Rank: 100 based on 1734 downloads (last 30 days) and 13 files submitted
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Ben Petschel

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Files Posted by Ben View all
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24 Sep 2009 jointable Join pairs of tables using arbitrary keys Author: Ben Petschel join, jointable, sql 102 0
14 Sep 2009 multisetdiff like setdiff, but any repeated elements of A are removed only once for each time they occur in B Author: Ben Petschel setdiff, multiset, multisetdiff 133 2
14 Sep 2009 lexcmp Fast C-style array/string comparison (by lexical ordering) Author: Ben Petschel comparison, compare, lexical, string comparison, string 132 0
31 Aug 2009 Published M-Files Pointers Toolbox basic functions to work with pointer variables and dynamic data types Author: Ben Petschel pointer object, dynamic data type, virtual memory, pointer 125 0
  • 4.0
4.0 | 1 rating
28 Aug 2009 stack manipulate stack objects as dynamic arrays Author: Ben Petschel dynamic array, use at own risk, stack 98 0
Comments and Ratings by Ben View all
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21 Sep 2009 All Permutations of integers with sum criteria All Pernutations of integers with sum criteria Author: Bruno Luong

Nice program. Users might also be interested in a looped solution using the function "nextwhile" in the NextVector toolbox <pre class="link">http://www.mathworks.com/matlabcentral/fileexchange/24757&lt;/pre&gt;. If the entire matrix of combinations is needed then Bruno's version is faster (because row concatenation is slow) otherwise the looped solution is faster.
16 Sep 2009 Blendenpik A fast solver of dense rectangular dense linear equations . (least squares or underdetermined). Author: Haim Avron

Nice work
14 Sep 2009 Blendenpik A fast solver of dense rectangular dense linear equations . (least squares or underdetermined). Author: Haim Avron

This is potentially a novel and useful algorithm but I couldn't get it to install because it seems to require a separate installation of FFTW C libraries, even though FFTW already comes with MATLAB and is used by the built-in version of FFT.

Also there is no mention of how the results compare in accuracy and speed against the built-in solves least-squares "\", so why go to the trouble of getting it to work?

11 Sep 2009 Blendenpik A fast solver of dense rectangular dense linear equations . (least squares or underdetermined). Author: Haim Avron

Can you post the results of benchmarking against "\" please?
03 Sep 2009 setdiff Set difference of two sets of positive integers (much faster than built-in setdiff) Author: Nick

Neat idea. How does the speed compare when you use sparse and/or logical arrays, e.g. to do setdiff([1,1e9],1) ?
Comments and Ratings on Ben's Files View all
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10 Sep 2009 multisetdiff like setdiff, but any repeated elements of A are removed only once for each time they occur in B Author: Ben Petschel Jos

Please ignore my previous thought as it is incorrect !!

10 Sep 2009 multisetdiff like setdiff, but any repeated elements of A are removed only once for each time they occur in B Author: Ben Petschel Jos

Nice utility! Just a thought, for numerical vectors, this might be more convenient:

C = union(A,B) ;
res = C(histc(A,C) > histc(B,C))

To deal with rows of matrices or cell array strings, one could convert A and B into indices using, e.g., the third output of unique.
01 Sep 2009 Pointers Toolbox basic functions to work with pointer variables and dynamic data types Author: Ben Petschel Philip

18 Aug 2009 Fractions Toolbox create and manipulate fractions (K+N/D) using exact arithmetic Author: Ben Petschel Bizkevelci, Erdal

01 Aug 2009 Fractions Toolbox create and manipulate fractions (K+N/D) using exact arithmetic Author: Ben Petschel Fig, Matt

Great work!
Top Tags Applied by Ben
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sql, arithmetic, chebyshevmarkovstieltjes, combination, combinations
Files Tagged by Ben View all
  • 1 - 5 of
  • 14
Updated   File Tags Downloads
(last 30 days) 		Comments Rating
24 Sep 2009 jointable Join pairs of tables using arbitrary keys Author: Ben Petschel join, jointable, sql 102 0
14 Sep 2009 multisetdiff like setdiff, but any repeated elements of A are removed only once for each time they occur in B Author: Ben Petschel setdiff, multiset, multisetdiff 133 2
14 Sep 2009 lexcmp Fast C-style array/string comparison (by lexical ordering) Author: Ben Petschel comparison, compare, lexical, string comparison, string 132 0
31 Aug 2009 Published M-Files Pointers Toolbox basic functions to work with pointer variables and dynamic data types Author: Ben Petschel pointer object, dynamic data type, virtual memory, pointer 125 0
  • 4.0
4.0 | 1 rating
28 Aug 2009 stack manipulate stack objects as dynamic arrays Author: Ben Petschel dynamic array, use at own risk, stack 98 0
 

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