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Kenneth Johnson


KJ Innovation

Last seen: 4 månader ago Active since 2011

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Submitted


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

6 månader ago | 3 downloads |

Submitted


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

7 månader ago | 2 downloads |

Submitted


pageexpm
Paged matrix exponential function

11 månader ago | 1 download |

Answered
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...

11 månader ago | 0

| accepted

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...

11 månader ago | 2 answers | 1

2

answers

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...

12 månader ago | 1 answer | 3

1

answer

Submitted


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

12 månader ago | 1 download |

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...

12 månader ago | 2 answers | 1

2

answers

Submitted


bsxi
Array indexing for binary singleton expansion

ungefär ett år ago | 1 download |

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...

ungefär ett år ago | 0 answers | 11

0

answers

Submitted


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

mer än ett år ago | 4 downloads |

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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...

nästan 2 år ago | 1 answer | 3

1

answer

Submitted


permn
Generate permutations of 1:n and permutation parity.

nästan 2 år ago | 3 downloads |

Submitted


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

ungefär 2 år ago | 1 download |

Submitted


roots_
roots_(c) does not return zero when c(end) is nonzero.

ungefär 2 år ago | 3 downloads |

Submitted


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

mer än 6 år ago | 2 downloads |

Submitted


serpind.m
serpentine traversal of an N-dimensional array

nästan 7 år ago | 1 download |

Submitted


fgridmin.m
global minimization utility

nästan 7 år ago | 1 download |

Submitted


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

mer än 7 år ago | 1 download |

Submitted


Scalar
The Scalar base class disallows non-scalar instantiation.

nästan 8 år ago | 1 download |

Submitted


Matrix exponential
Matrix exponential algorithm with improved numerical precision

nästan 9 år ago | 1 download |

Submitted


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

nästan 9 år ago | 1 download |

Submitted


matrix power
more efficient than MATLAB's mpower function

ungefär 9 år ago | 1 download |

Submitted


elementwise power
more efficient than MATLAB's power function

ungefär 9 år ago | 1 download |

Submitted


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

mer än 10 år ago | 1 download |

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Submitted


Cornu Spline
two-point spline with slope constraints

ungefär 11 år ago | 1 download |

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Submitted


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

ungefär 11 år ago | 3 downloads |

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