Lipschitz continuity: Difference between revisions
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'''Elias delta code''' is a [[Universal code (data compression)|universal code]] encoding the positive integers developed by [[Peter Elias]]<ref name="Elias">{{cite journal | first = Peter | last = Elias | title = Universal codeword sets and representations of the integers | journal = [[IEEE Transactions on Information Theory]] | volume = 21 | issue = 2 | pages = 194–203 |date=March 1975 | url = http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=1055349}}</ref>{{rp|200}}. To code a number: | |||
#Write it in binary. | |||
#Count the bits and write down that number of bits in binary (X). | |||
#Use the binary representation written in step 1 again, remove the leading bit and write down the remaining bits (Y). | |||
#Append the second binary representation (Y) to the first binary representation (X). | |||
#Count the bits written in step 2 (X), subtract 1 from that number and prepend that many zeros. | |||
An equivalent way to express the same process: | |||
#Separate the integer into the highest power of 2 it contains (2<sup>''N' ''</sup>) and the remaining ''N''' binary digits of the integer. | |||
#Encode ''N = N' + 1'' with [[Elias gamma coding]]. | |||
#Append the remaining ''N''' binary digits to this representation of ''N''. | |||
To represent a number <math>x</math>, Elias delta uses <math>\lfloor \log_2(x) \rfloor + 2 \lfloor \log_2 (\lfloor \log_2(x) \rfloor +1) \rfloor + 1</math> bits<ref name="Elias"/>{{rp|200}}. | |||
The code begins, using <math>\gamma'</math> instead of <math>\gamma</math>: | |||
{| class="wikitable" | |||
! Number !! N' !! N !! Encoding !! Implied probability | |||
|- | |||
| 1 = 2<sup>0</sup> || 0 || 1 || 1 || 1/2 | |||
|- | |||
| 2 = 2<sup>1</sup> + ''0'' || 1 || 2 || 010''0'' || 1/16 | |||
|- | |||
| 3 = 2<sup>1</sup> + ''1'' || 1 || 2 || 010''1'' || " | |||
|- | |||
| 4 = 2<sup>2</sup> + ''0'' || 2 || 3 || 011''00'' || 1/32 | |||
|- | |||
| 5 = 2<sup>2</sup> + ''1'' || 2 || 3 || 011''01'' || " | |||
|- | |||
| 6 = 2<sup>2</sup> + ''2'' || 2 || 3 || 011''10'' || " | |||
|- | |||
| 7 = 2<sup>2</sup> + ''3'' || 2 || 3 || 011''11'' || " | |||
|- | |||
| 8 = 2<sup>3</sup> + ''0'' || 3 || 4 || 00100''000'' || 1/256 | |||
|- | |||
| 9 = 2<sup>3</sup> + ''1'' || 3 || 4 || 00100''001'' || " | |||
|- | |||
| 10 = 2<sup>3</sup> + ''2'' || 3 || 4 || 00100''010'' || " | |||
|- | |||
| 11 = 2<sup>3</sup> + ''3'' || 3 || 4 || 00100''011'' || " | |||
|- | |||
| 12 = 2<sup>3</sup> + ''4'' || 3 || 4 || 00100''100'' || " | |||
|- | |||
| 13 = 2<sup>3</sup> + ''5'' || 3 || 4 || 00100''101'' || " | |||
|- | |||
| 14 = 2<sup>3</sup> + ''6'' || 3 || 4 || 00100''110'' || " | |||
|- | |||
| 15 = 2<sup>3</sup> + ''7'' || 3 || 4 || 00100''111'' || " | |||
|- | |||
| 16 = 2<sup>4</sup> + ''0'' || 4 || 5 || 00101''0000'' || 1/512 | |||
|- | |||
| 17 = 2<sup>4</sup> + ''1'' || 4 || 5 || 00101''0001'' || " | |||
|} | |||
To decode an Elias delta-coded integer: | |||
#Read and count zeroes from the stream until you reach the first one. Call this count of zeroes ''L''. | |||
#Considering the one that was reached to be the first digit of an integer, with a value of 2<sup>''L''</sup>, read the remaining ''L'' digits of the integer. Call this integer ''N''. | |||
