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Aug
6
comment How can I get the number of slots in Function?
That makes sense. Don't know why I didn't think of that. Sorry. I only realized that *## doesn't work (and -## neither for that matter). Thanks for the link, I wasn't aware of that post. I looked for "monad" but came up empty handed.
Aug
6
comment How can I get the number of slots in Function?
Mr.Wizard, can you explain how the evaluation of (3) works? Why is + special in this respect and are there other operators which work in the same way?
Aug
6
revised What's the difference between Inactive and HoldForm?
added 429 characters in body
Aug
5
comment Making time-index dependent state-space models - where has the Kalman filter gone?
I see... It seems you're right and Mathematica doesn't support time-dependent Kalman filtering out of the box right now. On the other hand (and I'm guessing you know that), it is fairly easy to implement this functionality yourself (at least for simple models).
Aug
4
comment the winding number for the circle map (Arnold tongue)
Maybe, but I don't want to expand the nested expression for n=500. Only machines with a lot of memory will be able to handle it.
Aug
4
revised the winding number for the circle map (Arnold tongue)
updated performance comparison
Aug
4
comment the winding number for the circle map (Arnold tongue)
Ok, put my timings there. (The original timings were different for me, so I exchanged all of them. Hope that's ok.)
Aug
4
suggested approved edit on the winding number for the circle map (Arnold tongue)
Aug
4
comment the winding number for the circle map (Arnold tongue)
That's not a fair comparison though, as ff[1/100,1/500] will compute the exact solution. Try ff@@SetPrecision[{1/100, 1/500}, 880];//AbsoluteTiming! For me the timing differences are negligible.
Aug
4
comment Making time-index dependent state-space models - where has the Kalman filter gone?
What exactly is the question? You are looking for KalmanEstimator I think. And StateSpaceModel is not new btw, it's been there since V8.
Aug
3
comment Why does Mathematica appear to change the head of certain expressions?
Mr.Wizard, do you have new insight in the problem with the short forms you linked to? You said in one of the comments you might post a partial solution at some point. I'm sure many people would be interested (including me)!
Aug
1
comment Dataset: cannot reproduce a basic example. A bug?
Works for me under Linux (both, directly evaluating the example in the docs and pasting this snippet)
Jul
31
comment How to group each element with each consecutive elements in one head
@Uh, I like the use of the new Composition operator! Also, I would have gone with MapIndexed too but maybe combined it with Outer(but I don't have Mathematica to test right now)
Jul
30
comment Minimum and maximum values under conditions
Damn you... ;-)
Jul
30
comment Minimum and maximum values under conditions
I think my new version is even faster though!
Jul
30
revised Minimum and maximum values under conditions
added 111 characters in body
Jul
30
comment Minimum and maximum values under conditions
Well that was just a matter of time, wasn't it... :)
Jul
29
answered Minimum and maximum values under conditions
Jul
28
comment Using ReplaceAll to replace a head
I find the last statement that "Replace [...] acts from the inside out" rather missleading. What about Replace[a[b[c, d]], head_[arg__] :> newHead[arg]]?
Jul
27
comment Best practice of passing a large number of parameters to functions
@Mr.Wizard I was referring to the latter case. Thx for the explanation!