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2h
comment solving non-linear set of equations using NSolve in order to get all roots
Use "Save Selection As" in Mathematica, save the plot as a gif or other format, use the image selector to place it in your post (sixth icon from the left).
2h
comment Why doesn't Mathematica evaluate this simple limit?
@Calchas It certainly could be, although I'm surprised to see that large a difference. Might have to do with usage, or not, or extended precision registers (which is certainly platform dependent). Look up "cancellation error" and you might get an idea of what is happening.
20h
comment Why doesn't Mathematica evaluate this simple limit?
@Calchas The numeric evaluation, yes. I am assuming you did something equivalent to this: N[(n - Sqrt[Sin[n] + 10 n + n^2])^2 /. n -> 10^18]. Also note that if you use 10^10 in the replacement it actually gives 25. If you did something else then I may have misunderstood the comment re "interesting numerical answers".
21h
comment Why doesn't Mathematica evaluate this simple limit?
@Calchas That numeric behavior is a straightforward consequence of machine arithmetic cancellation error.
1d
comment Can I get a closed form solution using Mathematica symbolically?
I'd be surprised if a closed for exists. Also the formulation is a bit confusing since there are lower case and upper case r, R and it's not clear to me where the former enter the picture.
1d
comment Finding solution of equation with differentials
Yes, this really needs some code effort. With that added I'd be happy to see it reopened.
1d
awarded  Nice Answer
1d
comment ThermodynamicData missing
A clear case of site entropy if ever I saw one..
1d
comment Visualizing Type System Operations
@LeonidShifrin Thanks for the explanation. I was feeling early signs of upvote checkmark envy.
2d
comment Visualizing Type System Operations
@LeonidShifrin Can you really give bigger +1's than the rest of us? You make me a bit nervous.
Jul
24
comment Why doesn't Mathematica evaluate this simple limit?
Limit code is not dealing well with that Sin[n] term. It uses Series which really has no "nice" representation for sine at infinity. Would be good to replace it with Interval[{-1,1}] maybe (I mean in the Limit code, not at the user end).
Jul
24
comment Polynomials with integer coefficients vs. polynomials with rational coefficients
Check documentation for Rationalize.
Jul
24
comment Given a set of four linearly independent vectors, how can I compute two additional linearly independent vectors?
@Belisarius Are you by chance also related to Cole?
Jul
24
comment Why does this evaluate to {}?
Most likely you want to find the simpltaneous zero set, that is, Solve[{f[x,y]==0,g[x,y]==0},{x,y}].
Jul
24
comment Given a set of four linearly independent vectors, how can I compute two additional linearly independent vectors?
If working over the reals, say, you could just pick two random vectors. (And if the result is not a complete basis, shoot your rng.)
Jul
23
comment A With expression local variable specification without head List
It's not likely to come back.As noted by @StefanR. it caused actual trouble (conflict with existing evaluation semantics).
Jul
23
comment A With expression local variable specification without head List
That bit of documentation is a bug so feel free to add that tag. One thing this was not is documentation driven development.
Jul
22
comment Undocumented fourth parameter of Collect; how long has it been there?
It is not really the most carefully designed of features. (Or so claims the developer who put it in 20 or so years ago.)
Jul
22
comment Undocumented fourth parameter of Collect; how long has it been there?
Introduced in either version 3 or 4, I forget which. Not sure if it has changed since then.
Jul
19
comment How to find an estimated root efficiently with binary stochastic estimation of the function?
Sorry, that was a bit vague. I meant for f the defining (implicit) function for the boundary, which assumes you have one.If you do not, but have an inside/outside function, then maybe the second approach makes sense.