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When using LZ77 why is the compressed message longer than the decompressed version?
Dictionary coders (such as LZ77) store a segment of the message in a dictionary, and then replace each occurrence with the index into the dictionary. This works very well for repeated values, or messages that use a small portion of the possible values (such as 26 letters out of the 256 possible values in a byte). However, if the data does not repeat, or uses almost all of the possible values randomly, there will be the space used for the dictionary PLUS the space used for indexes of single occurrences. This can make the message longer.
In general terms, if the message entropy is too high, any lossless compression scheme will fail to compress the data.
What else can I help you with?
What is difference between symmetric and asymmetric compression?
symmetric compressionA data compression technique that takes about the same amount of time to compress as it does to decompress.asymmetric compressionA data compression technique that typically takes more time to compress than it does to decompress. Some asymmetric compression methods take longer to decompress, which would be suited for backup files that are constantly being compressed and rarely decompressed.
What happens when files that contain large amounts of information are zipped or compressed?
You can no longer view these files, but they will take up less space on your hard drive. If you want to view them again, just unzip it (pretty much the same way you zipped it). Compressing files is good for sending them to someone, or if you need more space on your hard drive. It gets smaller.
Download link of jdk1.5?
JDK 1.5, also known as Java 5, is an outdated version of the Java Development Kit and is no longer officially supported by Oracle. For security and compatibility reasons, it is recommended to use a more recent version of the JDK. If you still need JDK 1.5 for legacy purposes, you may find it on third-party archive sites, but exercise caution as these versions may not be safe. Always prefer the latest supported version for development.
How is a nerve message different from a hormone message?
Hormone messageA hormone message is a chemical, and a hormone affects target organs and a nerve message is an electrical impulse hormone travels through the blood. A hormone has long lasting effects. A hormone is secreted by a glandNerve messageA nerve message affects the receiver. A nerve message goes through a nerve and a nerve message has very short term effects. A nerve message is initiated by a response to an exterior alteration.
Can deleting zip files harm your computer?
No. There is no problem in deleting zip files. They are just left behind after file downloads. .zip files are compressed archives, containing 1 or more files. Deleting a .zip file will not harm your computer, as they are not system files. If you delete a .zip file, all you will lose is the files contained within. If you have already extracted the files, or if you no longer need them, they are perfectly safe to delete.
What is difference between symmetric and asymmetric compression?
symmetric compressionA data compression technique that takes about the same amount of time to compress as it does to decompress.asymmetric compressionA data compression technique that typically takes more time to compress than it does to decompress. Some asymmetric compression methods take longer to decompress, which would be suited for backup files that are constantly being compressed and rarely decompressed.
I keep getting on my computer a message that says "This version of Goggle Chrome is no longer supported. Please upgrade to a supported browser." How do I do that I'd be grateful for some help. Thanks?
I think that means that your computer is too old and can no longer be used for certain things
What is the longer version e'er?
"E'er" is the short version of "Ever".
Is photo a short version or a longer word?
"Photo" is a shortened version of "photograph," which is the longer word referring to an image taken with a camera.
Why cant a substance no longer be compressed when changes from gas to liquid?
A lquid has a more compact structure.
What is the longer version of the Math pie?
3.141592384762674804028235255377458858477936458230261731357608653773216
What is the longer version of zoo?
Zoological garden
Why does it say 'new message' but when you check your message board it says no messages?
There could of been a message from someone that deleted their profile. This could give you a new message notification and the message isn't there any longer.
How much is emerald version?
Cheap, but no longer in stores. :(
You just compressed your C drive to save disk space but now you cannot hear your audio - why?
music (and video) files are allready in a compressed format - when you attempt to compress (or even encrypt) them the music decoder will no longer be able to recognize them and either will give an error message telling you as such or will corrupt the file(s). The next time you want to compress your hdd to save (just a tiny amount of) disc space, EXCLUDE ALL OF YOUR MEDIA FILES!!!
How do you use uncut in a sentence?
The Director's version of the movie was uncut, making it longer than the edited version.
Why doesn't iPhoto let me have a 4.0.3 version on a mac?
iPhoto version 4 is quite an old version and is probably no longer compatible with a modern Mac.
