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answered Reaction-diffusion PDE with NDSolve: either very slow or very inaccurate
2d
awarded  Generalist
Feb
11
comment ParametricPlot3D for only part of a sphere
@Jason B Of course, I was simply lazy today.
Feb
11
revised ParametricPlot3D for only part of a sphere
added 145 characters in body
Feb
11
comment ParametricPlot3D for only part of a sphere
@Jason B You are right. I will edit the answer.
Feb
11
answered ParametricPlot3D for only part of a sphere
Feb
10
comment Alternative to the `DiscretizeRegion`?
@bill s Using mesh would be a nice idea. I do not see yet, what function do you have in mind to use to create a mesh out of ri ? Could you kindly give a hint?
Feb
10
comment Alternative to the `DiscretizeRegion`?
@Jason B Show[ RegionPlot[{pgn, ri}], ListLinePlot@line] does not work for me. I need not only to visualize, but I work with the region in question. It is not shown in my question. In the end I visualize the result together with the region in which it is obtained, another result together with its region and so on. It is, of course, possible, to work with the region, and then to visualize using Show , but it is more comfortable to work and visualize within the same paradigm. I hoped that I missed some useful function.
Feb
10
comment Alternative to the `DiscretizeRegion`?
@Jason B Yes, I fixed it.
Feb
10
revised Alternative to the `DiscretizeRegion`?
added 51 characters in body
Feb
10
asked Alternative to the `DiscretizeRegion`?
Feb
10
comment Why doesn't this pattern work?
@ Fred Simons Thank you. That was my point that these two functions, though looking close from the first glance, are in reality different. Now I understand.
Feb
10
comment Why doesn't this pattern work?
@ Mr.Wizard Thank you, I've got it.
Feb
10
answered Expression of an integral
Feb
9
accepted How to extract a contour line (or a region) from a ContourPlot?
Feb
9
comment How to extract a contour line (or a region) from a ContourPlot?
Thank you, Marco, this is, however, not what I had in mind. The function x*Exp[-x^2 - y^2] above was only given for the illustrative purposes. I would like to act, as if this function is unknown and cannot be used. I will then apply it to cases, in which such a function is not known, but the ContourPlot is available.
Feb
9
comment How to extract a contour line (or a region) from a ContourPlot?
Michael, what is mesh in your code above?
Feb
9
comment How to extract a contour line (or a region) from a ContourPlot?
Thank you. Could you please kindly comment, what does Normal when acting on ContourPlot. Intuitively it seems to create a mesh and form the lists corresponding to the contours. Am I right? I could not find any explanation in the documentation.
Feb
9
answered A series of Manipulate activities in a notebook
Feb
9
comment Why doesn't this pattern work?
@Fred Simons Dear Fred, could you please kindly comment the following. The function Select is quite close to Count by its functionality. However, it recognizes the pattern argument in the form given in the above question, that is, just #>1.5& as follows: Select[{1, 1, 2, 3}, (# > 1.5 &)] returns {2, 3}. What is the difference between these two cases?