44,911 reputation
343126
bio website
location United States
age
visits member for 1 year, 11 months
seen 5 hours ago

5h
comment How to create 3d region of f[x,y] over triangular region on xy plane?
You're welcome! (+1 already.)
5h
answered How to create 3d region of f[x,y] over triangular region on xy plane?
5h
answered Injecting list of controls into manipulate
6h
reviewed Close Calculating a Volume Integral limited by two z planes and a given conical surface
6h
reviewed Reviewed Finding the number that gives remainder equal to 0
6h
comment Finding the number that gives remainder equal to 0
Is this a question about how to use the software Mathematica? If it is about mathematics, there is a different site, math.stackexchange.com, for such questions.
6h
reviewed Reviewed Plotting ODE solutions with two parameters
6h
comment Plotting ODE solutions with two parameters
There are examples in the documentation for ParametricNDSolve and ParametricNDSolveValue. If you showed how you're using it, someone might be able to point out any mistakes.
6h
comment Can anyone help me to get the solution of this first order ODE?
@lxy I don't think I missed a minus sign: y[x]^(3/2) == -Sqrt[y[x]^3] when y[x] < 0 as specified in your initial condition, which I mentioned at the beginning of my answer. I'm not sure what other minus sign you might mean -- is there another?
12h
comment Problem with DensityPlot Plot3d of Heavisde function
Perhaps ListPlot3D[Flatten[Table[{x, y, w[x, y]}, {x, -5.0001, 5, 1/10}, {y, -5, 5}], 1]] is a nice compromise. An accurate cross section, Plot[w[x, 0], {x, -1, 3}, PlotPoints -> 801, PlotRange -> {0, 101}], has a lot of detail
13h
revised Double integral over a parallelogram
Updated for V10
14h
answered Can anyone help me to get the solution of this first order ODE?
17h
answered TreePlot Vertex Labelling
1d
comment List(Line)Plot with a big jump
The answer may be found in the documentation here, too.
1d
comment Direction Field for an Ordinary Differential Equation
@Pickett No big deal. Good find, although I realize you may have had an advantage. :)
1d
comment Direction Field for an Ordinary Differential Equation
@Pickett I can't imagine a better answer than Mark's answer to 43478. I suppose one could replace the 0.03 by 0.5 divided by the number of VectorPoints (15), or deal with the slightly off lengths due to the AspectRatio.
1d
comment Direction Field for an Ordinary Differential Equation
Mark McClure has done some nice things. E.g. mathematica.stackexchange.com/questions/43155/…
1d
comment Finding out all undocumented values for “Properties” in XxxData[] functions
AstronomicalData also checks Union[Join @@ DataPaclets`AstronomicalDataDump`$Properties /@ DataPaclets`AstronomicalDataDump`$SourceGroups] (of length 771). But this larger number 771, like most of the 419 CountryData properties in $PropertyHash, are due to subproperties. (It seems that Entity* functions might be replacing the *Data functions, maybe?)
1d
revised Finding out all undocumented values for “Properties” in XxxData[] functions
edited body
1d
comment ColorFunction that depends on angle of line
ArcTan runs from -π to π. Check out Rescale. E.g. Hue[Rescale[ArcTan[x,y],{-Pi,Pi}]] or something like that.