Results 171 to 180 of about 1,510 (211)

Revisiting the hazards of hazard ratios through simulations and case studies. [PDF]

Eur J Epidemiol
Abrahamowicz M, Beauchamp ME, Roberts EK, Taylor JMG.   +3 more
europepmc   +1 more source

Algebraic hyperbolic spline quasi-interpolants and applications

Journal of Computational and Applied Mathematics, 2019
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
S Eddargani, A Lamnii, M Lamnii
exaly   +5 more sources

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An Algebraic Method to Determine If a Point is on a Spline

IEEE Computer Graphics and Applications, 1984
For this task a method that is algebraic in nature should be faster than the usual approximate analytical techniques.
exaly   +2 more sources

Cubic algebraic spline curves design

Applied Mathematics, 2011
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Jiansong Deng, Zhouwang Yang
exaly   +2 more sources

Optimal properties of the uniform algebraic trigonometric B-splines

Computer Aided Geometric Design, 2006
In order to transform spline representations between various bases (which have different advantages), a totally positive matrix transformation is created which transforms Bézier bases into B-spline bases. A convergence result for B-spline curves is also given.
Guozhao Wang, Yajuan Li
openaire   +3 more sources

Least-Squares Fitting of Algebraic Spline Surfaces

Advances in Computational Mathematics, 2002
A new technique is described for fitting implicitly defined algebraic spline surfaces to scattered data in three-dimensional space. By approximating points and associated normal vectors estimated from the scattered data, a computationally simple method is obtained which requires the solution of a sparse system of linear equations.
Bert Jüttler, Alf Felis
openaire   +2 more sources

On algebraic trigonometric integro splines

ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik, 2019
AbstractIn this paper, we present a new kind of quadratic approximation operator reproducing of both algebraic and trigonometric functions. It is called integro quadratic splines interpolant, which agree with the given integral values of a univariate real‐valued function over the same intervals, rather than the functional values at the knots. Efficient
Salah Eddargani, Abdellah Lamnii, Mohamed Lamnii   +2 more
openaire   +3 more sources

B-Spline Pythagorean Hodograph Curves in Clifford Algebras

Advances in Applied Clifford Algebras, 2023
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Bizzarri, Michal, Kadlec, Kryštof, Lávička, Miroslav, Šír, Zbyněk   +3 more
openaire   +4 more sources

2D piecewise algebraic splines for implicit modeling

ACM Transactions on Graphics, 2009
2D splines are a powerful tool for shape modeling, either parametrically or implicitly. However, compared with regular grid-based tensor-product splines, most of the high-dimensional spline techniques based on nonregular 2D polygons, such as box spline and simplex spline, are generally very expensive to evaluate.
Li, Qingde, Tian, Jie
openaire   +2 more sources

A family of tangent continuous cubic algebraic splines

ACM Transactions on Graphics, 1993
Summary: We present an algorithm for creating tangent continuous splines from segments of algebraic cubic curves. The curves used are cubic ovals, and thus are guaranteed convex. Each segment is given by an equation which has five coefficients, thus four degrees of freedom available for shape control.
Marco Paluszny, Richard R. Patterson
openaire   +1 more source