Fastest loop

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Summary:

what is the fastest way to loop

Fastest loop

Silver Phantom 08 Nov 2012 03:06

I am trying to make a incrementing loop like a for( loop, but its to slow for my purposes. this what i have

for(D,6,1
for(C,3,1
(code)
end
end

i have tried using a while loop and repeat loop, but they seem slower to me.
i believe the slowness is due to the for loop, not the code, is there any faster way that is similar to this?
thx

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Re: Fastest loop

Mr Dino 08 Nov 2012 03:08

If there's an If statement in your code, that slows it down. You must close the For() loop parenthesis to speed it up.

Re: Fastest loop

Silver Phantom 08 Nov 2012 03:15

its faster now, but im starting to think i should rework the coding

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Re: Fastest loop

Silver Phantom 08 Nov 2012 15:56

Are labels faster than for loops?

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Re: Fastest loop

Roguebantha 08 Nov 2012 16:15

No, they are not. Gotos generally have to search for the label that it references. While's, For's, and Repeat's don't need to search. They know exactly where they're going!

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Re: Fastest loop

Roguebantha 08 Nov 2012 16:15

Plus, repeating labels cause RAM leaks. :)

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Boba Foxx (guest) 08 Nov 2012 16:45

Not necessarily, it's just that jumping out of a loop to a label will cause something like 8 bytes of ram to be lost. Ask Weregoose.

Roguebantha 08 Nov 2012 21:25

Ah, well I've noticed that if you ran this program:

Lbl 1
Disp "Hello World","
Goto 1

It will slow down over time and eventually generate an Error:Memory message. In comparison:

While 1
Disp "Hello World","
End

Will run fine forever, or until your calculator runs out of batteries. Or at least so is my personal experience. :)

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Weregoose 08 Nov 2012 22:26

I've failed to reproduce your results. The upper program has been running on my calculator for over 30 minutes, and there hasn't been a perceivable drop-off in speed, much less a memory error.

Silver Phantom 08 Nov 2012 22:40

… Dont use an actually calc, use an emulator! your killing your battery!

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Boba Foxx (guest) 08 Nov 2012 22:50

Once again, the flash chips don't wear easily, and those batteries last a while, even at full use.

Wolfgang47 09 Nov 2012 00:33

my batteries don't actually last very long, but that's probably because i program a lot and because i am writing programs that are likely pretty rough on the calculator.

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—Wolfgang

Re: Fastest Loop

simonalford42 08 Nov 2012 22:49

The memory error comes when it jumps out of a loop-if-then-indented thingie:

5.28→A
Label C
:If A=5.28:Then
:Goto C
:End

Using the above code I got a memory error in about 5 seconds

:1→Q
:If Q=5:Then
900 bytes of useless code
:End
:Lbl A
:If Q=Q:Then
:Output(1,1,Q
:1+Q→Q
:Goto A
:End

I made an exactly the same except repeat-using program by replacing the bolded with :Repeat 0 instead of label & goto.

Using the Repeat-using program I got up to 100 in 4.64 seconds

Using the Label-using program I got to 100 in 8.26 seconds and a memory error around 200

Boba Foxx (guest) 08 Nov 2012 22:53

Why do you have "900 bytes of useless code"?

Re: Fastest loop

simonalford42 09 Nov 2012 21:14

I have the 900 bytes of useless code because with Gotos and Labels it has to search through the code to find the Label, and so 'twould take longer with the 900 bytes. My new experiment today:
Running the Goto-using program with 900 bytes of code versus without it:

:1→Q
:If Q=5:Then
900 bytes of useless code
:End
:Lbl A
:If Q=Q:Then
:Output(1,1,Q
:1+Q→Q
:Goto A
:End

with the 900 bytes: 12.68 seconds for the calculator to count to 150 (memory error around 180)
without the 900 bytes: 8.06 seconds for the calculator to count to 150 (memory error still around 180)

And for the last experiment, Repeat loop vs. Goto loop without the extra 900 bytes:
:1→Q
:Repeat 0
:If Q=Q:Then
:Output(1,1,Q
:1+Q→Q
:End
:End

Using Goto loop: counts to 150 in 8.06 seconds (memory error still around 180)
Using Repeat loop: counts to 150 in 7.01 seconds (no memory error)

Roguebantha 09 Nov 2012 02:32

Really?…Huh…maybe my OWN memory is serving me wrong. I'll go back and test it again…

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Nested Loops...

(account deleted) 24 Nov 2012 17:10

I know this is mostly unrelated, but you could try using If's for a good "nested" loop:
ClrHome
1->A
1->B
1->C
While C=1
If A=1:Then
Disp "Hello World"
B+1->B:End
Pause
ClrHome
If B=4
0->C
End

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Last edited on 24 Nov 2012 17:18 by (account deleted) Show more

Re: Nested Loops...

Roguebantha 24 Nov 2012 18:59

This would just display Hello World four times would it not?

For(A,1,4)
Disp "Hello World"
Pause
ClrHome
End

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Re: Nested Loops...

(account deleted) 24 Nov 2012 19:00

Yeah, that would work good in that example, but then again, it was only an example…

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Coffee + Radiohead = ^^

Last edited on 29 Nov 2012 22:20 by (account deleted) Show more

Re: Nested Loops...

(account deleted) 24 Nov 2012 19:02

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Last edited on 29 Nov 2012 22:20 by (account deleted) Show more

Re: Fastest loop

(account deleted) 29 Nov 2012 22:14

Speaking of loops, is their a way to put a loop in a loop in a loop? I'm already using a Lbl, a While, and now, I have a menu, but the Lbl's in the While are canceling out the original one outside of it.

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Coffee + Radiohead = ^^

Last edited on 29 Nov 2012 22:15 by (account deleted) Show more

Re: Fastest loop

Silver Phantom 29 Nov 2012 22:42

ya, its easy, just make sure you use a different variable for each.

for(a,1,10
for(b,1,10
for(c,1,10
end
end
end

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The Silver Phantom welcomes you

Re: Fastest loop

(account deleted) 29 Nov 2012 22:45

I know that. :P Look…
Lbl 1
Menu…
[stuff]
While 1
[Lot's of stuff]
If…[more stuff]
Goto 1
[Stuff]
End

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Coffee + Radiohead = ^^

Last edited on 29 Nov 2012 22:48 by (account deleted) Show more

Re: Fastest loop

Silver Phantom 29 Nov 2012 23:36

you have to have the lbl in the while loop, http://tibasicdev.wikidot.com/while

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Boba Foxx (guest) 30 Nov 2012 13:21

aaah, memory leaks.

(account deleted) 02 Dec 2012 14:15

But then I have to start the While loop over, by going to Lbl 1 (which sets up functions for the program), and then that takes me to the menu again… Infinite loop.

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Coffee + Radiohead = ^^