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Stephen Becker


University of Colorado Boulder

23 total contributions since 2008

Professor of applied math
Professional Interests: optimization, signal processing

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Submitted


CoSaMP and OMP for sparse recovery
Orthogonal Matching Pursuit (OMP) and Compressive Sampling Matched Pursuit (CoSaMP).

4 months ago | 101 downloads |

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Submitted


Sparsified K-Means
Extremely fast K-Means for big data

5 months ago | 24 downloads |

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Submitted


fastRPCA
Code for Robust PCA

9 months ago | 23 downloads |

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Submitted


zeroSR1
Very fast code for solving lasso and non-negative least-squares problems

1 year ago | 6 downloads |

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Submitted


LBFGSB (L-BFGS-B) mex wrapper
Mex wrapper for lbfgsb v3.0 fortan library. L-bfgs-b solves box-constrained optimization.

2 years ago | 48 downloads |

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Question


Take advantage of Hermitian matrices with eigs
I want to use "eigs" on a Hermitian matrix. If I have a symmetric matrix, I can tell "eigs" that it is symmetric (and real) and ...

4 years ago | 1 Answers | 0

1

answer

Submitted


mex interface for bound constrained optimization via ASA
ASA solves bound constrained problems; the user provides routines to calculate the function and grad

4 years ago | 1 downloads |

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Answered
Using GotoBLAS2 in a MATLAB MEX file (shared library help?)
Matlab is probably adding a -lmwblas flag somewhere, so their version of blas is overriding yours. You can probably edit mexopts...

5 years ago | 0

Responded


Re: If your ifft slower than your fft?
Yeah, that agrees with the conclusion I reached (see above). I think we can safely say this topic is closed.

5 years ago | 5177 views

Responded


Re: If your ifft slower than your fft?
Anyone else able to recreate this?

5 years ago | 5177 views

Responded


Re: If your ifft slower than your fft?
Hi guys, thanks for the suggestions. I was profiling a DCT so both the fft and ifft were complex, but when I was verifying the t...

5 years ago | 5177 views

Responded


Re: blas on mac
I had some issues with LAPACK and BLAS recently, and it was due to 64-bit issues and not having the right prototypes (I guess I ...

7 years ago | 4309 views

Responded


Re: New fuzzy controller
I have seen this error myself, and I don't think it's necessarily an error, because my mex files actually run just fine. The me...

8 years ago | 2920 views

Responded


Re: jit (just in time) accelerator
Steve, you asked why I would want to turn the JIT off. The answer is BECAUSE the JIT is undocumented. As you suggest, one shou...

8 years ago | 17723 views

Responded


Re: jit (just in time) accelerator
It's nice to hear from so many Steve/Steven/Stephens! Bringing the subject back to the JIT accelerator... I can see two separa...

8 years ago | 17723 views

Responded


Re: jit (just in time) accelerator
Thanks for the responses so far -- these are partially helpful. But, both comments suggest that I basically just write good c...

8 years ago | 17723 views

Posted


jit (just in time) accelerator
I recently learned a bit about the Just-In=Time (JIT) accelerator when I noticed that certain code ran faster on different versi...

8 years ago | 17723 views

Responded


Re: How to prevent malicious system calls?
I would be very interested in learning what they do for the Matlab competitions. Anyone know? Quoting:

8 years ago | 4479 views

Responded


Re: How to prevent malicious system calls?
That's an interesting idea, but I can also just search their scripts for those keywords. Either way, it requires me to predict ...

8 years ago | 4479 views

Posted


How to prevent malicious system calls?
I am teaching a class that will require students to upload Matlab files, which I will then run. My question is, how can I ensur...

8 years ago | 4479 views

Submitted


idctt
type II Inverse DCT (i.e. type III DCT)

9 years ago | 6 downloads |

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Submitted


dctt
type II DCT, improvement to matlab's dct

9 years ago | 4 downloads |

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Submitted


persistent fft
fft via a radix2 algorithm

9 years ago | 3 downloads |

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