5.0 | 1 rating Rate this file 273 downloads (last 30 days) File Size: 7.25 KB File ID: #23005

bsxfun substitute

17 Feb 2009

Substitute for bsxfun for older versions of MATLAB in which it is not built-in.

File Information
Description	This m-file and accompanying mex functions replicate the functionality of bsxfun for use in older versions of MATLAB prior to R2007a -- the first version that came with bsxfun built-in. This code retains the important feature of not replicating any large arrays in order to perform its function. Included is the source code for a series of mex functions that implement this functionality for several basic operators: plus, minus, times, etc. The function will work without these present albeit more slowly.
Acknowledgements	The author wishes to acknowledge the following in the creation of this submission: Generalized Array Operations
MATLAB release	MATLAB 7.0.4 (R14SP2)
Other requirements	Tested on Mac OS X and Windows XP.
Zip File Content
Other Files	bsx_mex.c, bsxfun.m, make_bsx_mex.m, readme.txt

Tags for This File
Everyone's Tags	algebraic operation, arithmetic operation, array, array expansion(2), array replication, atan2, bsxfun(2), elementwise operation, eq, expansion, ge, gt, ldivide, le, lt, matrix expansion, minus, multidimensional array, multiplication, ne, plus, power, product, rdivide, relational operation, replication, singleton(2), singleton expansion, times, vector expansion, virtual expansion, virtual replication
Tags I've Applied
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Comments and Ratings (3)
18 Feb 2009	Wolfgang Schwanghart	Hi Doug, I didn't test your submission, since I have a version of Matlab, that includes bsxfun. Yet, it came to my mind that there was a previous submission for the same purpose. http://www.mathworks.com/matlabcentral/fileexchange/18685 Best regards, Wolfgang
18 Feb 2009	Douglas Schwarz	Hi Wolfgang, Yes, I am aware of that submission. It differs from mine in that it uses extra memory by expanding the input arrays until they are the same size. My submission will never do that (and might be slower as a result). Doug
28 Feb 2009	Paolo de Leva	An excellent "hack". A smart, fast and computationally efficient replacement for BSXFUN which allowed me to ensure backward compatibility for the latest version of the ARRAYLAB toolbox: http://www.mathworks.fr/matlabcentral/fileexchange/8773 http://www.mathworks.fr/matlabcentral/fileexchange/8782 http://www.mathworks.fr/matlabcentral/fileexchange/23084 Two other functions, available on MATLAB Central File Exchange, do approximately the same job as Doug's submission: http://www.mathworks.com/matlabcentral/fileexchange/10333 http://www.mathworks.com/matlabcentral/fileexchange/18685 They both do it less efficiently as for memory usage, by temporarily allocating a significant amount of additional memory to expand the input arrays. As for the first one (GENOP), it is also slower than this one. On behalf of all the users of pre-R2007a MATLAB releases, thank you very much Doug.

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Tag Activity for this File
Tag	Applied By	Date/Time
bsxfun	Douglas Schwarz	17 Feb 2009 17:44:12
array expansion	Douglas Schwarz	17 Feb 2009 17:44:12
singleton	Douglas Schwarz	17 Feb 2009 17:44:12
singleton expansion	Paolo de Leva	28 Feb 2009 07:28:16
virtual expansion	Paolo de Leva	28 Feb 2009 07:28:17
virtual replication	Paolo de Leva	28 Feb 2009 07:28:17
array replication	Paolo de Leva	28 Feb 2009 07:28:17
replication	Paolo de Leva	28 Feb 2009 07:29:28
expansion	Paolo de Leva	28 Feb 2009 07:29:28
elementwise operation	Paolo de Leva	28 Feb 2009 07:29:28
algebraic operation	Paolo de Leva	28 Feb 2009 07:29:28
relational operation	Paolo de Leva	28 Feb 2009 07:29:28
eq	Paolo de Leva	28 Feb 2009 07:39:09
array	Paolo de Leva	28 Feb 2009 07:39:09
atan2	Paolo de Leva	28 Feb 2009 07:39:09
bsxfun	Paolo de Leva	28 Feb 2009 07:39:09
arithmetic operation	Paolo de Leva	28 Feb 2009 07:39:09
vector expansion	Paolo de Leva	28 Feb 2009 07:39:09
gt	Paolo de Leva	28 Feb 2009 07:39:09
ldivide	Paolo de Leva	28 Feb 2009 07:39:09
le	Paolo de Leva	28 Feb 2009 07:39:09
lt	Paolo de Leva	28 Feb 2009 07:39:09
matrix expansion	Paolo de Leva	28 Feb 2009 07:39:09
minus	Paolo de Leva	28 Feb 2009 07:39:09
multidimensional array	Paolo de Leva	28 Feb 2009 07:39:09
multiplication	Paolo de Leva	28 Feb 2009 07:39:09
ne	Paolo de Leva	28 Feb 2009 07:39:09
plus	Paolo de Leva	28 Feb 2009 07:39:09
power	Paolo de Leva	28 Feb 2009 07:39:09
product	Paolo de Leva	28 Feb 2009 07:39:09
rdivide	Paolo de Leva	28 Feb 2009 07:39:09
times	Paolo de Leva	28 Feb 2009 07:39:09
ge	Paolo de Leva	28 Feb 2009 07:39:09
array expansion	Paolo de Leva	28 Feb 2009 07:40:02
singleton	Paolo de Leva	28 Feb 2009 07:40:05

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