Newbie 1909 | Scheme | Over

[Plotinus]

u r a person 2 replaces Dell! Please welcome them!

[EGL]

@loop you mean 168 and 169? 167 just says he was skimming before replacing in.

Also, welcome child.

Also, dicideaq said he thought

town

would be quiet and not scum. Not trying to speak for him or defend him (I'd like him to start saying words that contribute to the finding of scum) but it was in the quote you included.

[Plotinus]

Official Vote Count 1.05 Abstracter Abstraction

Well we don't want always to find products. Sometimes we want to find sums. Also we did it recursively last time so let's do it iteratively this time. Recursion has two meanings in computer science and I don't want to confuse them. The first meaning is a procedure which calls itself. In that sense, all the procedures I've shown you have been recursive. For-each does exist in Scheme but it'll be many votecounts before I introduce it because we won't use it until we really need it and we don't need it yet.

The other meaning of recursion is a process that grows horizontally instead of just linearly. If you drew out all the evaluation steps it makes a kind of triangle, which the things it's holding in memory getting bigger and bigger. Imagine that Harry wants to add 4 and 7 so he gives the 4 to George and then George remembers 1 and hands a 3 to Fred, who remembers 1 and hands a 2 to Edith, who remembers 1 and hands a 1 to Dorothy, who remembers 1 and hands a 0 to Cathy, and then they pass the ones back up the line, adding them onto the 7 one at a time until you get 11.

So here is an accumulator that grows linearly. Because the only recursion is in a tail-call (the very last thing that iter-accumulate calls is itself), the compiler recognises that this is happening and doesn't keep the last iteration in memory, so the stack doesn't grow with each iteration, it doesn't take up more and more memory.

Accumulate takes a lot of arguments. Combiner will tell it whether we're doing products, sums, or something else. null-value is to help it get started: adding 0 or multiplying by 1 or something. If it doesn't need to do any iterations at all, this is what'll return. func is the same thing it was last time, a function that we're iterating over. When we were approximating pi it was (2n/(2n -1)) * (2n/(2n +1)). this-a is the current number that it's looking at. next-a is a function that tells it how to get to the next-a. last-a is our end point. In the internal function, answer is where we keep track of what we've figured out so far.

(define 
(accumulate combiner null-value func this-a next-a last-a)
  (define 
(iter-accumulate answer this-a last-a)
    (if 
(> this-a last-a)
	
answer
	
(iter-accumulate 
(combiner 
(func this-a)
 answer)
			 
(next-a this-a)
			 last-a)
)
)
  (iter-accumulate null-value this-a last-a)
)

Well now we can do products like this:

(define 
(product func a next b)
  (accumulate * 1 func a next b)
)

And summations like this:

(define 
(sum func a next b)
  (accumulate + 0 func a next b)
)

factorial now looks like:

(define 
(factorial n)
  (product + 1 1+ n)
)

sum of squares is now just

(define 
(sum-squares a b)
  (sum square a 1+ b)
)

And it's lightning fast. This is the biggest number that doesn't make a noticable delay on my ancient computer, and by unnoticable I mean < 100 miliseconds.

scheme@(guile-user)> (sum-squares 1 500000)
$30 = 41666791666750000

Spoiler: Python version of sumsquares is about 7 times slower, using a while loop to get from a to b.

def
 
accumulate
(
combiner, nullValue, func, thisa, nexta, lasta
):
    answer = 
nullValue
    
while
 thisa <= lasta:
        answer = 
combiner
(
func
(thisa), answer)
        thisa = 
nexta
(thisa)
    
return
 answer

def
 
product
(
func, a, nexta, b
):
    
return
 
accumulate
(
lambda
 
x, y
 : x * y, 
1
, func, a, nexta, b)

def
 
sum
(
func, a, nexta, b
):
    
return
 
accumulate
(
lambda
 
x, y
 : x + y, 
0
, func, a, nexta, b)

def
 
sumOfSquares
(
a, b
):
    
return
 
sum
(
lambda
 
x
: x ** 
2
, a, 
lambda
 x: 
1
 + x, b)