#Put a one in the first place of our final output, representing the value 2<sup>''N-1''</sup>. Read and append the following ''N-1'' digits. | |||
Example: | |||
001010001 | |||
1. 2 leading zeros in 001 | |||
2. read 2 more bits i.e. 00101 | |||
3. decode N = 00101 = 5 | |||
4. get N' = 5 - 1 = 4 remaining bits for the complete code i.e. '0001' | |||
5. encoded number = 2<sup>4</sup> + 1 = 17 | |||
This code can be generalized to zero or negative integers in the same ways described in [[Elias gamma coding#Generalizations|Elias gamma coding]]. | |||
== Example code == | |||
=== Encoding === | |||
<source lang="cpp"> | |||
void eliasDeltaEncode(char* source, char* dest) | |||
{ | |||
IntReader intreader(source); | |||
BitWriter bitwriter(dest); | |||
while (intreader.hasLeft()) | |||
{ | |||
int num = intreader.getInt(); | |||
int len = 0; | |||
int lengthOfLen = 0; | |||
for (int temp = num; temp > 0; temp >>= 1) // calculate 1+floor(log2(num)) | |||
len++; | |||
for (int temp = len; temp > 1; temp >>= 1) // calculate floor(log2(len)) | |||
lengthOfLen++; | |||
for (int i = lengthOfLen; i > 0; --i) | |||
bitwriter.outputBit(0); | |||
for (int i = lengthOfLen; i >= 0; --i) | |||
bitwriter.outputBit((len >> i) & 1); | |||
for (int i = len-2; i >= 0; i--) | |||
bitwriter.outputBit((num >> i) & 1); | |||
} | |||
bitwriter.close(); | |||
intreader.close(); | |||
} | |||
</source> | |||
=== Decoding === | |||
<source lang="cpp"> | |||
void eliasDeltaDecode(char* source, char* dest) | |||
{ | |||
BitReader bitreader(source); | |||
IntWriter intwriter(dest); | |||
while (bitreader.hasLeft()) | |||
{ | |||
int num = 1; | |||
int len = 1; | |||
int lengthOfLen = 0; | |||
while (!bitreader.inputBit()) // potentially dangerous with malformed files. | |||
lengthOfLen++; | |||
for (int i = 0; i < lengthOfLen; i++) | |||
{ | |||
len <<= 1; | |||
if (bitreader.inputBit()) | |||
len |= 1; | |||
} | |||
for (int i = 0; i < len-1; i++) | |||
{ | |||
num <<= 1; | |||
if (bitreader.inputBit()) | |||
num |= 1; | |||
} | |||
intwriter.putInt(num); // write out the value | |||
} | |||
bitreader.close(); | |||
intwriter.close(); | |||
} | |||
</source> | |||
== Generalizations ==<!-- This section is linked from [[Elias gamma coding]] --> | |||
Elias delta coding does not code zero or negative integers. | |||
One way to code all non negative integers is to add 1 before coding and then subtract 1 after decoding. | |||
One way to code all integers is to set up a [[bijection]], mapping integers all integers (0, 1, -1, 2, -2, 3, -3, ...) to strictly positive integers (1, 2, 3, 4, 5, 6, 7, ...) before coding. | |||
== References == | |||
<references/> | |||
{{Compression Methods}} | |||
== See also == | |||
*[[Elias gamma coding]] | |||
*[[Elias omega coding]] | |||
[[Category:Numeral systems]] | |||
[[Category:Lossless compression algorithms]] |
Revision as of 14:04, 28 January 2014
Elias delta code is a universal code encoding the positive integers developed by Peter Elias[1]Primarily based on the most recent URA personal property value index (PPPI) flash estimates, we know that the PPPI, which represents the overall real property price development, has dipped in 2013Q4. That is the first dip the market has seen within the final 2 years.
