Latent Dirichlet allocation: Difference between revisions

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'''Simple rational approximation (SRA)''' is a subset of [[Interpolation|interpolating]] methods using [[rational function]]s. Especially, SRA interpolates a given function with a specific rational function whose [[pole (complex analysis)|pole]]s and [[root of a function|zeros]] are [[simple]], which means that there is no multiplicity in poles and zeros. Sometimes, it only implies simple poles.
 
The main application of SRA lies in finding the [[root of a function|zeros]] of [[secular function]]s. A [[divide-and-conquer algorithm]] to find the [[eigenvalues]] and [[eigenvectors]] for various kinds of [[Matrix (mathematics)|matrices]] is well known in [[numerical analysis]]. In a strict sense, SRA implies a specific [[interpolation]] using simple rational functions as a part of the divide-and-conquer algorithm. Since such secular functions consist of a series of rational functions with simple poles, SRA is the best candidate to interpolate the zeros of the secular function. Moreover, based on previous researches, a simple zero that lies between two adjacent poles can be considerably well interpolated by using a two-dominant-pole rational function as an approximating function.
 
== One-point third-order iterative method: Halley's formula ==
The origin of the interpolation with rational functions can be found in the previous work done by [[Edmond Halley]]. [[Halley's method|Halley's formula]] is known as one-point third-order iterative method to solve <math>\,f(x)=0</math> by means of approximating a rational function defined by
:<math>h(z)=\frac{a}{z+b}+c.</math>
We can determine a, b, and c so that
:<math>h^{(i)}(x)=f^{(i)}(x), \qquad i=0,1,2.</math>
Then solving <math>\,h(z)=0</math> yields the iteration
:<math>x_{n+1}=x_{n}-\frac{f(x_n)}{f'(x_n)} \left({\frac{1}{1-\frac{f(x_n)f''(x_n)}{2(f'(x_n))^2}}}\right).</math>
This is referred to as Halley's formula.
This ''geometrical interpretation'' <math>h(z)</math> was derived by Gander(1978), where the equivalent iteration also was derived by applying Newton's method to
:<math>g(x)=\frac{f(x)}{\sqrt{f'(x)}}=0.</math>
We call this ''algebraic interpretation'' <math>g(x)</math> of Halley's formula.
 
==One-point second-order iterative method: Simple rational approximation==
Similarly, we can derive a variation of Halley's formula based on a one-point ''second-order'' iterative method to solve <math>\,f(x)=\alpha(\neq 0)</math> using simple rational approximation by
:<math>h(z)=\frac{a}{z+b}.</math>
Then we need to evaluate
:<math>h^{(i)}(x)=f^{(i)}(x), \qquad i=0,1.</math>
Thus we have
:<math>x_{n+1}=x_{n}-\frac{f(x_n)-\alpha}{f'(x_n)} \left(\frac{f(x_n)}{\alpha}\right).</math>
The algebraic interpretation of this iteration is obtained by solving
:<math>g(x)=1-\frac{\alpha}{{f(x)}}=0.</math>
This one-point second-order method is known to show a locally quadratic convergence if the root of equation is simple.
SRA strictly implies this one-point second-order interpolation by a simple rational function.
 
We can notice that even third order method is a variation of Newton's method. We see the Newton's steps are multiplied by some factors. These factors are called the ''convergence factors'' of the variations, which are useful for analyzing the rate of convergence. See Gander(1978).
 
== References ==
*{{citation
| last = Demmel | first = James W. | authorlink = James Demmel
| mr = 1463942
| isbn = 0-89871-389-7
| location = Philadelphia, PA
| publisher = [[Society for Industrial and Applied Mathematics]]
| title = Applied Numerical Linear Algebra
| year = 1997}}.
*{{citation
| last1 = Elhay | first1 = S.
| last2 = Golub | first2 = G. H. | author2-link = Gene H. Golub
| last3 = Ram | first3 = Y. M.
| doi = 10.1016/S0898-1221(03)90229-X
| mr = 2020255
| issue = 8–9
| journal = Computers & Mathematics with Applications
| pages = 1413–1426
| title = The spectrum of a modified linear pencil
| volume = 46
| year = 2003}}.
*{{citation
| last1 = Gu | first1 = Ming
| last2 = Eisenstat | first2 = Stanley C.
| doi = 10.1137/S0895479892241287
| mr = 1311425
| issue = 1
| journal = SIAM Journal on Matrix Analysis and Applications
| pages = 172–191
| title = A divide-and-conquer algorithm for the symmetric tridiagonal eigenproblem
| volume = 16
| year = 1995}}.
*{{citation
| last = Gander | first = Walter
| publisher = [[Stanford University]], School of Humanities and Sciences, Computer Science Dept.
| title = On the linear least squares problem with a quadratic constraint
| year = 1978}}.
 
