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Feb
28
comment Diagonal minors of matrix
"Since I am going to calculate the minors of big matrices and I only need to know the diagonal elements, is there a way just to calculate the diagonal elements in minor matrix?" — Surely, performance is an issue here.
Feb
10
awarded  Nice Answer
Feb
10
awarded  Necromancer
Feb
10
comment Convex optimization
@DanielLichtblau The remark included the clause following it — "and enforce sparsity". NMinimize handles $\ell_1$ minimization fine. In compressive sensing/sparse theory, one wishes to solve an $\ell_0$ minimization problem, but because that is NP-hard, you do $\ell_p,\ 0<p\le 1$ minimization under certain assumptions/conditions and with other possibly non-linear constraints. I guess my phrasing wasn't the best way to put it but nothing better comes to mind now... will update it if I think of something better.
Feb
8
awarded  Revival
Feb
8
comment Convex optimization
@rhermans I missed your 200 bounty (was on vacation) but I hope the answer is helpful :)
Feb
8
comment Convex optimization
@rhermans I missed your 200 bounty (was on vacation) but I hope the answer is helpful :)
Feb
8
answered Convex optimization
Feb
7
awarded  Good Answer
Feb
4
awarded  Nice Answer
Feb
1
comment Why Mathematica chooses bracket for function arguments over parenthesis?
"If function arguments are denotes as f(x), then array[i] could be used as array index.(c.f. Mathematica uses [[i]] here.)" — is (f + g)(x + y) parenthesizing and multiplying two terms or is it a function call (like (f + g)[x + y] in the current syntax)?
Jan
31
awarded  Nice Answer
Jan
29
awarded  Good Answer
Jan
17
awarded  Yearling
Jan
15
awarded  Notable Question
Jan
10
comment Invert Colors Stylesheet White on Black
You can also look at this answer of mine for some hints on what to change and where, and maybe also look through Mike Honeychurch's answers in notebooks/stylesheets tags. Also look through the Default.nb and Core.nb stylesheets for the base styles that you can modify. It's a lot of boring work.
Jan
10
comment Invert Colors Stylesheet White on Black
If the older one hasn't been answered because it is difficult, then yours won't be either. If the older one wasn't answered because it wasn't interesting, then yours probably won't be either... questions on stylesheets are fickle and often it's the case that the answer is "straightforward" but no one wants to do the grunt work. In any case, you might try sweetening the deal with a bounty on the original and see if someone will take the bait :)
Jan
9
revised How well does my function fit data?
rolled back to a previous revision
Jan
7
comment Is there an equivalent of “pmtm” of MATLAB?
We can't help with C++/C# conversion either. You can look at the source code by typing edit pmtm. That should give you hints to proceed with your translation attempts.
Jan
7
comment Is there an equivalent of “pmtm” of MATLAB?
If you use MATLink, then it is as simple as pmtm = MFunction["pmtm", "OutputArguments" -> 2] after you initialize the package. You'd call it as {p, f} = pmtm[data, tapers, n, fs].