the TestFlight app, and you will be presented with a screen to redeem LuldCalc:



Have fun and let me know your thoughts. Privacy Policy It is more than rude to sell information about you without your permission.  We don't do that and we'll find another way to make a living.

When Google Fi first rolled out, what was notable was its pricing scheme.  Paying only for bandwidth you use, the plan was well suited for light to moderate data consumers.  Unfortunately, Google Fi was exclusive to select Android phones, and as an iPhone user, I could only look on with envy... until recently.  Sometime around November or December 2018, Google Fi became available for iPhones, and I was ready to switch from my current carrier, VirginMobile.

When I signed on with VirginMobile, it started out as a great deal: "unlimited data" for $1 per month for the first 6 months, and then $50 per month thereafter.  The average monthly price over the course of a year came out to $25.50, but the longer I used VirginMobile, the higher the average price would be, and what began as a great deal would eventually become a bad deal, especially for someone who doesn't use much data.

Moving to Google Fi was mostly a matter of ordering the sim card, having an unlocked phone, and c…

It's not unusual for computer people to also be car guys and gals.  Cars are another form of hardware to explore, test, optimize, and modify.  My TSX Wagon review below first appeared on Edmunds' enthusiast car website under "InsideLine: Readers' Rides."  Edmunds have long since changed their format and the article is no longer there.  I am republishing it here with a few updates.






First Impressions
My wife tells me the first thing women notice about men are their shoes. Shoe size not withstanding, she explains that the kind of shoes, and the condition they're in, say a lot about who a man is, and hint at what he hopes to be.

The shoes on our base trim 2012 Acura TSX Sport Wagon are 17 inch Michelin Pilot HX MXM4. In the Michelin lineup, these tires slot between the MXV4, which lean toward comfort, and the Pilot Sport A/S, which are geared for performance. Does this wagon live up to its luxury sport aspirations?

On the outside, the wagon's overall look is s…

Quincy Larson, a teacher at freeCodeCamp, wrote an excellent post on Medium, Why is hiring broken? It starts at the whiteboard. 

Inspired, I wrote my own essay about the whiteboard problem and shared it on Medium back in May 2016.  I've reproduced it here partly for posterity, and partly because hiring software developers is still a broken process and worthy of discussion.  See my December 2018 post The Best Selling Tech Book on Amazon Is ... for more thoughts about this.



A long time ago, when I applied for my second software development job after college, I was thrust in front of whiteboard and asked to code a rudimentary strcpy() function. I felt uncomfortable, with one hand grasping a marker, and the other hand — fingers really — improvising as an eraser.

I wasn’t doing very well, as one interviewer looked unimpressed. The other, however, apparently saw something more in me, and put me in front of his PC and fired up the editor. I took to it like a fish took to water. And I got th…

Anyone involved in computer programming should be familiar with the works of Donald Knuth (the K is hard and the name is pronounced Ka-Nooth).  If not, the New York Times can remedy that, having recently published a profile on Knuth titled The Yoda of Silicon Valley.
Wise he is.  Show he does, the dark and light arts of algorithms:
Volume 1: Fundamental Algorithms Volume 2: Semi-numerical Algorithms Volume 3: Sorting and Searching Volume 4A: Combinatorial Algorithms
A very important concept, however, can be found in the title.  While students study computer science, Knuth reminds us it's still an art.  In that sense, I would compare his books to the collected works of Shakespeare -- creative, insightful, but difficult to read and better understood in a study group or book club.  Whether Knuth or Shakespeare, their works are rarely read in their entirety, but their impact can still be felt throughout society.
Programming is a science, but it is apart from the natural sciences like…

The trackpad felt firm and did not click readily.  Channeling Sherlock Holmes, I deduced the culprit was a slightly swollen battery pressing up from underneath.  Well, that and an alert ⚠️ on the menu bar clued me in that it was time replace the battery.

A trip to the local Apple Store confirmed my findings.  But Apple couldn't replace the battery because they didn't work on machines older than five years (something about keeping parts in stock).  My MacBook Pro was a late 2012 model, or six years old.  The Apple Tech referred me to a third party authorized repair center, but in that moment, I decided to try the DIY route with iFixit.

On their website, I looked up my model and purchased the appropriate battery, along with the Apple specific tools I needed to complete the swap.  I also found well written tutorials, a difficulty rating, and feedback from other do-it-yourselfers.  This battery replacement was easy and at $102.89, cost effective.

My MacBook Pro now has power to w…