Quadratic Interpolation

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Conjugate Gradient Methods for Computing Weighted Analytic Center for Linear Matrix Inequalities Using Exact and Quadratic Interpolation Line Searches

Conjugate Gradient Methods for Computing Weighted Analytic Center for Linear Matrix Inequalities Using Exact and Quadratic Interpolation Line Searches

Abstract: We study the problem of computing the weighted analytic center for linear matrix inequality constraints. In this paper, we apply conjugate gradient (CG) methods to find the weighted analytic center. CG methods have low memory requirements and strong local and global convergence properties. The methods considered are the classical methods by Hestenes-Stiefel (HS), Fletcher and Reeves (FR), Polak and Ribiere (PR) and a relatively new method by Rivaie, Abashar, Mustafa and Ismail (RAMI). We compare performance of each method on random test problems by observing the number of iterations and time required by the method to find the weighted analytic center for each test problem. We use Newton’s method exact line search and Quadratic Interpolation inexact line search. Our numerical results show that PR is the best method, followed by HS, then RAMI, and then FR. However, PR and HS performed about the same with exact line search. The results also indicate that both line searches work well, but exact line search handles weights better than the inexact line search when some weight is relatively much larger than the other weights. We also find from our results that with Quadratic interpolation line search, FR is more susceptible to jamming phenomenon than both PR and HS.
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Antlion Optimization Algorithm Based on Quadratic Interpolation

Antlion Optimization Algorithm Based on Quadratic Interpolation

In ALO algorithm, the optimization process of ants is realized by random walking around the elite antlion and the antlion selected by roulette. But if the individual fitness of current elite antlion and current antlion selected by roulette are poor, maybe the algorithm will easy to fall into local optimum and slow down the convergence speed. The quadratic interpolation is an algorithm with strong local search ability, and it has the advantage of less computation. So use the QI to obtain the secondary renewal position of ants.

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Quadratic Interpolation and Linear Lifting Design

Quadratic Interpolation and Linear Lifting Design

The first part of this section is devoted to a more qualitative assessment of the proposed interpolation methods. A practi- cal reason impels to a nonexhaustive experimental setting. The proposed quadratic interpolation formulation is very rich and offers many different variants. The number of ex- periments to test all the possible variants is huge. The fol- lowing points show such a variability and explain the basic setting for the qualitative assessment. Experiments are done for several image classes: natural, textured images, synthetic, biomedical (mammography), and remote sensing (sea sur- face temperature, SST) images. Figure 3 shows an example image from our database for the synthetic, mammography, and SST image classes.
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Semi lagrangian methods

Semi lagrangian methods

Consider, therefore, a Lagrange quadratic interpolation using the three grid points closest to, and surrounding the point z :.. and let 6 be defined by.[r]

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A Novel Iterative Method for Nonlinear Equations

A Novel Iterative Method for Nonlinear Equations

Abstract—Based on the idea that the iterative error function can be applied to extrapolation to zero for SAM, a novel acceleration iterative scheme is obtained by using the quadratic interpolation error function. Furthermore, the new scheme is extended to the vector case and nonlinear equations, and the convergence order of the method proposed is always greater than or equal to two. Numerical results confirm the validity of the theoretical results.

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Image magnification by least squares surfaces

Image magnification by least squares surfaces

One of the features of the two linear interpolation methods is that, in the magnification ratio, artificial blocks and visual effects are undesirable, but edges are preserved at an acceptable level. In bi-cubic interpolation method with a high zoom ratio, artificial blocks and undesirable visual effects are lower, and the edges are preserved. Although determining the image quality is not easy in this method, for image magnification, the quadratic interpolation is better than bilinear interpolation, bi-cubic interpolation is better than quadratic interpolation, and spline interpolation is better than bi-cubic interpolation [16].
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Some recent developments in nonlinear optimization algorithms

