Project Euler again, this time Python. The problem is to sort a list of 5000 names alphabetically then give them a value. For example “COLIN” is 3 + 15 + 12 + 9 + 14 = 53 and is the 938th item – so its value is 49714 (53*938).
Project Euler problem 21 is to find the sum of all amicable numbers under 10000. An amicable number is:
Let be the sum of proper divisors of then and if then and are amicable numbers.
OK so today I’m trying problem 12 – find the first triangular number with over 500 divisors. This is the first Project Euler problem I’ve really struggled to find a solution in a reasonable amount of time. Continue reading “First triangular number with 500 divisors”
I’m beginning to like R. You can capture table data from a connection (a generalised file), one of which is the clipboard, to a data frame.
problem.matrix <- as.matrix(read.table("clipboard",sep=" "))
I got Visual Studio 2017 through Microsoft’s Dreamspark promotion and thought I’d give it a try. I haven’t done a lot of development under Windows because its only on my laptop and my Linux desktop has 12 Gb RAM.
Continue reading “Project Euler, Visual Studio and playing with Python”
This is a quick post to remind myself of the stuff I do when re-installing Arch. Continue reading “Simple Arch Linux Installation”
My wife’s laptop is an Asus X541SA – a fairly generic and inexpensive workhorse. With a Quad-Core N3710, 4Gb of RAM and a 1TB HDD. Unfortunately its ridiculously slow. Opening, switching and closing applications leaves time to make a cup of tea and clicking save in Word is likely to see a “(not responding)” caption in the title bar.
A quick look in task manager shows the HDD is perpetually at 100%. Having already tried a clean install of Windows 10, I figured an SSD might help. I got this 120 Gb SanDisk SSD, having used them before with good results.
What a difference it makes, the laptop is not only usable but responsive. While I doubt it would handle many games it can at least cope with Office and Firefox, which it couldn’t before.
This tablet was super fast when I got it but now it lags and drives me nuts. I’d seen someone post on Reddit that flashing the factory image helped so I gave it a go.
Factory images are available here along with good, clear instructions. One caveat, Arch needs super user for fastboot otherwise you get “< Waiting for device >”. For the same reason run flash-all.sh with sudo too.
As to whether or not it helped, it is hard to say but I feel it has. How do you measure something that is entirely subjective?
Edit. Its been a few days now and it is faster. Much faster and without lag. I’m unclear why though. I’m not completely familiar with Android’s architecture but wonder if it’s a combination of multiple updates being applied (this was I think Android 5.0 when bought) and accumulated futz.
I bought an Anker PowerPort Qi 10 inductive charger from Amazon (£13.99). I’ve seen a few people online complaining that it isn’t “wireless charging” because it’s still “plugged in” – a farcical complaint akin to suggesting that the device draw current from the ether.
Without doubt one of the most convenient devices I’ve used – put your phone on it and off it goes. The only things that are worth bearing in mind are that you need to use a fast charger if you want it to fast charge.