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benryves
Active Member
Joined: 23 Feb 2006
Posts: 564
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 Posted: 12 Nov 2008 06:01:38 am Post subject: |
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I typed the TI-OS program into my calculator exactly as it appears in the book (well, I removed the StorePic 6 and replaced it with Disp so I could see when it had finished by bouncing me back to the home screen). The BBC BASIC version is as direct a translation as I can get. IF statements in BBC BASIC must fit on a single line (rather than having a terminator), though you can do multi-line IF statements using line numbers like this:
Code:
10 IF N<=1/3 THEN 20 ELSE 40
20 X=.5*X
30 Y=.5*Y
40 :
If you could produce an optimised version of the original program I'd be glad to try again, but if we're trying to get it as fast as possible I could be very unfair and do this:
Code:
10 DIM SIERPINS 256
20 P%=SIERPINS
30 [
40 OPT 0
50; Hand-optimised assembly version in here.
60 RET
70 ]
80 CALL SIERPINS
Though I think that would be considered cheating. :P
BBC BASIC uses a faster floating-point number format (a 4-byte base-2 mantissa with a one-byte exponent rather than TI's packed BCD affair) with special optimisations when it notices that you're storing integers in reals. This probably helps it a lot in this example. |
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darkstone knight
Advanced Member
Joined: 07 Sep 2008
Posts: 438
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| Posted: 12 Nov 2008 06:19:30 am Post subject: |
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Code:
:FnOff :ClrDraw
:PlotsOff
:AxesOff
:0→Xmin:1→Xmax
:0→Ymin:1→Ymax
:rand→X:rand→Y
:For(K,1,3000)
:rand
:If ans≤1/3
:Then
:.5X→X
:.5Y→Y
:else
:If 6^-1>abs(ans-.5
:Then
:.5(.5+X)→X
:.5(1+Y)→Y
:else
:.5(1+X)→X
:.5Y→Y
:End
:End
:Pt-On(X,Y)
:End
optimized a bit, is probaly faster
i smell a brain teaser >_> |
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benryves
Active Member
Joined: 23 Feb 2006
Posts: 564
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| Posted: 12 Nov 2008 11:24:15 am Post subject: |
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Did you time it on a regular 83+?
An optimised BBC BASIC version (removing the redundant conditionals, using ELSE) looks like this:
Code:
10 REM Sierpinski Triangle.
20 CLG
30 X=RND(1):Y=RND(1)
40 FOR K=1 TO 3000
50 N=RND(1)
60 IF N<=1/3 THEN X=X/2:Y=Y/2 ELSEIF N<=2/3 THEN X=(.5+X)/2:Y=(1+Y)/2 ELSE X=(1+X)/2:Y=Y/2
70 PLOT 69,X*96,64-Y*64
80 NEXT K
It takes 1 minute and 56 seconds to run (6MHz TI-83+) rather than 2 minutes and 21 seconds. |
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benryves
Active Member
Joined: 23 Feb 2006
Posts: 564
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| Posted: 13 Jan 2009 11:40:55 am Post subject: |
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| The first beta has been released for testing. You can download it here - I look forwards to reading your comments. |
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arjan
Newbie
Joined: 14 Jan 2009
Posts: 3
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| Posted: 14 Jan 2009 05:03:24 pm Post subject: |
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Quote: The board requires you to be registered and logged in to view this forum.
Why is that? It's the only part on MaxCoderz I can't visit :S |
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benryves
Active Member
Joined: 23 Feb 2006
Posts: 564
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| Posted: 14 Jan 2009 05:24:20 pm Post subject: |
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| I assumed (incorrectly) that newly created forums would give guests read-only access. Many apologies, you should be able to view the forum without registering an account. |
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Builderboy2005
Advanced Newbie
Joined: 19 Apr 2009
Posts: 51
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| Posted: 09 Jun 2009 09:37:47 pm Post subject: |
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For some reason, when I use inkey(0) it won't respond to the arrow keys, 2nd, alpha, mode, del, vars, or the top 5 f1-f5 keys. Is this a feature or bug? Am i doing somthing wrong? My code specificaly
:10 Repeat
:20 Print inkey(0)
:30 Until False
Not that complicated... |
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