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Kenneth Johnson


KJ Innovation

Last seen: environ un mois il y a Actif depuis 2011

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A soumis


Polynomial-to-Pade coefficient conversion
poly2pade converts polynomial coefficients to a Pade approximant's numerator and denominator coefficients.

2 mois il y a | 3 téléchargements |

A soumis


roots_
roots_(c) works with poorly scaled polynomials and does not return zero when c(end) is nonzero.

4 mois il y a | 1 téléchargement |

A soumis


Function pagetensorprod.m, paged tensor product
pagetensorprod generalizes tensorprod for paged operation (analogous to pagemtimes).

4 mois il y a | 1 téléchargement |

A soumis


Class DAA, "Derivative-Augmented Array"
Class DAA, "Derivative-Augmented Array", is a general-purpose automatic differentiation engine implemented in MATLAB.

plus de 2 ans il y a | 1 téléchargement |

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Padé coefficients
Calculate Padé coefficients corresponding to a truncated Taylor series.

plus de 2 ans il y a | 5 téléchargements |

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pageexpm
Paged matrix exponential function

plus de 2 ans il y a | 2 téléchargements |

Réponse apportée
Why does pagemldivide not give Singular Matrix warnings?
Summary of response from Technical Support: The 'help' for 'pagemldivide' states that the function never warns for ill-condit...

presque 3 ans il y a | 0

| A accepté

Question


Why does pagemldivide not give Singular Matrix warnings?
The new pagemldivide function in R2022a Prerelease (I think also in Parallel Computing Toolbox) doesn't give any Singular Matrix...

presque 3 ans il y a | 2 réponses | 1

2

réponses

Question


Why is subscripted assignment so inefficient?
Why is MATLAB's subscripted assignment so abysmally inefficient with more than 2 subscripts? e.g., >> clear, a = []; tic, for j...

presque 3 ans il y a | 1 réponse | 3

1

réponse

A soumis


Generalized matrix operators
The functions mtimes_.m, mldivide_.m, and mrdivide_.m generalize the corresponding MATLAB functions.

presque 3 ans il y a | 1 téléchargement |

Question


MATLAB's inefficient copy-on-write implementation
MATLAB's copy-on-write memory management seems to have a serious defect, which I think is the reason behind the abysmal performa...

presque 3 ans il y a | 2 réponses | 1

2

réponses

A soumis


bsxi
Array indexing for binary singleton expansion

presque 3 ans il y a | 1 téléchargement |

Question


In what way is the new R2021b Editor UI "improved"?
I find the "new and improved" Editor UI in R2021b to be extremely irritating, in no way better than R2021a. How did this get pas...

presque 3 ans il y a | 3 réponses | 11

3

réponses

A soumis


Linear differential equation solver (lde.m)
solves a linear, first-order, vector differential equation

plus de 3 ans il y a | 2 téléchargements |

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Question


Is this a bug in eig?
This issue came up with the roots function (see roots_ on File Exchange), where eig was failing on the companion matrix. Follow...

plus de 3 ans il y a | 1 réponse | 3

1

réponse

A soumis


permn
Generate permutations of 1:n and permutation parity.

presque 4 ans il y a | 2 téléchargements |

A soumis


str2subs, subs2str
Convert a string to/from a subscript struct for use in subsref and subsasgn.

presque 4 ans il y a | 2 téléchargements |

A soumis


fminsearch_(funfcn,x0,options,varargin)
Works around a bug (or design defect) in fminsearch.

plus de 8 ans il y a | 1 téléchargement |

A soumis


serpind.m
serpentine traversal of an N-dimensional array

plus de 8 ans il y a | 2 téléchargements |

A soumis


fgridmin.m
global minimization utility

plus de 8 ans il y a | 1 téléchargement |

A soumis


Generalized Matrix Exponential
Solves Y'(t) = D(t)*Y(t) for Y(1) with Y(0) = I (identity matrix).

plus de 9 ans il y a | 1 téléchargement |

A soumis


Scalar
The Scalar base class disallows non-scalar instantiation.

presque 10 ans il y a | 1 téléchargement |

A soumis


Matrix exponential
Matrix exponential algorithm with improved numerical precision

plus de 10 ans il y a | 2 téléchargements |

A soumis


Matrix polynomial
Efficiently evaluate a polynomial with square-matrix argument and scalar coefficients.

plus de 10 ans il y a | 1 téléchargement |

A soumis


matrix power
more efficient than MATLAB's mpower function

environ 11 ans il y a | 1 téléchargement |

A soumis


elementwise power
more efficient than MATLAB's power function

environ 11 ans il y a | 1 téléchargement |

A soumis


Scanned-Spot-Array EUV Imaging for High-Volume Maskless Lithography
Design data and optical simulation code for maskless EUV lithography system

environ 12 ans il y a | 3 téléchargements |

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A soumis


Cornu Spline
two-point spline with slope constraints

environ 13 ans il y a | 1 téléchargement |

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A soumis


Complex Erf (Error Function), Fresnel Integrals
complex erf function

environ 13 ans il y a | 4 téléchargements |

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