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May
7
comment How to implement symbolic Ramanujan's summation in Mathematica?
Well, actually I really tried to solve this problem for a while on the day you raised this question, but finally be confused and worn out by the definition in the wikipedia page. There seems to be several different definitions in wiki, and none of them produces the desired result, maybe I didn't understand them correctly...
May
7
comment How to implement symbolic Ramanujan's summation in Mathematica?
@Anixx What's the definition of $\Delta[]$?
May
7
comment Speed up the auxiliary function magicSquare when $n$ is doubly-even
@ShutaoTang I've added some brief explanation, hope it helps.
May
7
revised Speed up the auxiliary function magicSquare when $n$ is doubly-even
some explanation added.
May
6
revised Speed up the auxiliary function magicSquare when $n$ is doubly-even
deleted 2 characters in body
May
6
revised Speed up the auxiliary function magicSquare when $n$ is doubly-even
deleted 2 characters in body
May
6
revised Speed up the auxiliary function magicSquare when $n$ is doubly-even
add a faster magicQ
May
6
comment Speed up the auxiliary function magicSquare when $n$ is doubly-even
Where's the definition of magic1? By the way Tr@Transpose@mat should be something like Tr@Reverse@mat.
May
6
revised Speed up the auxiliary function magicSquare when $n$ is doubly-even
add a faster version
May
6
answered Speed up the auxiliary function magicSquare when $n$ is doubly-even
May
6
reviewed Close Solving a vector equation
May
6
reviewed Close Quantile-quantile plot
May
6
reviewed Leave Open Extracting part of an expression
May
6
reviewed Close What particular situation do we have to use RuleDelayed after replacement?
May
6
comment Can we abuse notation and write equations in differential one-form?
I think you really uncovered a blind spot! Now the procedure seems to be evident: Dt[y[x]] evaluates to y'[x] Dt[x] and for any correct DE Dt[x] will be eliminated finally. But these thoughts never came to me!
May
6
comment Why does DSolve not give the expected analytical solution for a system of DAE?
I'm not an expert of DAE, but I think for a linear system it's natural to have only one solution. Can you provide a proof for your belief?
May
5
comment Problem solving a nonlinear partial differential diffusion equation
v10 manages to handle bc[[1]] and bc2[[1]]? I think they're redundant, actually they cause failures of NDSolve in v9.
May
5
comment Why does DSolve not give the expected analytical solution for a system of DAE?
Why you think your by-hand result is correct? Maple's result is the same as Mathematica's: i.stack.imgur.com/OYav3.png
May
4
comment Integral formula for the inverse Laplace transform doesn't work?
@Guesswhoitis. Long time no see, J.M. :) How about giving an answer? I'm not that familiar with Hankel contour.
May
4
comment Computing the coefficients for Gaussian integral
Is it a programming practice or you just need the Gaussian integral weights? If the latter, search GaussianQuadratureWeights in the document.