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8h
comment Finding a formula for a 3D shape and colouring it
@Marco There you've it
2d
comment Unnecessary free space under the figure
In v9 everything looks OK. Is this a v10 thing?
2d
comment Issue in NDSolve and unknown error
This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post - you can always comment on your own posts, and once you have sufficient reputation you will be able to comment on any post.
2d
comment SetOptions for CoordinatesToolOptions for DateListPlot?
Anyway, His uniqueness isn't a proven fact
Apr
15
comment How do I input an integral that needs to use Cauchy's formula?
You usually specify it by sending a letter
Apr
15
comment Enigmatic message about MaxBend
It's probably not a bug, but a bug
Apr
15
comment Does the two function for the same input leads to same output?
So edit your question accordingly
Apr
15
comment Does the two function for the same input leads to same output?
Of course, just set x[_] := 0
Apr
14
comment Solving equations bounded by a region
Have you tried starting a fresh Mma session?
Apr
14
comment Solving equations bounded by a region
cc = {c1, c2, c3} = 1 - 3 Sin[theta]^2 Cos[phi - 2 Pi (# - 1)/3]^2 & /@ {1, 2, 3}; v = {E^(-I y), E^(-Sqrt@3/2 I x), E^(-Sqrt@3/2 I x)}; f = cc.v; llr = Re[TrigExpand@f // ExpToTrig] /. __ + Re[x_] :> x; lli = Im[TrigExpand@f // ExpToTrig] /. Im[__] + x_ :> x /. Re -> Identity; Reduce[{lli == 0 && llr == 0}, {x, y}]
Apr
14
comment Problem evaluating function
f[y_] := Sum[D[LegendreP[n, Cos[x]], x] /. x -> y, {n, 10}]
Apr
14
comment Why NDSolve cannot solve such a simple set of differential equations?
@Fred Vector ODEs were introduced in v9 and the syntax isn't very intuitive. As a matter of fact, you should try until it works :(
Apr
14
comment Iterator variable not blocked in ParametricPlot
It's not a bug. It's a feature called "A New Kind of r"
Apr
13
comment Series Expansion true or false
You're posting at the wrong site. True or False?
Apr
13
comment Strange Integrate messages / $RecursionLimit being ignored
For Even n is very similar
Apr
13
comment Strange Integrate messages / $RecursionLimit being ignored
For odd n -> 1/2^n Pi Tr@ Table[Binomial[n, Floor[n/2] - j ] BesselJ[0, 2 j + 1], {j, 0, Ceiling[n/2]}]
Apr
13
comment Fixed colors for fixed values in contourplot legend
Use ColorFunction -> ColorData[{"Rainbow", {0, 3}}], ColorFunctionScaling -> False on both plots
Apr
13
comment Plotting six chosen rows of a matrix
@johnhenry Please try the code with Wab = RandomReal[{0, 1}, {n, n}]; . If it works .... it's your matrix :)
Apr
13
comment Plotting six chosen rows of a matrix
@johnhenry Then your W isn't a 4x4 (or larger) matrix ...
Apr
13
comment How to draw a tropical surface?
Perhaps fns[u_, v_, w_] := {u, v, w, 0}; k = 20; RegionPlot3D[ First@Differences[Sort[fns[u, v, w]][[1 ;; 2]]] == 0, {u, -k, k}, {v, -k, k}, {w, -k, k}, PlotPoints -> 50]