Rank: 2 based on 10192 downloads (last 30 days) and 59 files submitted

John D'Errico

E-mail: woodchips@rochester.rr.com
Company/University: Consultant
Lat/Long: 43.236435, -76.93324

Personal Profile:: Retired from the Eastman Kodak Company, where I was an applied mathematician consulting typically on matters of curve fitting, modeling, and numerical analysis. I enjoy playing bridge, doing woodworking and woodturning, and going for walks. We have a sweet wire hair fox terrier. In my spare time I still like to use Matlab.
Professional Interests:: Numerical analysis, mathematical modeling

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Files Posted by John				View all 1 - 5 of 59
Updated	File	Tags	Downloads (last 30 days)	Comments	Rating
29 Oct 2009	Variable Precision Integer Arithmetic Arithmetic with integers of fully arbitrary size. Arrays and vectors of vpi numbers are supported. Author: John D'Errico	toolbox, projecte, rabin, biginteger, mersenne, data type	191	27	4.66667 4.7 \| 16 ratings
29 Oct 2009	SLM - Shape Language Modeling Least squares spline modeling using shape primitives Author: John D'Errico	shape, modeling, interpolation, spline, splines, slm	333	11	5.0 5.0 \| 10 ratings
23 Jun 2009	insphere Inscribed sphere, entirely inside the facets of a 3-d convex hull Author: John D'Errico	circumsphere, convex hull, computational geometr..., sphere, insphere	108	1	5.0 5.0 \| 1 rating
17 Jun 2009	AB = kBA Solves the homogeneous linear system AB = kBA Author: John D'Errico	homogeneous, linear, riccati, system, linear algebra	153	4	3.0 3.0 \| 2 ratings
17 Jun 2009	incircle.m In-circle of a convex polygon, or of the convex hull of a set of points in two dimensions Author: John D'Errico	computational geometr..., incircle, convex hull, circle, polygon, inscribed circle	129	2	5.0 5.0 \| 2 ratings

Comments and Ratings by John		View all 1 - 5 of 143
Updated	File	Comments	Rating
16 Nov 2009	Polyfitn N-d polynomial regression model Author: John D'Errico	As I explained the first time, you need to put polyfitn into a directory that is on your search path. help addpath help savepath help pathtool Your particular test problem gives me the results: uv = rand(100,2); w = sin(sum(uv,2)); p = polyfitn(uv,w,'u, v'); polyn2sympoly(p) ans = 0.76152u + 0.73572v Nothing special needs be done except putting it in a directory where matlab can find it.
16 Nov 2009	Polyfitn N-d polynomial regression model Author: John D'Errico	If you are trying to place downloaded files into the Matlab/toolbox directories, this is generally wrong. Those directories are cached by matlab when it starts up, so any files that you put in those directories will not be seen until you restart matlab. Also, anytime you make any changes to files that you put in those directories, the changes will not be recognized by matlab. Better is to create your own new (and separate) directory for downloaded files. Add that directory on your search path, using the pathtool function, or using addpath and then savepath.
04 Nov 2009	Counter. Counter. Hours, minutes and seconds. Author: pablo_zuniga Zúñiga	There is no purpose at all in this mess. Nothing at all of value.
04 Nov 2009	Counter. Counter. Hours, minutes and seconds. Author: pablo_zuniga Zúñiga
29 Oct 2009	SLM - Shape Language Modeling Least squares spline modeling using shape primitives Author: John D'Errico	The new version just got uploaded to repair the 'active-set' problems incurred with the newer optimization toolbox releases.

Comments and Ratings on John's Files			View all 1 - 5 of 525
Updated	File	Comment by	Comments	Rating
21 Nov 2009	SLM - Shape Language Modeling Least squares spline modeling using shape primitives Author: John D'Errico	Cheng, Raymond	Thanks for your sharing.
16 Nov 2009	Polyfitn N-d polynomial regression model Author: John D'Errico	D'Errico, John	As I explained the first time, you need to put polyfitn into a directory that is on your search path. help addpath help savepath help pathtool Your particular test problem gives me the results: uv = rand(100,2); w = sin(sum(uv,2)); p = polyfitn(uv,w,'u, v'); polyn2sympoly(p) ans = 0.76152u + 0.73572v Nothing special needs be done except putting it in a directory where matlab can find it.
16 Nov 2009	Polyfitn N-d polynomial regression model Author: John D'Errico	alex, Alexandros	So if I want to run this script uv = rand(100,2); w = sin(sum(uv,2)); p = polyfitn(uv,w,'u, v'); if exist('sympoly') == 2 polyn2sympoly(p) end if exist('sym') == 2 polyn2sym(p) end do I have to "call" the script "polyfitn" with a specific command? Generaly what should I do in order to run the above script while polyfitn is a custom script of a user?
16 Nov 2009	Polyfitn N-d polynomial regression model Author: John D'Errico	D'Errico, John	If you are trying to place downloaded files into the Matlab/toolbox directories, this is generally wrong. Those directories are cached by matlab when it starts up, so any files that you put in those directories will not be seen until you restart matlab. Also, anytime you make any changes to files that you put in those directories, the changes will not be recognized by matlab. Better is to create your own new (and separate) directory for downloaded files. Add that directory on your search path, using the pathtool function, or using addpath and then savepath.
15 Nov 2009	Polyfitn N-d polynomial regression model Author: John D'Errico	alex, Alexandros	The function polyfitn will probably help me but I don't know how to install this function. I downloaded the file and I pasted it in the toolbox subfolder of Program files/Matlab.... However when I run this uv = rand(100,2); w = sin(sum(uv,2)); p = polyfitn(uv,w,'u, v'); if exist('sympoly') == 2 polyn2sympoly(p) end if exist('sym') == 2 polyn2sym(p) end it returns ??? Undefined function or method 'polyfitn' for input arguments of type 'double'. Error in ==> testxk at 3 p = polyfitn(uv,w,'u, v'); What's wrong?

Top Tags Applied by John	1 - 5 of 260
approximation, interpolation, computational geometry, matrices, minimum

Files Tagged by John				View all 1 - 5 of 61
Updated	File	Tags	Downloads (last 30 days)	Comments	Rating
29 Oct 2009	Variable Precision Integer Arithmetic Arithmetic with integers of fully arbitrary size. Arrays and vectors of vpi numbers are supported. Author: John D'Errico	toolbox, projecte, rabin, biginteger, mersenne, data type	191	27	4.66667 4.7 \| 16 ratings
29 Oct 2009	SLM - Shape Language Modeling Least squares spline modeling using shape primitives Author: John D'Errico	shape, modeling, interpolation, spline, splines, slm	333	11	5.0 5.0 \| 10 ratings
23 Jun 2009	insphere Inscribed sphere, entirely inside the facets of a 3-d convex hull Author: John D'Errico	circumsphere, convex hull, computational geometr..., sphere, insphere	108	1	5.0 5.0 \| 1 rating
17 Jun 2009	AB = kBA Solves the homogeneous linear system AB = kBA Author: John D'Errico	homogeneous, linear, riccati, system, linear algebra	153	4	3.0 3.0 \| 2 ratings
17 Jun 2009	incircle.m In-circle of a convex polygon, or of the convex hull of a set of points in two dimensions Author: John D'Errico	computational geometr..., incircle, convex hull, circle, polygon, inscribed circle	129	2	5.0 5.0 \| 2 ratings

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