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62 52 53 53
Formerly known as 62 52 53 53
Active Member
Joined: 30 May 2003
Posts: 607
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 Posted: 11 Jun 2003 06:43:00 pm Post subject: |
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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
Bandwidth Hog
Joined: 20 May 2003
Posts: 2369
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| Posted: 11 Jun 2003 06:56:02 pm Post subject: |
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| 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
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| Posted: 12 Jun 2003 05:37:56 am Post subject: |
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| 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
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| Posted: 12 Jun 2003 07:58:15 am Post subject: |
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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
Bandwidth Hog
Joined: 31 May 2003
Posts: 2104
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| Posted: 12 Jun 2003 09:49:05 am Post subject: |
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| BTW, RLE stands for Run Length Encoding. |
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Darth Android
DragonOS Dev Team
Bandwidth Hog
Joined: 31 May 2003
Posts: 2104
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| Posted: 12 Jun 2003 09:50:13 am Post subject: |
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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
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| Posted: 12 Jun 2003 12:32:10 pm Post subject: |
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 what sens has compressing a list |
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Arcane Wizard
`semi-hippie`
Super Elite (Last Title)
Joined: 02 Jun 2003
Posts: 8993
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| Posted: 12 Jun 2003 01:36:51 pm Post subject: |
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| 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
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| Posted: 12 Jun 2003 02:21:46 pm Post subject: |
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| Especially since my list is rather redundant |
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NETWizz
Byte by bit
Bandwidth Hog
Joined: 20 May 2003
Posts: 2369
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| Posted: 13 Jun 2003 02:09:28 am Post subject: |
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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
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| Posted: 13 Jun 2003 06:09:27 am Post subject: |
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| 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
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| Posted: 21 Jun 2003 02:45:54 pm Post subject: |
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| 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
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| Posted: 21 Jun 2003 09:17:35 pm Post subject: |
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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
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| Posted: 24 Jun 2003 11:15:27 am Post subject: |
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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
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| Posted: 09 Jul 2003 08:53:49 pm Post subject: |
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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
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| Posted: 09 Jul 2003 11:00:18 pm Post subject: |
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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
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Joined: 31 May 2003
Posts: 2104
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| Posted: 14 Jul 2003 03:08:31 pm Post subject: |
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| 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
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| Posted: 14 Jul 2003 07:04:33 pm Post subject: |
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| 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
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| Posted: 17 Jul 2003 01:41:28 am Post subject: |
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Well, I accidentally came up with this one (all by myself  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
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| Posted: 17 Jul 2003 12:24:51 pm Post subject: |
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| ...A pixel is always a point on the screen... |
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TI-Basic => TI-BASIC
