Which pattern is more efficient? Pattern a: circleSumA :: [Int] -> Int circleSumA (i1 : is) = aux i1 is where aux i [] = i + i1 aux i is = i + aux (head is) (tail is) Pattern b: circleSumB :: [Int] -> Int circleSumB is = sum (is ++ [head is]) Is… Continue reading Another Haskell question
Haskell problem followup
Having read a bit of the next chapter and discovered the zipWith function, I now have a higher-order non-recursive solution to the makeChange problem, viz. makeChange1 :: Int -> [Int] -> [Int] makeChange1 amt vs = zipWith div modvs vs where modvs = scanl mod amt vs
Haskell problem
Define a function makeChange that, given a nonnegative integer amount and a list of coin denominations, returns a list of the number of coins of each denomination required to make up the amount. For example: makeChange 99 [5,1] => [19,4] i.e. 19 nickels and 4 pennies equals 99 cents. To make life easier, you may… Continue reading Haskell problem
Building a MAME cabinet 7
Just come back from a trip to Home Depot. I used the truck hire, which was easy. Now I also have 3 sheets of 4’x8′ 3/4″ oak ply in my basement, and I picked up a few 2″x3″x8′ studs too for cutting supports.
More wikihowery
Especially for . How to Find Headers and Libraries for C/C++ Pograms Using pkg-config.
I made a wikihow entry
How to Play Tiddlywinks.
Building a MAME cabinet 6
Today I was given some dedicated time by Mrs Elbeno to start the project. It being 2pm on a Saturday, I didn’t fancy my chances at getting a Home Depot truck hire (my local HD has 2 trucks and it’s first come, first served). Anyway, I headed down there and picked up: 2x 8′ 2x4s… Continue reading Building a MAME cabinet 6
Building a MAME cabinet 5
Another stop at Home Depot this morning. DeWalt countersink bits Mallet (for knocking in the t-molding) Gloves Masking tape (for anti-splinter on the top side of ply cuts, and for painting) 4 x 2-1/2″ hinges (two for the top, two for the front) I’m now at the point where I can pick up some wood… Continue reading Building a MAME cabinet 5
Building a MAME cabinet 4
I ordered the Retro Mame Marquee (third one down). With the Lexan sandwich. Since the Home Depot Lexan is 3/32″ rather than 1/8″, I decided I can’t use it. I need to make the control panel from 1/8″ Lexan and 5/8″ MDF/Ply, so that the 3/4″ t-molding will fit properly. So what I’m going to… Continue reading Building a MAME cabinet 4
Building a MAME cabinet 3
I’ve been stopping off at Home Depot on my way to work and slowly getting together more parts. I now have: Jigsaw and router bit set (borrowed from a colleague) 4 x 2″ industrial casters 1/2″ wood chisel 18″ drawer runner set Coin door! (free from a colleague) 140-tooth 7-1/4″ ply/laminate saw blade 1lb 1″… Continue reading Building a MAME cabinet 3