John D'Errico
Retired
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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1 of your answers has been picked for excellence by MATLAB Answers Editors
Awarded to John D'Errico on 17 Mar 2023
Answer 50 questions that were unanswered for more than 30 days
Awarded to John D'Errico on 15 Nov 2020
Obtain 50 solvers for a problem you have created
Awarded to John D'Errico on 10 Sep 2020
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Top ten contributors with the most downloaded submissions in 2022
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Top ten contributors with the most downloaded submissions in 2021
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Content Feed
Inviato
randpoly
Generate N uniformly distributed points inside a supplied polygon (or polyshape)
3 mesi fa | 1 download |
Inviato
allcrossings
Locate all intersections of a pair of functions f1 and f2, on a finite domain
3 mesi fa | 0 download |
Inviato
A limited set of basic number theoretic tools
Various tools for working with integers and their factors, primes, congruences, etc.
5 mesi fa | 2 download |
Inviato
minkowskiSum
Compute the Minkowski sum of any two polygons or polyshapes, convex or concave.
6 mesi fa | 8 download |
Inviato
randFixedLinearCombination
Uniform random samples over a n-dimensional hyper-rectangle, subject to a linear equality constraint
oltre 2 anni fa | 5 download |
Inviato
Eigenshuffle
Consistently sorted eigenvalue and eigenvector sequences
quasi 3 anni fa | 32 download |
Inviato
Divisors of a number, perfect, amicable, and sociable number
Tools to work (and play) with the divisors of a number
oltre 4 anni fa | 1 download |
Inviato
HPF - a big decimal class
High precision floating point arithmetic, a new class written in MATLAB
circa 5 anni fa | 48 download |
Inviato
The permanent of any matrix (square or not)
The permanent of any matrix, square or not
quasi 6 anni fa | 1 download |
Inviato
SLM - Shape Language Modeling
Least squares spline modeling using shape primitives
circa 6 anni fa | 74 download |
Inviato
The Fibonacci Sequence
Efficient computation of Fibonacci and Lucas numbers
oltre 6 anni fa | 6 download |
Inviato
base2base(Nstart,bstart,bend)
Numeric base conversion between any two numeric bases, for any size integer.
quasi 7 anni fa | 3 download |
Inviato
Optimization Tips and Tricks
Tips and tricks for use of the optimization toolbox, linear and nonlinear regression.
circa 7 anni fa | 15 download |
Inviato
movingstd & movingstd2
A (fast) windowed std on a time series (or array)
circa 7 anni fa | 1 download |
Inviato
Surface Fitting using gridfit
Model 2-d surfaces from scattered data
oltre 7 anni fa | 97 download |
Inviato
Batched partitioned nonlinear least squares
Speed up when you have a very large number of nonlinear least squares problems, but with one model
circa 8 anni fa | 2 download |
Inviato
export_search_path
Allows the user to transfer your search path from an old MATLAB release to a new release
circa 8 anni fa | 1 download |
Inviato
Adaptive numerical limit (and residue) estimation
Numerical extrapolation of a limit (with an error estimate) from only function values
circa 8 anni fa | 1 download |
Inviato
Variable Precision Integer Arithmetic
Arithmetic with integers of fully arbitrary size. Arrays and vectors of vpi numbers are supported.
oltre 8 anni fa | 45 download |
Inviato
Symbolic Polynomial Manipulation
Symbolic polynomial manipulation as an exercise in OOP
oltre 8 anni fa | 29 download |
Inviato
Adaptive Robust Numerical Differentiation
Numerical derivative of an analytically supplied function, also gradient, Jacobian & Hessian
oltre 8 anni fa | 56 download |
Inviato
A suite of minimal bounding objects
Suite of tools to compute minimal bounding circles, rectangles, triangles, spheres, incircles, etc.
circa 9 anni fa | 54 download |
Inviato
distance2curve
Find the closest point on a (n-dimensional) curve to any given point or set of points
oltre 10 anni fa | 28 download |
Inviato
Inverse (integrated) gradient
Vectorized & fully sparse 1-d, 2-d, & 3-d integrated gradients
oltre 10 anni fa | 12 download |
Inviato
Inhull
Efficient test for points inside a convex hull in n dimensions
oltre 10 anni fa | 26 download |
Inviato
interparc
Distance based interpolation along a general curve in space
quasi 11 anni fa | 72 download |
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