To give you some perspective, the entire number of personal properties in Singapore (together with govt condominiums) is 297,689 in 2013Q3. Primarily based on the projection that there will be 19,302 units accomplished in 2014, the rise in residential models works out to be more than 6%. With a lot New Ec Launch Singapore provide, buyers might be spoilt for alternative and this in flip will lead to their reluctance to pay a premium for potential models. The complete textual content of the Copyright Act (Cap sixty three) and different statutes regarding IPR might be found on the Singapore Statutes Online Website online The Group's income jumped forty.1 p.c to $324.5 million from $231.6 million in FY 2013, lifted by increased development income and sales of growth properties in Singapore and China. Actual Estate Shopping for
One factor we've on this nation is a big group of "economists," and "market analysts." What's interesting about this group of real property market-watchers is that there are two very other ways wherein they predict Boomers will affect housing markets over the subsequent decade. Let's check out those two opposites and see how every can change the best way real property investors strategy their markets. The good news is that actual property buyers are prepared for either state of affairs, and there's profit in being ready. I'm excited and searching ahead to the alternatives both or each of these conditions will supply; thank you Boomers! Mapletree to further broaden past Asia Why fortune will favour the brave in Asia's closing real property frontier
The story of the 23.2 home begins with a stack of Douglas fir beams salvaged from varied demolished warehouses owned by the consumer's household for a number of generations. Design and structure innovator Omer Arbel, configured them to type a triangulated roof, which makes up one of the placing features of the home. The transient from the entrepreneur-proprietor was not solely to design a house that integrates antique wood beams, however one which erases the excellence between inside and exterior. Built on a gentle slope on a large rural acreage surrounded by two masses of previous-development forests, the indoors movement seamlessly to the outdoors and, from the within looking, one enjoys unobstructed views of the existing natural panorama which is preserved
First, there are typically extra rental transactions than gross sales transactions, to permit AV to be decided for each property primarily based on comparable properties. Second, movements in sale costs are more unstable than leases. Hence, utilizing rental transactions to derive the AV helps to maintain property tax more steady for property homeowners. If you're buying or trying to lease a property. It's tiring to call up individual property agent, organize appointments, coordinate timing and to go for particular person property viewing. What most individuals do is to have a property agent representing them who will arrange and coordinate the viewings for all the properties out there based mostly on your necessities & most well-liked timing. Rent Property District 12 Rent Property District thirteen
The Annual Worth of a property is mostly derived based mostly on the estimated annual hire that it may well fetch if it have been rented out. In determining the Annual Worth of a property, IRAS will think about the leases of similar properties within the vicinity, dimension and condition of the property, and different relevant components. The Annual Worth of a property is determined in the identical method regardless of whether the property is let-out, proprietor-occupied or vacant. The Annual Worth of land is determined at 5% of the market price of the land. When a constructing is demolished, the Annual Worth of the land is assessed by this method. Property Tax on Residential Properties Buyer Stamp Responsibility on Buy of Properties – Business and residential properties Rent House District 01
Within the event the Bank's valuation is decrease than the acquisition price, the purchaser has to pay the distinction between the purchase value and the Bank's valuation utilizing money. As such, the money required up-front might be increased so it's at all times essential to know the valuation of the property before making any offer. Appoint Lawyer The Bank will prepare for a proper valuation of the property by way of physical inspection The completion statement will present you the balance of the acquisition price that you must pay after deducting any deposit, pro-rated property tax and utility costs, upkeep prices, and different relevant expenses in addition to any fees payable to the agent and the lawyer. Stamp Responsibility Primarily based on the Purchase Price or Market Value, whichever is larger. To code a number:
- Write it in binary.
- Count the bits and write down that number of bits in binary (X).
- Use the binary representation written in step 1 again, remove the leading bit and write down the remaining bits (Y).
- Append the second binary representation (Y) to the first binary representation (X).
- Count the bits written in step 2 (X), subtract 1 from that number and prepend that many zeros.