%timeit 
sumOfSquares
(
1
, 
500000
)
719
 ms ± 
8.02
 ms per loop (mean ± std. dev. of 
7
 runs, 
1
 loop each)

---

Lynching

With 9 votes in play, it takes 5 to lynch.

dicideaq

(2): teacher, EGL

Loopdan

(2): Clemency, dicideaq

Child

(1): Loopdan

Clemency

(1): Child

Not Voting

(3): Emperor flippyNips, u r a person 2, Amzela

Deadline:

(expired on 2019-01-06 08:45:00).

Mod notes:

Child is the new ZombieStriker! u r a person 2 is the new Dell![/area]

[EGL]

Welcome u r a person 2.

[u r a person 2]

Hey, I'm looking forward to playing with everyone. yadda yadda, I'm on the last day of my vacation and doing an 18 hour drive tomorrow so I'm going to semi active and then I'm going to be not at all active and then I'm going to be active.

Jumping right in, can you give me the full walk through here because I'm trying to see what you're talking about and I'm not.

Child knew TTTT was my alt at least four hours before he posted 168, which means he had read post 137. But when he was typing 168 he somehow hadn't read 129 on the same page as 137.

[u r a person 2]

Welcome u r a person 2.

and a hearty welcome to you as well!

[EGL]

Loop disregard my question. You posted while I was writing mine.

[EGL]

U r a person when you can would you share your thoughts on Clemency, child, and dicideaq?

[Clemency]

Clem, sheep me and prove you aren't his partner.

sure thing bucko
VOTE: child

[EGL]

@loop How exactly does that prove Clemency isn't his partner again? Scummates will often try to distance themselves from one another in case one of them gets caught, won't they? And since you asked him to do it for that very reason... Are you thinking scum clem would follow along with your request in an attempt at passing as town?

[u r a person 2]

clemency - town lean. My thinking meshed with his when reading through his interaction with loopdan about the self vote. Nothing I would take to the bank. i did a paper on estonia once upon a time and that might be biasing me here. It seems like a nice country.

child - lemme wait on this until loopdan explains his insight a little better.

dici - I see what ya'll have been talking about and I believe that for some people their openings can be very AI. also the naked vote.. it's a scummy start, no way around it. Could be lynch bait. Dici, if you're town, then I think you're probably struggling to get into this game. I suggest that you talk about your reads, arguments people have made, votes, or really anything at all.

VOTE: Dici

[Child]

Also, dicideaq said he thought

town

would be quiet and not scum. Not trying to speak for him or defend him (I'd like him to start saying words that contribute to the finding of scum) but it was in the quote you included.

3. I guess I'd stay quiet

this is what he said when asked about his scum game.

Child knew TTTT was my alt at least four hours before he posted 168, which means he had read post 137. But when he was typing 168 he somehow hadn't read 129 on the same page as 137.

Yet 168 looks like he is developing reads as he is going through the game post by post.

I think it's more likely he is manufacturing his reads in 168 than he legitimately only read post 137 on page 6.

my bad. i tried to make a catchup post but couldnt decide whether to do a live reaction one or do a summary, so i ended up doing a mix of both that doesn't work at all.
im gonna say this - i read the topic yesterday, but only slightly skimmed it,to see what's going on, and in case i wanted to replace in and not be completely clueless. I didnt remember much other than you "bullying newbies" and TTTT being your alt, so i posted it to say hello and let others know i have been reading, atleast a bit. im obviously not gonna pay as much attention if im not in the game myself, am i?

