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John D'Errico


Retired

Last seen: Today Active since 2006

A retired applied mathematician, consultant, sometime mechanical engineer, numerical analyst, woodworker, bridge player. Please DON'T contact me, as too many students then decide I am their personal consultant if I allow it. I won't do consulting by mail.

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Content Feed

Submitted


randpoly
Generate N uniformly distributed points inside a supplied polygon (or polyshape)

1 year ago | 1 download |

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allcrossings
Locate all intersections of a pair of functions f1 and f2, on a finite domain

1 year ago | 1 download |

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num2bin
Expression of all numbers in a variety of binary forms.

1 year ago | 1 download |

Submitted


A limited set of basic number theoretic tools
Various tools for working with integers and their factors, primes, congruences, etc.

1 year ago | 2 downloads |

Submitted


minkowskiSum
Compute the Minkowski sum of any two polygons or polyshapes, convex or concave.

1 year ago | 8 downloads |

Submitted


randFixedLinearCombination
Uniform random samples over a n-dimensional hyper-rectangle, subject to a linear equality constraint

3 years ago | 2 downloads |

Submitted


Eigenshuffle
Consistently sorted eigenvalue and eigenvector sequences

4 years ago | 46 downloads |

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Divisors of a number, perfect, amicable, and sociable number
Tools to work (and play) with the divisors of a number

5 years ago | 1 download |

Submitted


HPF - a big decimal class
High precision floating point arithmetic, a new class written in MATLAB

6 years ago | 77 downloads |

Submitted


Partitions of an integer
List all partitions of an integer

6 years ago | 6 downloads |

Submitted


The permanent of any matrix (square or not)
The permanent of any matrix, square or not

7 years ago | 1 download |

Submitted


SLM - Shape Language Modeling
Least squares spline modeling using shape primitives

7 years ago | 74 downloads |

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Submitted


The Fibonacci Sequence
Efficient computation of Fibonacci and Lucas numbers

7 years ago | 4 downloads |

Submitted


base2base(Nstart,bstart,bend)
Numeric base conversion between any two numeric bases, for any size integer.

7 years ago | 3 downloads |

Submitted


polyfitn
Polynomial modeling in 1 or n dimensions

8 years ago | 214 downloads |

Submitted


Optimization Tips and Tricks
Tips and tricks for use of the optimization toolbox, linear and nonlinear regression.

8 years ago | 19 downloads |

Submitted


movingstd & movingstd2
A (fast) windowed std on a time series (or array)

8 years ago | 5 downloads |

Submitted


Surface Fitting using gridfit
Model 2-d surfaces from scattered data

8 years ago | 90 downloads |

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Batched partitioned nonlinear least squares
Speed up when you have a very large number of nonlinear least squares problems, but with one model

9 years ago | 3 downloads |

Submitted


export_search_path
Allows the user to transfer your search path from an old MATLAB release to a new release

9 years ago | 1 download |

Submitted


Adaptive numerical limit (and residue) estimation
Numerical extrapolation of a limit (with an error estimate) from only function values

9 years ago | 10 downloads |

Submitted


Variable Precision Integer Arithmetic
Arithmetic with integers of fully arbitrary size. Arrays and vectors of vpi numbers are supported.

9 years ago | 58 downloads |

Submitted


Symbolic Polynomial Manipulation
Symbolic polynomial manipulation as an exercise in OOP

9 years ago | 31 downloads |

Submitted


Adaptive Robust Numerical Differentiation
Numerical derivative of an analytically supplied function, also gradient, Jacobian & Hessian

9 years ago | 38 downloads |

Submitted


A suite of minimal bounding objects
Suite of tools to compute minimal bounding circles, rectangles, triangles, spheres, incircles, etc.

10 years ago | 48 downloads |

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nearestSPD
Finding the nearest positive definite matrix

10 years ago | 37 downloads |

Submitted


distance2curve
Find the closest point on a (n-dimensional) curve to any given point or set of points

11 years ago | 29 downloads |

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Inverse (integrated) gradient
Vectorized & fully sparse 1-d, 2-d, & 3-d integrated gradients

11 years ago | 14 downloads |

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Inhull
Efficient test for points inside a convex hull in n dimensions

11 years ago | 30 downloads |

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interparc
Distance based interpolation along a general curve in space

11 years ago | 75 downloads |

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