Hi everyone! My question "Conversion of planar Cartesian coordinates into spherical coordinates" has been closed for being not "about research level mathematics within the scope defined in the help center". However, it is not for homework help, nor for discussion, not about MathOverflow itself.
It is related to a personal study in mathematics: they also may be questions that you come across when you are reading scholarly journals or advanced graduate level books in mathematics, states the Help center, and that is my motive.
Is it possible to take a data set of points in R^3 (specifically, points in the xy-plane) and convert them to a surface of a sphere? Is there any mathematical formula for this?
After the suggestion of @ManfredWeis, I looked for stereographic projections, and here is a Cartesian grid on the plane...
@MattF. The doubt arose while surfing through several readings of multivariable calculus; it is not directly related to any specific excerpt, but has a variety of links also with other topics I'm facing and interested in.
Cultural question too banal for MO: What's the joke about French mathematicians? I've heard it from the mouth of a probability professor as well as a comment on MO, and whenever I hear something like that I think, "I must confirm if this is a subcultural meme."