An equivalent way to express the same process:
- Separate the integer into the highest power of 2 it contains (2N' ) and the remaining N' binary digits of the integer.
- Encode N = N' + 1 with Elias gamma coding.
- Append the remaining N' binary digits to this representation of N.
To represent a number , Elias delta uses bits[1]Primarily based on the most recent URA personal property value index (PPPI) flash estimates, we know that the PPPI, which represents the overall real property price development, has dipped in 2013Q4. That is the first dip the market has seen within the final 2 years.
To give you some perspective, the entire number of personal properties in Singapore (together with govt condominiums) is 297,689 in 2013Q3. Primarily based on the projection that there will be 19,302 units accomplished in 2014, the rise in residential models works out to be more than 6%. With a lot New Ec Launch Singapore provide, buyers might be spoilt for alternative and this in flip will lead to their reluctance to pay a premium for potential models. The complete textual content of the Copyright Act (Cap sixty three) and different statutes regarding IPR might be found on the Singapore Statutes Online Website online The Group's income jumped forty.1 p.c to $324.5 million from $231.6 million in FY 2013, lifted by increased development income and sales of growth properties in Singapore and China. Actual Estate Shopping for
One factor we've on this nation is a big group of "economists," and "market analysts." What's interesting about this group of real property market-watchers is that there are two very other ways wherein they predict Boomers will affect housing markets over the subsequent decade. Let's check out those two opposites and see how every can change the best way real property investors strategy their markets. The good news is that actual property buyers are prepared for either state of affairs, and there's profit in being ready. I'm excited and searching ahead to the alternatives both or each of these conditions will supply; thank you Boomers! Mapletree to further broaden past Asia Why fortune will favour the brave in Asia's closing real property frontier
The story of the 23.2 home begins with a stack of Douglas fir beams salvaged from varied demolished warehouses owned by the consumer's household for a number of generations. Design and structure innovator Omer Arbel, configured them to type a triangulated roof, which makes up one of the placing features of the home. The transient from the entrepreneur-proprietor was not solely to design a house that integrates antique wood beams, however one which erases the excellence between inside and exterior. Built on a gentle slope on a large rural acreage surrounded by two masses of previous-development forests, the indoors movement seamlessly to the outdoors and, from the within looking, one enjoys unobstructed views of the existing natural panorama which is preserved
First, there are typically extra rental transactions than gross sales transactions, to permit AV to be decided for each property primarily based on comparable properties. Second, movements in sale costs are more unstable than leases. Hence, utilizing rental transactions to derive the AV helps to maintain property tax more steady for property homeowners. If you're buying or trying to lease a property. It's tiring to call up individual property agent, organize appointments, coordinate timing and to go for particular person property viewing. What most individuals do is to have a property agent representing them who will arrange and coordinate the viewings for all the properties out there based mostly on your necessities & most well-liked timing. Rent Property District 12 Rent Property District thirteen
The Annual Worth of a property is mostly derived based mostly on the estimated annual hire that it may well fetch if it have been rented out. In determining the Annual Worth of a property, IRAS will think about the leases of similar properties within the vicinity, dimension and condition of the property, and different relevant components. The Annual Worth of a property is determined in the identical method regardless of whether the property is let-out, proprietor-occupied or vacant. The Annual Worth of land is determined at 5% of the market price of the land. When a constructing is demolished, the Annual Worth of the land is assessed by this method. Property Tax on Residential Properties Buyer Stamp Responsibility on Buy of Properties – Business and residential properties Rent House District 01
Within the event the Bank's valuation is decrease than the acquisition price, the purchaser has to pay the distinction between the purchase value and the Bank's valuation utilizing money. As such, the money required up-front might be increased so it's at all times essential to know the valuation of the property before making any offer. Appoint Lawyer The Bank will prepare for a proper valuation of the property by way of physical inspection The completion statement will present you the balance of the acquisition price that you must pay after deducting any deposit, pro-rated property tax and utility costs, upkeep prices, and different relevant expenses in addition to any fees payable to the agent and the lawyer. Stamp Responsibility Primarily based on the Purchase Price or Market Value, whichever is larger.