[EGL]

clemency - town lean. My thinking meshed with his when reading through his interaction with loopdan about the self vote. Nothing I would take to the bank. i did a paper on estonia once upon a time and that might be biasing me here. It seems like a nice country.

child - lemme wait on this until loopdan explains his insight a little better.

dici - I see what ya'll have been talking about and I believe that for some people their openings can be very AI. also the naked vote.. it's a scummy start, no way around it. Could be lynch bait. Dici, if you're town, then I think you're probably struggling to get into this game. I suggest that you talk about your reads, arguments people have made, votes, or really anything at all.

VOTE: Dici

Good vote.

[EGL]

@child fair enough. I thought you were referring to his answer to question 4 in your post.

[teacher]

@Teacher - I don't think I've read any of your games. Are you a better town or scum player?

i think slightly town but I enjoy both. Newb 1882 and mini normal 2016 are good examples t and s respectively.

[Loopdan]

@loop How exactly does that prove Clemency isn't his partner again? Scummates will often try to distance themselves from one another in case one of them gets caught, won't they? And since you asked him to do it for that very reason... Are you thinking scum clem would follow along with your request in an attempt at passing as town?

I want some more votes on Child and Clem is the kind of player who isn't afraid to sheep (some people think this makes them look weak, but Clem is a memey player so I don't think he minds). The only insight it really provides is that it looks like his read changed on me, since I was his prior vote.

[Loopdan]

Hey, I'm looking forward to playing with everyone. yadda yadda, I'm on the last day of my vacation and doing an 18 hour drive tomorrow so I'm going to semi active and then I'm going to be not at all active and then I'm going to be active.

Jumping right in, can you give me the full walk through here because I'm trying to see what you're talking about and I'm not.

Child knew TTTT was my alt at least four hours before he posted 168, which means he had read post 137. But when he was typing 168 he somehow hadn't read 129 on the same page as 137.

I'll try explaining it the other way around.

Child came into the game and immediately said hi TTTT (one of my alts). Teacher is like how'd you know that so quick have you been following the game? Child is like yeah bro I skimmed it. Then 4 hours later Child posts a play-by-play of the game which shows him developing his reads, and replying to other's posts, and not realizing what I was doing with the L-1 self-vote... until he gets to a post on page 6 where I explained it, and he's like damn bro you got me! But I had mentioned I was TTTT a couple posts above that post on page 6, so if he's already read that page why is he acting like he is developing these reads in his play-by-play.

In other words it looks fake.

[Loopdan]

Although I do like his most recent reply (186).

[Loopdan]

VOTE: dicideaq

This is L-1.

Do not vote dici without first stating your intent to hammer and allowing everyone (including dici) a chance to respond.

[teacher]

Although I do like his most recent reply (186).

i was having a mind meld w you on the initial reaction, but 186 didn’t swing it back to me. 169 (sorry no links from the airport) felt to me almost like someone who saw the disconnect between the skim claim and the reactions post too late after posting, so immediately said it didn’t work.

I’m missing Amzela - I think that slot needs some real time talk. Next time you come on, can you let me know a time to plan to meet you and just live chat? Like it’s now Saturday - let me know any time Monday that works for you and I can shake free for a bit.

[teacher]

clemency -

child -

dici -

Why these three people only? Why them in particular?

[teacher]

clemency -

child -

dici -

Why these three people only? Why them in particular?

Never mind saw 182. Trouble with phones

[EGL]

U r a person when you can would you share your thoughts on Clemency, child, and dicideaq?

@teacher ^

U r was just responding to my question.

[EGL]

Lol sorry one of those situations again where I was replying when you were posting. My bad. Smartphones are wonderful things, no?

[EGL]

@loop How exactly does that prove Clemency isn't his partner again? Scummates will often try to distance themselves from one another in case one of them gets caught, won't they? And since you asked him to do it for that very reason... Are you thinking scum clem would follow along with your request in an attempt at passing as town?

I want some more votes on Child and Clem is the kind of player who isn't afraid to sheep (some people think this makes them look weak, but Clem is a memey player so I don't think he minds). The only insight it really provides is that it looks like his read changed on me, since I was his prior vote.

Thanks.