Rank: 351 based on 328 downloads (last 30 days) and 8 files submitted
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Angshul Majumdar

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Company/University
University of British Columbia

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Professional Interests:
Signal and Image Processing, Computer Vision, Machine Learning

 

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Files Posted by Angshul View all
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11 Aug 2009 Non Convex Algorithms for Group Sparse Optimization Reweighted Lm,p algorithm Smoothed L2,0 algorithm Author: Angshul Majumdar communications, modeling, nonconvex, simulation, matrix, optimization 50 1
04 Aug 2009 Non Convex Compressed Sensing for Non Gaussian Noise optimization of the form min ||x||_p subject to ||y-Ax||_q<e Author: Angshul Majumdar simulation, optimization, earth science, mathematics, image processing, signal processing 53 4
07 Jun 2009 Compressive Classifier Classifiers Robust to Dimensionality Reduction via Random Projections Author: Angshul Majumdar simulation, optimization, classification, image processing, signal processing 30 0
24 Mar 2009 Greedy Algorithms promoting Group Sparsity V3 Approximate Greedy Solutions to the problem min||x(k)||_2,0 such that Ax = b Author: Angshul Majumdar modeling, optimization, earth science, system identification, image processing, signal processing 26 0
30 Jan 2009 Greedy Algorithms promoting Group Sparsity V2 Approximate Greedy Solutions to the problem min||x(k)||_2,0 such that Ax = b Author: Angshul Majumdar interpolation, simulation, compressive sampling, group sparsity, optimization, earth science 41 0
Comments and Ratings by Angshul View all
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08 Sep 2009 Non Convex Compressed Sensing for Non Gaussian Noise optimization of the form min ||x||_p subject to ||y-Ax||_q<e Author: Angshul Majumdar

itecheck has something to do with the version of Matlab you are using. U can search the iterchk function online from google and add it to your Matlab Path.
06 Apr 2009 Complex step Jacobian Calculate Jacobian using complex step differentiation Author: Yi Cao

the step size 'eps' is not specified? Do U suggest a value?
20 Feb 2009 FLD-based Face Recognition System This package implements 'Fisherface', a FLD-based face recognition system. Author: Amir Hossein Omidvarnia

Works well for the toy example provided. Should have been more general.
29 Jan 2009 Greedy Algorithms promoting Group Sparsity Approximate Greedy Solutions to the problem min||x(k)||_2,0 such that Ax = b Author: Angshul Majumdar

29 Jan 2009 Orthogonal Least Squares Algorithms for Sparse Signal Reconstruction Greedy Algorithms for Underdetermined but Sparse Solutions Author: Angshul Majumdar

Comments and Ratings on Angshul's Files View all
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17 Oct 2009 Non Convex Compressed Sensing for Non Gaussian Noise optimization of the form min ||x||_p subject to ||y-Ax||_q<e Author: Angshul Majumdar Becker, Stephen

Matlab updated their LSQR function around 2008. The old version was buggy, as you probably know (since you recommended a different version of LSQR), but anyone with a newer release of Matlab (e.g. 2009 and more recent) can use their existing LSQR function.
-Stephen
27 Sep 2009 Non Convex Algorithms for Group Sparse Optimization Reweighted Lm,p algorithm Smoothed L2,0 algorithm Author: Angshul Majumdar zhenhua, xu

thanks!
08 Sep 2009 Non Convex Compressed Sensing for Non Gaussian Noise optimization of the form min ||x||_p subject to ||y-Ax||_q<e Author: Angshul Majumdar Majumdar, Angshul

itecheck has something to do with the version of Matlab you are using. U can search the iterchk function online from google and add it to your Matlab Path.
04 Aug 2009 Non Convex Compressed Sensing for Non Gaussian Noise optimization of the form min ||x||_p subject to ||y-Ax||_q<e Author: Angshul Majumdar Pamplona, Universidad

Hi Dr. Majundar. excellent contribution. I want to discuss something, when I run the algoritrmo this problem: Undefined function or method 'iterchk' for input arguments of type 'function_handle'

can you please help me to understand my mistake in using your code thanks

Luis enrique M.
03 Aug 2009 Non Convex Compressed Sensing for Non Gaussian Noise optimization of the form min ||x||_p subject to ||y-Ax||_q<e Author: Angshul Majumdar Hadji, Lila

Dear Angshul,

I am real interested on your toolbox of resolving non convex optimization, for sparse signal recovery.I tried to use your code, and run the file demo.m, but without success
here is the error that I had got:

 Undefined function or method 'opMatrix' for input arguments of type 'double'.

Error in ==> rwlspq at 26
     AOp = opMatrix(A); clear A

Error in ==> demo at 6
x1 = rwlspq(A,ybar,0.4,3);

can you please help me to understand my mistake in using your code and where can I find the functions
     opMatrix and iterchk?

Yours gratfully
Lila

Top Tags Applied by Angshul
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optimization, signal processing, image processing, simulation, earth science
Files Tagged by Angshul View all
  • 1 - 5 of
  • 8
Updated   File Tags Downloads
(last 30 days) 		Comments Rating
11 Aug 2009 Non Convex Algorithms for Group Sparse Optimization Reweighted Lm,p algorithm Smoothed L2,0 algorithm Author: Angshul Majumdar communications, modeling, nonconvex, simulation, matrix, optimization 50 1
04 Aug 2009 Non Convex Compressed Sensing for Non Gaussian Noise optimization of the form min ||x||_p subject to ||y-Ax||_q<e Author: Angshul Majumdar simulation, optimization, earth science, mathematics, image processing, signal processing 53 4
07 Jun 2009 Compressive Classifier Classifiers Robust to Dimensionality Reduction via Random Projections Author: Angshul Majumdar simulation, optimization, classification, image processing, signal processing 30 0
24 Mar 2009 Greedy Algorithms promoting Group Sparsity V3 Approximate Greedy Solutions to the problem min||x(k)||_2,0 such that Ax = b Author: Angshul Majumdar modeling, optimization, earth science, system identification, image processing, signal processing 26 0
30 Jan 2009 Greedy Algorithms promoting Group Sparsity V2 Approximate Greedy Solutions to the problem min||x(k)||_2,0 such that Ax = b Author: Angshul Majumdar interpolation, simulation, compressive sampling, group sparsity, optimization, earth science 41 0
 

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