Some recent developments in nonlinear optimization algorithms

The key idea of Sequential Quadratic Programming (SQP) is to model problem (17) at each iteration by an appropriate quadratic subproblem (i.e., a problem with a quadratic objective function and linear constraints), and to solve this subproblem to generate a next iterate. SQP methods are of the active-set variety, in the sense that, at each iteration, the set of active constraints at the solution of the quadratic subproblem supplies a guess of the correct active set of constraints at a solution of problem (17). SQP methods are the basis of some of the best software packages for solving constrained optimization problems, among which is SNOPT [22] (see Section 2.1.3).
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Quadratics Day 3

Quadratics Day 3

Some cannot be solved by any of these methods, but you can always use the Quadratic Formula to solve any quadratic equation... 9-9 The Quadratic Formula and the[r]

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Fractal Interpolation Functions: A Short Survey

Fractal Interpolation Functions: A Short Survey

The object of this short survey is to revive interest in the technique of fractal interpolation. In or- der to attract the attention of numerical analysts, or rather scientific community of researchers applying various approximation techniques, the article is interspersed with comparison of fractal interpolation functions and diverse conventional interpolation schemes. There are multitudes of interpolation methods using several families of functions: polynomial, exponential, rational, trigonometric and splines to name a few. But it should be noted that all these conventional nonre- cursive methods produce interpolants that are differentiable a number of times except possibly at a finite set of points. One of the goals of the paper is the definition of interpolants which are not smooth, and likely they are nowhere differentiable. They are defined by means of an appropriate iterated function system. Their appearance fills the gap of non-smooth methods in the field of ap- proximation. Another interesting topic is that, if one chooses the elements of the iterated function system suitably, the resulting fractal curve may be close to classical mathematical functions like polynomials, exponentials, etc. The authors review many results obtained in this field so far, al- though the article does not claim any completeness. Theory as well as applications concerning this new topic published in the last decade are discussed. The one dimensional case is only considered.
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Understanding Engineering Mathematics   John Bird   2014 pdf

Understanding Engineering Mathematics John Bird 2014 pdf

In practice, we always deduce the roots of a simple quadratic equation from the factors of the quadratic expression, as in the above example. However, we could reverse this process. If, by trial and error, we could deter- mine that x = 2 is a root of the equation x 2 + 2x − 8 = 0 we could deduce at once that ( x − 2 ) is a factor of the expression x 2 + 2x − 8. We wouldn’t normally solve quadratic equations this way – but suppose we have to factorise a cubic expression (i.e. one in which the highest power of the variable is 3). A cubic equation might have three simple linear factors and the difficulty of discovering all these factors by trial and error would be considerable. It is to deal with this kind of case that we use the factor theorem. This is just a generalised version of what we established above for the quadratic expression. The factor theorem provides a method of factorising any polynomial, f (x ), which has simple factors.
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The Rabinowitsch Mollin Williams Theorem Revisited

The Rabinowitsch Mollin Williams Theorem Revisited

The Rabinowitsch-Mollin-Williams Theorem is the real quadratic field analogue of the Rabinowitsch result, introduced in 1988, published in 2 by this author and Williams. In 2 and in subsequent renderings of the result, we considered all values of Δ. However, the case where Δ / ≡ 1mod 4 is essentially trivial, and the values unconditionally known for these Rabinowitsch polynomials are Δ ∈ {2, 3, 6, 7, 11}—see 3. Therefore, we consider only the interesting case, namely, Δ ≡ 1mod 4.

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Sparse-view tomography via displacement function interpolation

Sparse-view tomography via displacement function interpolation

The rotation effect of the linear interpolation method As a simple example to illustrate the main motivation, this paper first considers a naïve linear interpolation approach that doubles the number of views in tomog- raphy. Let the sinogram be p(n, m), where p is the line integral of the object, n is the detector bin index and m is the view angle index. In this example, when m is odd, the p(n, m) is measured. When m is even, the p(n, m) is not measured and needs to be estimated. A simple linear interpolation scheme to estimate p(n, 2 m) from p(n, 2 m-1) and p(n, 2 m + 1) is
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Robust solutions to box constrained stochastic linear variational inequality problem

Robust solutions to box constrained stochastic linear variational inequality problem

We present the first attempt to give the robust reformulation for solving the box- constrained stochastic linear variational inequality problem. For three types of uncertain variables, the robust reformulation of SLVI(l, u, F) can be solved as either a quadratically constrained quadratic program (QCQP) or a convex program, which are all more tractable and can provide solutions for SLVI(l, u, F), no matter for monotone or non-monotone F.

