Search Comments and Ratings
Comments and Ratings
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| Date | File | Comment by | Comment | Rating |
| 07 Nov 2009 | find_components finds the connected components of an image | Clark, Thomas | Thanks Tim! This is very popular in the current ML contest (flooding a matrix with colour, Fall 2009). |
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| 15 Oct 2009 | A pretty seashell GUI A GUI that draws a pretty seashell | Diego | ||
| 27 Sep 2009 | Don't let that INV go past your eyes; to solve that system, FACTORIZE! A simple-to-use object-oriented method for solving linear systems and least-squares problems. | Luong, Bruno | What mathworks are waiting to incorporate this package into Matlab? |
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| 05 Aug 2009 | Don't let that INV go past your eyes; to solve that system, FACTORIZE! A simple-to-use object-oriented method for solving linear systems and least-squares problems. | Ben | All in all this package is a great idea and it looks like a first class implementation. As such, I'd like to help improve it by pointing out an issue. I am trying to solve Ax=-b, so I type in x=-inverse(A)*b, but I get the following error: ??? Undefined function or method 'uminus' for input arguments of type 'factorization_dense_lu'. The work around is simple: x=inverse(A)*(-b). However, these are mathematically equivalent, so both should work. |
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| 19 Jun 2009 | Don't let that INV go past your eyes; to solve that system, FACTORIZE! A simple-to-use object-oriented method for solving linear systems and least-squares problems. | LI, Miao | ||
| 05 Jun 2009 | Don't let that INV go past your eyes; to solve that system, FACTORIZE! A simple-to-use object-oriented method for solving linear systems and least-squares problems. | Petter | Nice with an update to modern MATLAB OOP. |
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| 27 May 2009 | Don't let that INV go past your eyes; to solve that system, FACTORIZE! A simple-to-use object-oriented method for solving linear systems and least-squares problems. | Petter | This is an excellent piece of software. Makes great use of Matlab's OOP. |
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| 18 May 2009 | Don't let that INV go past your eyes; to solve that system, FACTORIZE! A simple-to-use object-oriented method for solving linear systems and least-squares problems. | Paris, Sebastien | Great !!! |
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| 15 May 2009 | Don't let that INV go past your eyes; to solve that system, FACTORIZE! A simple-to-use object-oriented method for solving linear systems and least-squares problems. | D'Errico, John | Absolutely splendid! Many thanks to Tim for writing this. A great title too. |
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| 15 May 2009 | Don't let that INV go past your eyes; to solve that system, FACTORIZE! A simple-to-use object-oriented method for solving linear systems and least-squares problems. | us | a truly professional and INValuable package written with a twinkle in the (author's) eye and a must look-at for people dealing with linear systems...
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| 18 Feb 2009 | find_components finds the connected components of an image | Petschel, Ben | Nice code Tim. I hadn't come across DMPERM before either. The variables K, East, South aren't really needed because K(E)=E, K(S)=S, East(E)=E+m, South(S)=S+1, and E & S can be defined without K. |
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| 01 Dec 2008 | spok: checks if a MATLAB sparse matrix is OK Useful for mexFunction authors only | HAN, Qun | Great work. But the submmited file is in c. I want to know if a MATLAB sparse matrix is passed into a FORTRAN mex file how to indexing it? |
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| 30 Oct 2008 | find_components finds the connected components of an image | Eaton, Kenneth | I hadn't ever happened upon DMPERM before. Thanks for pointing out something new, Tim. |
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| 30 Oct 2008 | find_components finds the connected components of an image | D'Errico, John | Professionally written. Excellent help. Internal comments that can teach everyone on the FEX something about how to write code. |
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| 30 Oct 2008 | find_components finds the connected components of an image | P, M | ||
| 19 Sep 2008 | Gaussian Elimination Example (with partial pivoting): GEE, it's simple! A set of simple functions that illustrate Gaussian Elimination with partial pivoting | Toljic, Nikola | Great. Thanks. |
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| 04 Jun 2008 | LINFACTOR: uses LU or CHOL to factorize a matrix, or previously computed factors to solve Ax=b A simple M-file to solve Ax=b using LU or CHOL. | Fasih, Ahmed | Note that this works when 'b' is a matrix as well! Works like a charm for Slepian-Bangs formulation for the Cramer-Rao bound! |
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| 07 Feb 2008 | LINFACTOR: uses LU or CHOL to factorize a matrix, or previously computed factors to solve Ax=b A simple M-file to solve Ax=b using LU or CHOL. | Akbar, Shamil |
>> F=linfactor(a)
Error in ==> linfactor at 118
HELP ME,,,,,, I WANT TO USE CHOLESKY TO FACTORIZE MY CORELATION MATRIX |