[[Category:Interpolation]]

Revision as of 13:01, 24 January 2014

Simple rational approximation (SRA) is a subset of interpolating methods using rational functions. Especially, SRA interpolates a given function with a specific rational function whose poles and zeros are simple, which means that there is no multiplicity in poles and zeros. Sometimes, it only implies simple poles.

The main application of SRA lies in finding the zeros of secular functions. A divide-and-conquer algorithm to find the eigenvalues and eigenvectors for various kinds of matrices is well known in numerical analysis. In a strict sense, SRA implies a specific interpolation using simple rational functions as a part of the divide-and-conquer algorithm. Since such secular functions consist of a series of rational functions with simple poles, SRA is the best candidate to interpolate the zeros of the secular function. Moreover, based on previous researches, a simple zero that lies between two adjacent poles can be considerably well interpolated by using a two-dominant-pole rational function as an approximating function.

One-point third-order iterative method: Halley's formula

The origin of the interpolation with rational functions can be found in the previous work done by Edmond Halley. Halley's formula is known as one-point third-order iterative method to solve by means of approximating a rational function defined by

We can determine a, b, and c so that

Then solving yields the iteration

This is referred to as Halley's formula. This geometrical interpretation was derived by Gander(1978), where the equivalent iteration also was derived by applying Newton's method to

We call this algebraic interpretation of Halley's formula.

One-point second-order iterative method: Simple rational approximation

Similarly, we can derive a variation of Halley's formula based on a one-point second-order iterative method to solve using simple rational approximation by

Then we need to evaluate

Thus we have

The algebraic interpretation of this iteration is obtained by solving

This one-point second-order method is known to show a locally quadratic convergence if the root of equation is simple. SRA strictly implies this one-point second-order interpolation by a simple rational function.

We can notice that even third order method is a variation of Newton's method. We see the Newton's steps are multiplied by some factors. These factors are called the convergence factors of the variations, which are useful for analyzing the rate of convergence. See Gander(1978).

References

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    15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.

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  • Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.

    Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.

    In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.

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    Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.

    15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.

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  • Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.

    Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.

    In case you are in search of an actual estate or Singapore property agent on-line, you simply should belief your intuition. It's because you do not know which agent is nice and which agent will not be. Carry out research on several brokers by looking out the internet. As soon as if you end up positive that a selected agent is dependable and reliable, you can choose to utilize his partnerise in finding you a home in Singapore. Most of the time, a property agent is taken into account to be good if he or she locations the contact data on his website. This may mean that the agent does not mind you calling them and asking them any questions relating to new properties in singapore in Singapore. After chatting with them you too can see them in their office after taking an appointment.

    Have handed an trade examination i.e Widespread Examination for House Brokers (CEHA) or Actual Property Agency (REA) examination, or equal; Exclusive brokers are extra keen to share listing information thus making certain the widest doable coverage inside the real estate community via Multiple Listings and Networking. Accepting a severe provide is simpler since your agent is totally conscious of all advertising activity related with your property. This reduces your having to check with a number of agents for some other offers. Price control is easily achieved. Paint work in good restore-discuss with your Property Marketing consultant if main works are still to be done. Softening in residential property prices proceed, led by 2.8 per cent decline within the index for Remainder of Central Region

    Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.

    15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.

    To achieve the very best outcomes, you must be always updated on market situations, including past transaction information and reliable projections. You could review and examine comparable homes that are currently available in the market, especially these which have been sold or not bought up to now six months. You'll be able to see a pattern of such report by clicking here It's essential to defend yourself in opposition to unscrupulous patrons. They are often very skilled in using highly unethical and manipulative techniques to try and lure you into a lure. That you must also protect your self, your loved ones, and personal belongings as you'll be serving many strangers in your home. Sign a listing itemizing of all of the objects provided by the proprietor, together with their situation. HSR Prime Recruiter 2010.