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THE QUADRATIC FUNCTION

THE QUADRATIC FUNCTION

(b) What type of function can be used to model this situation: linear, exponential or hyperbolic.. (c) Use the graph to estimate the value of the bookcase after: (i) 1.5 years (ii) 8 ye[r]

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An Interpolation Process on Weighted (0,1,2;0)- Interpolation on Laguerre Polynomial

An Interpolation Process on Weighted (0,1,2;0)- Interpolation on Laguerre Polynomial

Pál [6] proved that when the function values are prescribed on one set of n points and derivative values on other set of n-1 points , then there exist no unique polynomial of degree ≤ 2n-2 , but prescribing function value at one more point not belonging to former set of n points there exists a unique polynomial of degree ≤ 2n- 1. . Pál [6] considered an interscaled set of nodes which were the zeros of some polynomial 𝑃(𝑥) and its derivative 𝑃 ′ (𝑥) . The weighted lacunary interpolation was studied and modified by mathematicians such as
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Continuous optimization methods for the quadratic assignment problem

Continuous optimization methods for the quadratic assignment problem

In this research we have developed an algorithm for the QAP based upon several continu- ous optimization techniques. Although the method of relaxation with a penalty function has been proposed earlier in the context of QAP or in the related study of nonlinear 0-1 programming, the pre-conditioning of the Hessian of the objective function in our algorithm is a novel application of such a technique in this context. Using the convex transformation to devise a scheme for an initial point is also unique. Furthermore, the quadratic cut is the first attempt to use a higher order cut in the context of quadratic 0-1 programming with the QAP as a special case. Finally, employing random sampling in the interior of the feasible region for different starting points is an original application of random sampling in the context of the QAP.
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On the Stability of Functional Equations in Random Normed Spaces

On the Stability of Functional Equations in Random Normed Spaces

Let f be a mapping from a linear space X into a complete Random Normed Space Y. In this paper, we prove some results for the stability of Cubic, Quadratic and Jensen-Type Quadratic functional equations in the setting of Random Normed Spaces (RNS).

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On the Takagi interpolation problem

On the Takagi interpolation problem

The authors assume that the reader is familiar with the behavioral approach to systems and control (see [17] for a thorough introduction) and, at least for some detail of the proofs, with quadratic differential forms (for more information on this subject, see [27]). In order to make the paper as self-contained as pos- sible, the basics of exact modeling and the notion of Most Powerful Unfalsified Model (MPUM) are introduced in section 2. The main results of this paper are illustrated in section 3. Finally, in section 4 we discuss some further research topics stemming from the work presented here.
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Study Of Image Interpolation

Study Of Image Interpolation

The relevance of interpolation is also obvious in more advanced visualization contexts, such as volume rendering. There, it is common to apply a texture to the facets that compose the rendered object . Although textures may be given by models (procedural textures), this is generally limited to computer graphics applications; in biomedical rendering, it is preferable to display a texture given by a map consisting of true data samples. Due to the geometric operations involved (e.g., perspective projection), it is necessary to resample this map, and this resampling involves interpolation. In addition, volumetric rendering also requires the computation of gradients, which is best done by taking the interpolation model into account.
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Sparse Grid Interpolation

Sparse Grid Interpolation

grid and on the combined grids have the same behaviour and size. In contrast to that, the absolute error of combined solution with level = 2 shows large errors, see Fig 3.5. The comparison of interpolation error for level = 6 of classical and Clenshaw Curtis sparse grid choice (see Fig 3.4 and Fig 3.7) demonstrates that the approximation generated by Clenshaw Curtis grid are more accurate than that of the classical grid. As we can see, the Clenshaw Curtis process reduces the error equally over the whole domain. With a few terms, these are pretty accurate over the normal range that they are calculated. However, with a finite number of terms the sine function is never exactly equal to a polynomial.
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