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| 17 Dec 2007 | gipper: zip selected files, or exclude selected files Creates a zip file, using regexp to include and/or exclude filenames that match a list of patterns | McGowan, John | ||
| 15 Dec 2007 | A pretty seashell a short MATLAB function that displays a pretty seashell | Cole, Lamar | Just as the sound of the sea flows through a seashell, the sound of love flows through the heart. |
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| 11 Dec 2007 | Gaussian Elimination Example (with partial pivoting): GEE, it's simple! A set of simple functions that illustrate Gaussian Elimination with partial pivoting | D'Errico, John | As you might expect, this is good code. For a student, you should be able to read through this to see how a well written method for matrix factorization/solution is composed. One of the things that you would learn from this submission is to use the capabilities of matlab to vectorize your computations. Look in these codes to find that row operations are done in single operations, not using heavily nested loops. The loops are still there of course, but they are implicit loops, and so will be more efficiently executed by matlab. Its easier to read code like this too. Next, look in gee_its_simple_factorize to see the useful comments before each line. These comments explain what is done in the next step, clearly and readably. They allow you to visualize what is happening, how this code works. And next year, when you need to modify/repair a nasty piece of your own code, you will be very glad that you added comments like this. Other things to emulate from this code are the copious references. Did I mention LOTS of comments? Help and comments are cheap, but at the same time, priceless. In general, this is well worth reading. I'll bet that many people will learn something new here, even if you think you already know what an LU factorization is and how to use it. (I picked up something myself.) Of course, if you only want code to use, then the built in \, lu, etc., are the places to look. |
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| 23 Aug 2007 | hprintf: disable hypertext highlighting hprintf is just like fprintf, except that hypertext links are not highlighted in the command window | Kearney, Kelly | Very nice little function, exactly what I was looking for in my comments on Kristin's blog. Thanks. |
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| 21 May 2007 | gipper: zip selected files, or exclude selected files Creates a zip file, using regexp to include and/or exclude filenames that match a list of patterns | Davis, Tim | Regarding the inscrutable error mentioned below. This is because the directory containing gipper.m was not in your MATLAB path. It was simply not found by MATLAB. The gipper cd's to the parent if it needs to create a zip file of the current directory (if it didn't, the zip file would contain odd paths in its contents). After doing "cd ..", it calls itself recursively ... but if the directory containing gipper.m is not in your path, this fails. I added a test for this, and an error "To install the gipper, type 'pathtool' and add the directory in which it resides." |
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| 16 May 2007 | gipper: zip selected files, or exclude selected files Creates a zip file, using regexp to include and/or exclude filenames that match a list of patterns | (us) Schwarz, Urs | tim, several of your examples (when copy/pasted into the command window of a winvista/r2007a) yield an inscrutable error, eg,
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| 16 May 2007 | gipper: zip selected files, or exclude selected files Creates a zip file, using regexp to include and/or exclude filenames that match a list of patterns | D'Errico, John | The gipper is a must have, absolutely so if you have a Mac and you upload .zip files to the FEX. It automatically excludes any hidden files from the zip. My thanks to Tim for writing this. |
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| 20 Nov 2006 | A pretty seashell a short MATLAB function that displays a pretty seashell | beach, shelly | beautiful seashell
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| 20 Sep 2006 | Slides for the video "Direct Methods for Sparse Linear Systems : the MATLAB sparse backslash" Slides for a plenary talk at the 2006 SIAM Annual Meeting | suliman, Tamir | good and thanks for that but needs to add more detail and examples |
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| 24 Aug 2006 | A pretty seashell a short MATLAB function that displays a pretty seashell | Boaron, Marco | ||
| 29 Jul 2006 | A pretty seashell a short MATLAB function that displays a pretty seashell | Davis, Tim | Author's comments: for an explanation of the a, b, c, and n parameters, see "shellgui", also in the MATLAB Central Gallery. |
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| 20 Jul 2006 | A pretty seashell a short MATLAB function that displays a pretty seashell | Koptenko, Sergei | An interesting and beautiful illustration. It would be nice to include some explanation of what exactly parameters n, a, b and c are controling. |
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| 20 Jul 2006 | A pretty seashell a short MATLAB function that displays a pretty seashell | Keats, Brian | Cool. |
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