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Kenneth Johnson


KJ Innovation

Last seen: 8 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.

ungefär ett år ago | 1 download |

Submitted


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

ungefär ett år ago | 1 download |

Submitted


pageexpm
Paged matrix exponential function

mer än ett år ago | 2 downloads |

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...

mer än ett år 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...

mer än ett år 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...

mer än ett år ago | 1 answer | 3

1

answer

Submitted


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

mer än ett år 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...

mer än ett år ago | 2 answers | 1

2

answers

Submitted


bsxi
Array indexing for binary singleton expansion

mer än 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...

mer än ett år ago | 3 answers | 11

3

answers

Submitted


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

mer än 2 år ago | 2 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...

mer än 2 år ago | 1 answer | 3

1

answer

Submitted


permn
Generate permutations of 1:n and permutation parity.

mer än 2 år ago | 2 downloads |

Submitted


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

nästan 3 år ago | 1 download |

Submitted


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

nästan 3 år ago | 3 downloads |

Submitted


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

mer än 7 år ago | 2 downloads |

Submitted


serpind.m
serpentine traversal of an N-dimensional array

mer än 7 år ago | 1 download |

Submitted


fgridmin.m
global minimization utility

mer än 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 8 år ago | 1 download |

Submitted


Scalar
The Scalar base class disallows non-scalar instantiation.

mer än 8 år ago | 1 download |

Submitted


Matrix exponential
Matrix exponential algorithm with improved numerical precision

mer än 9 år ago | 2 downloads |

Submitted


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

mer än 9 år ago | 1 download |

Submitted


matrix power
more efficient than MATLAB's mpower function

nästan 10 år ago | 1 download |

Submitted


elementwise power
more efficient than MATLAB's power function

nästan 10 år ago | 2 downloads |

Submitted


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

nästan 11 år ago | 3 downloads |

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Submitted


Cornu Spline
two-point spline with slope constraints

nästan 12 år ago | 2 downloads |

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Submitted


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

nästan 12 år ago | 5 downloads |

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