Reputation
60,885
Next tag badge:
121/100 score
19/20 answers
Badges
2 94 232
Newest
 Good Answer
Impact
~815k people reached

Aug
11
comment Working with derivative of conjugate of a complex number
Very closely related: Differentiation of an unknown function
Aug
11
comment Paths integrals in the complex plane
Related (possibly duplicate): Complex line integral and Definite Integral over a path
Aug
11
comment How to transform a list (of sums) into list of summands
@mfvonh Yes, this option for Heads is another nice thing about Replace.
Aug
11
comment How to transform a list (of sums) into list of summands
@ciao In any case it shows that you were reading very carefully. I didn't even notice that point at first.
Aug
11
comment How to transform a list (of sums) into list of summands
@ciao Thanks - you're right that the order could be tricky because you have to deal with the lexical rules.
Aug
11
comment How to transform a list (of sums) into list of summands
@Ciao Oh, right...
Aug
10
comment How to take the second derivative of a complicated function using limits
I can't reproduce your problem when setting for example Realn[x_]:=Re[Gamma[I x]]. Could you add an example that shows the issue?
Aug
10
comment Force evaluation of the right-hand side of a local variable definition
Relevant link, though not necessarily a duplicate due to Module: Evaluation in lambda function. There may well be other duplicate Q&As, but I haven't found one yet.
Aug
10
comment How to use FontWeight options in Mathematica 10.x
@SquareOne Indeed - the font panel that gets pulled up on the mac when pressing Apple-T is a "system specific panel", not created by Mathematica. It directly mirrors the structure of the font files as they are actually installed. But if you invoke the shortcuts Apple-B or I to change the style, you get the expected behavior. It's definitely a bug because you're really losing a lot of the styles that aren't derived from the base font simply by boldfacing or italicizing it. Those other styles probably could be extracted from the system dfont files and installed as separate fonts to be visible.
Aug
9
comment Adding labels to graphics
Maybe you should also look into SectorChart.
Aug
9
comment How to use FontWeight options in Mathematica 10.x
At least FontWeight -> "Bold" still seems to work. Somehow Mathematica is re-orgainizing the dfont contents, and losing information. But FontSlant still works. Combinations like "Bold Italic" are neither pure weight nor pure slant information, and maybe that's why they get ignored...
Aug
9
comment How does Mathematica calculate LaguerreL
@Guesswhoitis. Maybe - at least it's clear (I think) that the statement about the implementation on MathWorld doesn't quite tell the whole story.
Aug
8
comment How does Mathematica calculate LaguerreL
To simplify even further, you can replace the Pochhammer symbol by Binomial[a + n, n].
Aug
8
comment Where is the other half of my fourth degree Bézier curve?
I see the same on OS X with version 10.1 - in fact, the bug seems to persist for all degrees above the default 3. So I've added the bugs tag.
Aug
8
comment About how Mathematica understands the branchcuts of the complex logarithm [Part 3]
I'm voting to close this question as off-topic because the described plot cannot be reproduced with the given code.
Aug
7
comment how to differentiate formally?
@Pinocchio Of course it looks weird, but nonetheless it's a true statement because the derivative is taken with respect to a variable that (for n=1) doesn't occur in the sum. Therefore its value would be 1-n==0. What makes it a little confusing is that the output is not in the most simplified form because n still appears even though it can only have one value in that last line. Still, it's correct.
Aug
7
comment how to differentiate formally?
@Pinocchio No, the only other case in that sum is n=1.
Aug
7
comment how to differentiate formally?
@Pinocchio True is the entry that humans would call "otherwise" - it's the default alternative if none of the above holds.
Aug
7
comment Partial derivative of recursive exponential $f(x)=\sum^{K_2}_{k_2=1}c_{k_2}\exp(-z^{(2)}_{k2})$ w.r.t. the deepest parameter
What have you tried?
Aug
7
comment How does one verify the derivative of $ f(x) = \sum^{K_2}_{k_2=1} c_{k_2} \exp\left(- \big(a^{(2)} - t^{(2)}_{k_2}\big)^2\right)$
What have you tried?