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21h
revised Numerical solution of IVP for linear ODE with variable coefficient runs wild soon
added 4 characters in body
22h
comment In WolframAlpha, how can I make a Scatter Plot without connecting points?
Seems that parentheses aren't necessary: wolframalpha.com/input/…
1d
revised Numerical solution of IVP for linear ODE with variable coefficient runs wild soon
deleted 1 character in body
1d
revised Numerical solution of IVP for linear ODE with variable coefficient runs wild soon
added 2 characters in body
1d
asked Numerical solution of IVP for linear ODE with variable coefficient runs wild soon
1d
answered Numerical solution of IVP for linear ODE with variable coefficient runs wild soon
2d
comment Better method to swap the values of two 2-D arrays
There are two $a_{k+1,k+1}$ in the matrix?
Apr
23
comment Solving coupled differential equations with an eigenvalue
I noticed that you've modified your equations for several times, are you sure it's correct this time? Maybe you can show us the original problem?
Apr
23
comment Bizarre Compile Error, changing one symbol
Where's the definition of nSites?
Apr
23
accepted Analogue for Maple's dchange - change of variables in differential expressions
Apr
22
revised Analogue for Maple's dchange - change of variables in differential expressions
After checking the dictionary, now I'm sure it's a typo :)
Apr
21
revised BC for transport equation using NDSolve
Improve the format
Apr
21
comment Solving coupled differential equations with an eigenvalue
As mentioned above, ϕ[Ei] == 0 and ϕ'[Ei] == 0 give two equations, use either of them inside FindRoot or RootSearch will give you a result.
Apr
21
revised solve ODE with divergencies
Improve the format
Apr
21
revised solve ODE with divergencies
Improve the format.
Apr
21
revised solve ODE with divergencies
Improve the format
Apr
21
comment Analogue for Maple's dchange - change of variables in differential expressions
After playing with it a bit, I feel that writing one-element list is a little inconvenient. It'll be good if syntax like dChange[D[u[x, t], t] == D[u[x, t], {x, 2}], x == ξ s[t], x, ξ, u[x, t]] is supported. Not sure what's the standard way to implement this, though. (Something like {internalold, internalfun} = If[Head@# =!= List, {#}, #] & /@ {oldVars, functions} ?)
Apr
20
comment RegionPlot3D exponentiation issue [Mathematica 10]
No, it's not empty, if you look carefully, you'll see one point at the origin, and it's the only point inside the region.
Apr
20
revised Analogue for Maple's dchange - change of variables in differential expressions
added 2 characters in body
Apr
20
comment Analogue for Maple's dchange - change of variables in differential expressions
Your design for the syntax is undoubtedly more Mathematica-like and more reasonable. (I admit that when writing the question I haven't deliberated on the syntax design. )