The code begins, using instead of :
Number | N' | N | Encoding | Implied probability |
---|---|---|---|---|
1 = 20 | 0 | 1 | 1 | 1/2 |
2 = 21 + 0 | 1 | 2 | 0100 | 1/16 |
3 = 21 + 1 | 1 | 2 | 0101 | " |
4 = 22 + 0 | 2 | 3 | 01100 | 1/32 |
5 = 22 + 1 | 2 | 3 | 01101 | " |
6 = 22 + 2 | 2 | 3 | 01110 | " |
7 = 22 + 3 | 2 | 3 | 01111 | " |
8 = 23 + 0 | 3 | 4 | 00100000 | 1/256 |
9 = 23 + 1 | 3 | 4 | 00100001 | " |
10 = 23 + 2 | 3 | 4 | 00100010 | " |
11 = 23 + 3 | 3 | 4 | 00100011 | " |
12 = 23 + 4 | 3 | 4 | 00100100 | " |
13 = 23 + 5 | 3 | 4 | 00100101 | " |
14 = 23 + 6 | 3 | 4 | 00100110 | " |
15 = 23 + 7 | 3 | 4 | 00100111 | " |
16 = 24 + 0 | 4 | 5 | 001010000 | 1/512 |
17 = 24 + 1 | 4 | 5 | 001010001 | " |
To decode an Elias delta-coded integer:
- Read and count zeroes from the stream until you reach the first one. Call this count of zeroes L.
- Considering the one that was reached to be the first digit of an integer, with a value of 2L, read the remaining L digits of the integer. Call this integer N.
- Put a one in the first place of our final output, representing the value 2N-1. Read and append the following N-1 digits.
Example:
001010001 1. 2 leading zeros in 001 2. read 2 more bits i.e. 00101 3. decode N = 00101 = 5 4. get N' = 5 - 1 = 4 remaining bits for the complete code i.e. '0001' 5. encoded number = 24 + 1 = 17
This code can be generalized to zero or negative integers in the same ways described in Elias gamma coding.
Example code
Encoding
void eliasDeltaEncode(char* source, char* dest)
{
IntReader intreader(source);
BitWriter bitwriter(dest);
while (intreader.hasLeft())
{
int num = intreader.getInt();
int len = 0;
int lengthOfLen = 0;
for (int temp = num; temp > 0; temp >>= 1) // calculate 1+floor(log2(num))
len++;
for (int temp = len; temp > 1; temp >>= 1) // calculate floor(log2(len))
lengthOfLen++;
for (int i = lengthOfLen; i > 0; --i)
bitwriter.outputBit(0);
for (int i = lengthOfLen; i >= 0; --i)
bitwriter.outputBit((len >> i) & 1);
for (int i = len-2; i >= 0; i--)
bitwriter.outputBit((num >> i) & 1);
}
bitwriter.close();
intreader.close();
}
Decoding
void eliasDeltaDecode(char* source, char* dest)
{
BitReader bitreader(source);
IntWriter intwriter(dest);
while (bitreader.hasLeft())
{
int num = 1;
int len = 1;
int lengthOfLen = 0;
while (!bitreader.inputBit()) // potentially dangerous with malformed files.
lengthOfLen++;
for (int i = 0; i < lengthOfLen; i++)
{
len <<= 1;
if (bitreader.inputBit())
len |= 1;
}
for (int i = 0; i < len-1; i++)
{
num <<= 1;
if (bitreader.inputBit())
num |= 1;
}
intwriter.putInt(num); // write out the value
}
bitreader.close();
intwriter.close();
}
Generalizations
Elias delta coding does not code zero or negative integers. One way to code all non negative integers is to add 1 before coding and then subtract 1 after decoding. One way to code all integers is to set up a bijection, mapping integers all integers (0, 1, -1, 2, -2, 3, -3, ...) to strictly positive integers (1, 2, 3, 4, 5, 6, 7, ...) before coding.
References
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