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Harrierfalcon
The Raptor of Calcs
Super Elite (Last Title)
Joined: 25 Oct 2006
Posts: 2535
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 Posted: 30 Jun 2008 10:50:02 am Post subject: |
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You don't ever want to use that in a loop where speed is critical.
:0→Z
:startTmr→X
:For(Y,0,E3
:getKey
:Z+(Ans=26)-(Ans=24→Z
:End
:Disp checkTmr(X
:0→Z
:startTmr→X
:For(Y,0,E3
:getKey
:Z+∆List(Ans={24,26→Z
:End
:Disp checkTmr(X
Test 1: Results for running that without pressing any keys:
1: 19 seconds
2: 68 seconds
Test 2: Results for running it, but going to E2 instead of E3:
1: 2 seconds
2: 7 seconds
Repeating Test 2 with me mashing the left button has no apparent effect on the speed. (I would've repeated Test 1 with mashing, but I'm not about to sit there for a minute mashing buttons)
Last edited by Guest on 30 Jul 2010 05:33:55 am; edited 1 time in total |
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Weregoose
Authentic INTJ
Super Elite (Last Title)
Joined: 25 Nov 2004
Posts: 3976
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| Posted: 30 Jun 2008 01:23:09 pm Post subject: |
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For what it's worth, ⌂ is a (5-sided) symbol that represents a house, and is not included in the TI-83+ character set. A change in value—which is what [font="times new roman"]∆List() observes—is denoted by the Greek Capital Letter Delta ([font="times new roman"]∆). As always, instructions for writing all the calculator's symbols are available here.
[EDIT]
Moved posts to the appropriate topic.
Last edited by Guest on 30 Jul 2010 05:34:49 am; edited 1 time in total |
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luby
I want to go back to Philmont!!
Calc Guru
Joined: 23 Apr 2006
Posts: 1477
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| Posted: 30 Jun 2008 05:12:25 pm Post subject: |
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| So, the routine would go well in a menu type scenario, no? |
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Harrierfalcon
The Raptor of Calcs
Super Elite (Last Title)
Joined: 25 Oct 2006
Posts: 2535
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| Posted: 30 Jun 2008 06:36:36 pm Post subject: |
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Goose: I fixed it. Is that better now? >_<
luby: Technically, depends on the type of menu. Realistically, yes. |
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Cryzbl
Newbie
Joined: 20 Jun 2008
Posts: 46
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| Posted: 01 Jul 2008 03:44:19 pm Post subject: |
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luby wrote: Anybody who wants a dirty keypress optimization:
X+(K=26)-(K=24→X
17 bytes
X+⌂list(K={24,26→X
15 bytes
[url="http://tifreakware.ath.cx/index.php?showtopic=1177&st=0"]Source[/url]: darkstone knight
As for speed... I haven't checked yet. I'd guess the bigger one by a tiny bit.
[post="124924"]<{POST_SNAPBACK}>[/post]
Well I guess you could make a list of possible values for K and do this:
X+L1(K→X
Not really smaller (since you need to initialize L1 plus the size of L1) but it would be very fast.
You may want to modify K before doing that though (to shrink the size of L1)
Last edited by Guest on 30 Jul 2010 05:35:24 am; edited 1 time in total |
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TheStorm
Calc Guru
Joined: 17 Apr 2007
Posts: 1233
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| Posted: 01 Jul 2008 04:20:33 pm Post subject: |
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| That's a good idea but the size of the list makes it impractical to use. the list would need 105 elements though you could use a formula to shrink it down but then the other methods are faster. Though if you are doing a lot of test like this you could use one list for all of you tests and if someone used a formula to generate the list you might be able to make up the size difference caused by the large list. |
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Cryzbl
Newbie
Joined: 20 Jun 2008
Posts: 46
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| Posted: 01 Jul 2008 07:45:25 pm Post subject: |
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Not really :P
DelVar L1105→dim(L1
-1→L1(keyleft
1→L1(keyright
You'll need multiple lists for up/down left/right but one could make them in the same list using complex numbers.
Also, how could other methods be faster?
EDIT:
On a side note, could this forumula be used to shrink the size?
K-4int(log(K
Or something along those lines.
[offtopic]
Quote: Lisp
Learning it
-may switch to python because no one I know knows lisp.
I do. 
[/offtopic]
Last edited by Guest on 30 Jul 2010 05:35:50 am; edited 1 time in total |
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luby
I want to go back to Philmont!!
Calc Guru
Joined: 23 Apr 2006
Posts: 1477
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| Posted: 01 Jul 2008 09:16:45 pm Post subject: |
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I don't think you understand what TheStorm is saying. The ∆List() command takes up more clock cycles (CPU time) then the alternative individual checking.
So, it would take 105 keypresses to check for (there's not even that many keys) for the ∆List() to be faster then hard coding, which makes the use of the routine (to add/subtract one) moot anyway because it was designed for two keypresses.
Understand?
Last edited by Guest on 30 Jul 2010 05:32:50 am; edited 1 time in total |
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