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Ti-Basic Optimization
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zeldaking


Power User


Joined: 31 Jul 2011
Posts: 470
Location: Utah
Posted: 09 May 2012 10:41:09 pm    Post subject: Ti-Basic Optimization
Recently I have been teaching a kid at school Ti-Basic. I am now teaching him about optimizing. I made a simple 'game' in 96 bytes but wondering if I could make it smaller. The 'game' moves a '*' around without letting it leave the homescreen boundaries. Yeah I know very simple. Here is what I have:

Code:

:1->A:1->B
:Repeat K=45
:getkey->K
:ClrHome
:Output(B,A,"*
:A+(K=26 and A!=16)-(K=24 and A!=1)->A
:B+(K=34 and B!=8)-(K=25 and B!=1)->B
:End
//!= not equals to

Thanks
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blue_bear_94


Member


Joined: 20 Apr 2012
Posts: 162
Posted: 09 May 2012 10:51:02 pm    Post subject:

Code:

:1->A:1->B
:Repeat K=45
:getkey->K
:ClrHome
:Output(B,A,"*
:A+(Ans=26 and A!=16)-(Ans=24 and A!=1->A
:B+(K=34 and B!=8)-(K=25 and B!=1->B
:End
//!= not equals to

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TheStorm


NOU!


Joined: 26 Mar 2007
Posts: 2375
Posted: 09 May 2012 10:51:38 pm    Post subject: Re: Ti-Basic Optimization

Code:

:1->A:1->B
:Repeat K=45
:ClrHome
:Output(B,A,"*
:getkey->K
:A+(Ans=26 and A!=16)-(Ans=24 and A!=1->A
:B+(K=34 and B!=8)-(K=25 and B!=1->B
:End


Saved two bytes and made a slight speed optimization. I know there is more to be saved but that is what I saw with a quick glance.

Edit: Blue_bear beat me too it, then again I took the time to say what I did.
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zeldaking


Power User


Joined: 31 Jul 2011
Posts: 470
Location: Utah
Posted: 09 May 2012 10:54:02 pm    Post subject:
Oops sorry, I accidentally wrote those closing parentheses... just going off of memory. looking at my code I didn't have those :p
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Compynerd255


Power User


Joined: 08 Apr 2011
Posts: 397
Posted: 10 May 2012 09:15:29 am    Post subject:
In floating point operations, does "While K-45" save speed over "Repeat K=45"? I know that it saves time and speed in Axe.
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Aes_Sedia5


Minor Calculator Deity


Joined: 01 Sep 2011
Posts: 1002
Location: Where Nightmares end and Dreams begin
Posted: 10 May 2012 12:08:00 pm    Post subject:
I know repeat K=45 is pretty standard.. I have seen Repeat in every program that uses sprite movement. as I understood it, they are the same speed.
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turiqwalrus


New Member


Joined: 18 Nov 2010
Posts: 95
Location: Eggplant shopping! :P
Posted: 10 May 2012 01:52:00 pm    Post subject:
Aes_Sedia5 wrote:
I know repeat K=45 is pretty standard.. I have seen Repeat in every program that uses sprite movement. as I understood it, they are the same speed.


In which case Repeat K=45 should be used, as it is more understandable...
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blue_bear_94


Member


Joined: 20 Apr 2012
Posts: 162
Posted: 10 May 2012 02:47:16 pm    Post subject:
What if K is already 45?
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merthsoft


File Archiver


Joined: 09 May 2010
Posts: 2735
Posted: 10 May 2012 02:51:07 pm    Post subject:
Repeat evaluates the conditional at the end of the loop, rather than the beginning. See http://tibasicdev.wikidot.com/repeat. While does it before, so doing "While K-45" could cause the loop to not run. See http://tibasicdev.wikidot.com/while
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builderboy2005


Member


Joined: 05 Aug 2008
Posts: 122
Posted: 10 May 2012 02:51:15 pm    Post subject:
Repeat loops check their condition at the bottom of the loop instead of at the top like While. Consequently a Repeat loop will always execute at least once, which makes it useful for situations like this where we don't care what K was before the loop.

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zeldaking


Power User


Joined: 31 Jul 2011
Posts: 470
Location: Utah
Posted: 10 May 2012 05:44:20 pm    Post subject:
Yeah the getkey resets K to zero the first time through. I tried while loop, and a for( loop the latter taking the most bytes.

Code:

:for(K,0,45
:getkey->K
:end
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KermMartian


Site Admin


Joined: 14 Mar 2005
Posts: 55742
Location: Earth, Sol, Milky Way
Posted: 11 May 2012 11:51:10 am    Post subject:
Indeed, that's a quite clever way to do it, but sadly not sufficiently optimal for all its slyness. I know I'm beating my own drum too much about this, but I feel I wrote up a fairly thorough guide to optimization as Chapter 10 of my book, and I detailed things like the differences between While and Repeat and the proper places to use each. At any rate, I'd say that the code as presented is a quite nice little program, and about as optimized as you'd want to or be able to get for something like this.
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Xeda112358


Power User


Joined: 09 Nov 2010
Posts: 352
Posted: 08 Jun 2012 06:59:10 am    Post subject:
This is a little more optimised:

Code:

:1→A:1→B
:Repeat K=45
:getKey→K
:If Ans                      ;Added this in so as not to be blinking so much.
:ClrHome
:Output(B,A,"*
:max(1,min(16,A+(K=26)-(K=24→A
:max(1,min(8,B+(K=34)-(K=25→B
:End
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KermMartian


Site Admin


Joined: 14 Mar 2005
Posts: 55742
Location: Earth, Sol, Milky Way
Posted: 08 Jun 2012 08:03:00 am    Post subject:
Mmm, that is indeed better. I had held off on the min-max form for the sake of possible confusion, but you're absolutely right that it's smaller. Out of curiosity, have you checked what the relative speed of that is? In this case I'd expect it to be a negligible difference, I suppose.
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Xeda112358


Power User


Joined: 09 Nov 2010
Posts: 352
Posted: 08 Jun 2012 08:06:51 am    Post subject:
I don't have the timings, but I do imagine it is negligible. min() and max() are fairly fast to compute.
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zeldaking


Power User


Joined: 31 Jul 2011
Posts: 470
Location: Utah
Posted: 08 Jun 2012 09:12:35 am    Post subject:
hmmm, I have never used max( or min( before. What is the syntax?
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KermMartian


Site Admin


Joined: 14 Mar 2005
Posts: 55742
Location: Earth, Sol, Milky Way
Posted: 08 Jun 2012 11:37:57 am    Post subject:
zeldaking wrote:
hmmm, I have never used max( or min( before. What is the syntax?
min(X,Y) will find and return the smaller of X and Y; max(X,Y) will find and return the larger of X and Y. If you work with lists instead, min({a,b,c,...z}) or min(L1) will return the smallest value of the list, and symmetrically, max(list) will return the largest value in the list.
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