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Undocumented Tricks in Basic
This is an archived, read-only copy of the United-TI subforum , including posts and topic from May 2003 to April 2012. If you would like to discuss any of the topics in this forum, you can visit Cemetech's TI-BASIC subforum. Some of these topics may also be directly-linked to active Cemetech topics. If you are a Cemetech member with a linked United-TI account, you can link United-TI topics here with your current Cemetech topics.

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Undocumented Tricks in Basic
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62 52 53 53
Formerly known as 62 52 53 53


Active Member


Joined: 30 May 2003
Posts: 607
Posted: 11 Jun 2003 06:43:00 pm    Post subject:
They were stolen by ducks.

Back to basic: if you ever need to compress a list, and all the numbers in it are positive, you can do RLE using -A,B where B is the repeated number, and +A is the number of times to copy it. (I told you I was crazy, and see, I compress lists in basic.)
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NETWizz
Byte by bit


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Joined: 20 May 2003
Posts: 2369
Posted: 11 Jun 2003 06:56:02 pm    Post subject:
Each list element is 9 bytes, so you can actually compress each element.
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Arcane Wizard
`semi-hippie`


Super Elite (Last Title)


Joined: 02 Jun 2003
Posts: 8993
Posted: 12 Jun 2003 05:37:56 am    Post subject:
What is RLE exactly ?
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62 52 53 53
Formerly known as 62 52 53 53


Active Member


Joined: 30 May 2003
Posts: 607
Posted: 12 Jun 2003 07:58:15 am    Post subject:
RLE is a compression routine. Data occurring more than 3 times in a row is compressed as Flag byte, data byte, times to copy byte.
FF is the most common flag byte
4 is often subtracted from the times to copy byte, so:
FF 04 03 would decompress as 04 04 04 04 04 04 04
because the flag (FF) says the next two bytes are compressed data, and 04 is coppied 03+04 times, so you have seven 04s in a row

In my case, -? was the flag element and the times-to-copy element, because the fact of it being negative was the flag, the ? was the number of times to copy. the next element was the data
-4,23 would decompress as 23,23,23,23
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Darth Android
DragonOS Dev Team


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Joined: 31 May 2003
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Posted: 12 Jun 2003 09:49:05 am    Post subject:
BTW, RLE stands for Run Length Encoding.
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Darth Android
DragonOS Dev Team


Bandwidth Hog


Joined: 31 May 2003
Posts: 2104
Posted: 12 Jun 2003 09:50:13 am    Post subject:
or u could just convert the list 2 a string


Code:
"{->Str2
For(A,1,dim(LLIST
LLIST(A->N
prgm(theta)N2S
Str2+Str1+",->Str2
End
Str2+"}->Str2


simple decompress:

Code:
expr(Str2->LLIST


Last edited by Guest on 12 Jun 2003 09:56:21 am; edited 1 time in total
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gorchy


Newbie


Joined: 30 May 2003
Posts: 19
Posted: 12 Jun 2003 12:32:10 pm    Post subject:
Confused what sens has compressing a list Confused
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Arcane Wizard
`semi-hippie`


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Joined: 02 Jun 2003
Posts: 8993
Posted: 12 Jun 2003 01:36:51 pm    Post subject:
Saving memory.
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62 52 53 53
Formerly known as 62 52 53 53


Active Member


Joined: 30 May 2003
Posts: 607
Posted: 12 Jun 2003 02:21:46 pm    Post subject:
Especially since my list is rather redundant
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NETWizz
Byte by bit


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Joined: 20 May 2003
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Posted: 13 Jun 2003 02:09:28 am    Post subject:
Not only that, each element of a list is a 9 byte floating #.

Think of how much space is wasted!
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Darth Android
DragonOS Dev Team


Bandwidth Hog


Joined: 31 May 2003
Posts: 2104
Posted: 13 Jun 2003 06:09:27 am    Post subject:
especially if a list element is "0". 9b -> 1b (bytes, not binary).
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Toksyuryel
Crimson Dragon Software


Elite


Joined: 14 Jun 2003
Posts: 880
Posted: 21 Jun 2003 02:45:54 pm    Post subject:
HELP! I'm trying to make a program that compresses pics and lists, and I need some good algorythms. By the way, strings are kind of a bad option for me because of the filenaming conventions used by my program. Thx.
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Spyderbyte


Advanced Member


Joined: 29 May 2003
Posts: 372
Posted: 21 Jun 2003 09:17:35 pm    Post subject:
There was a whole section at Cirrus about this. Check it out:

Picture Compression

Hope this helps!

Spyderbyte
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JesusFreak
JesusFreak


Active Member


Joined: 17 Jun 2003
Posts: 537
Posted: 24 Jun 2003 11:15:27 am    Post subject:
Evil or Very Mad Evil or Very Mad Evil or Very Mad Evil or Very Mad Evil or Very Mad
Is there a prgm that you know of that will do this?

Or is there one that will store it and then make and restore it as a pic,
like your pic is pic 1 but you put another game on that uses pic 1. so if you run that prgm it will remake and stor the pic as 1?
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yugniht


Member


Joined: 29 May 2003
Posts: 167
Posted: 09 Jul 2003 08:53:49 pm    Post subject:
I don't think these are undocumented, but maybe just hard to find...maybe

1.)you can find out how many digits are in a number with: int(log(# or variable)+1)

2.)If you ran out of variables, pretty hard to do but I guess it can happen, just go to the Finance menu, under the "Apps" button for the 83+, and press the right arrow button so that you are now on the variables menu. You can use just about any of these to store a number to. If I remember right, you can't Delvar "whatever variable here" but instead, you must do 0->"whatever variable here"
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Adm.Wiggin
aka Tianon


Know-It-All


Joined: 02 Jun 2003
Posts: 1874
Posted: 09 Jul 2003 11:00:18 pm    Post subject:
u could use lists if u run out (of the extras...)...

Last edited by Guest on 09 Jul 2003 11:00:30 pm; edited 1 time in total
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Darth Android
DragonOS Dev Team


Bandwidth Hog


Joined: 31 May 2003
Posts: 2104
Posted: 14 Jul 2003 03:08:31 pm    Post subject:
thats a lot of variables if u have to go to lists. i use lists as to not have to mess with the user's variables, so he/she doesnt have to worry about them being deleted
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Arcane Wizard
`semi-hippie`


Super Elite (Last Title)


Joined: 02 Jun 2003
Posts: 8993
Posted: 14 Jul 2003 07:04:33 pm    Post subject:
And you don't have to worry about your data getting messed up. Usefull in lists that save progress in rpg's for example.
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JacobdeHaan


Member


Joined: 10 Jul 2003
Posts: 165
Posted: 17 Jul 2003 01:41:28 am    Post subject:
Well, I accidentally came up with this one (all by myself Very Happy I'm so proud *sniff*:
If you have your screen zoomed out (like the area where a pixel equals a point) you can make a "blind"-like command using just the GridOn command.
I know it is kinda slow, but it is pretty small and neat.
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Tyler


Advanced Member


Joined: 29 May 2003
Posts: 352
Posted: 17 Jul 2003 12:24:51 pm    Post subject:
...A pixel is always a point on the screen...
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