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4h
comment How to enter piecewise functions into Mathematica
Also, to fully comply with the "number line" tip: one would want to express inequalities in terms of < or <=; so, 1 < x.
7h
comment Discrete Convolution
How peculiar. It is claimed that ListConvolve[]/ListCorrelate[] use FFT under the hood, and yet they're beaten out by an explicit FFT.
7h
comment How to sort colors properly?
Since you're going down this route: you could also try sorting the colors in Morton order.
7h
comment How I can integrate $\int_0^{a} x e^{-\frac{b^2 x^2}{2 c}} J_0(n x) dx$?
This is what I was referring to in my comment. Your confluent hypergeometric function can be simplified further into an incomplete gamma function.
16h
comment How to solve a nonlinear overdetermined system of equations
Why not reformulate as an optimization problem that you can give to FindMinimum[]/NMinimize[]?
19h
comment Please explain this unexpected code snippet behavior
See the link below the title.
1d
comment Axis/Angle from rotation matrix
Yes, I was combing through a few papers when I saw this, and remembered your answer. :)
1d
comment How I can count multiplications in an experssion?
It may be inappropriate to count $k-1$ multiplications for $x^k$; binary exponentiation can certainly do that with less multiplications in some cases.
1d
comment Implicit derivatives in one line. How do I do it?
Look up Dt[].
1d
comment Implicit derivatives in one line. How do I do it?
I don't see a question anywhere…
1d
comment Axis/Angle from rotation matrix
Have you seen this paper? (Also here.)
1d
comment Is it possible to change default $HistoryLength
Edit init.m to include your desired setting.
1d
comment Please explain this unexpected code snippet behavior
Yes, it was the inexact numbers that did it. Use Chop[].
1d
comment How to write my own interpolation method
The method underlying the "Spline" option is more or less elaborated in the accepted answer to the duplicate question.
1d
comment gaussian integration
Have you seen this?
1d
comment Better way to binarize an image
Can you try reposting your first image to imgur?
1d
comment Find a Fourier series from discrete data
I think your problem is a bit deeper than just finding a cosine series. Why not ask a new question about your PDE, and then link to this question of yours for context?
1d
comment What algorithms does NSolve use?
As for the multivariate case, see this paper by Auzinger and Stetter, and this paper by a certain Mr. Daniel Lichtblau.
1d
comment Compilable function with the functionality of SingularValueList
Also, do you really need the full SVD, if so? There are also methods for generating a partial decomposition corresponding to the largest singular values, for instance.
2d
comment Replace values in a list based on conditions
It's entirely your call. I just shared what I do in these situations. :)