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12h
comment Solving a system of equations involving partial derivatives for a wave
I'm voting to close this question as off-topic because it's not formulated in a mathematically consistent way. If t is a scalar variable then the LHS is a vector but the RHS is a matrix.
1d
answered Evaluation control with TagSet
1d
comment The space in default output of `ExportString` to Latex
@AlexeyBobrick I don't see this issue in PDF with Mathematica version 8. But if you can reproduce it, you could ask a new question.
1d
comment The space in default output of `ExportString` to Latex
@AlexeyBobrick That's probably a completely different issue. You might try this answer instead.
1d
comment The space in default output of `ExportString` to Latex
@AlexeyBobrick The correct way to enter textual subscripts would be to enclose them in quotation marks in the Mathematica expression. I.e., "min" etc. It gets translated to \text{min}, which is the right way to present multi-letter symbols in LaTeX (you should never simply write multi-letter names as plain characters in LaTeX because they're typeset as separate variables).
1d
comment Hypergeometric function with a matrix argument
Yes, there must have been a miscommunication because I assumed you wanted the kind of output given in Wolfgang's answer. It would be better to edit the question and its title to include the requirement that you want a scalar output for a matrix function. The links in the question are too lengthy for me to read through at the moment.
2d
comment Refercing generic derivatives
Yes, e.g. like this: {D[f[x, y], x], D[f[x, y], y]} /. Thread[{x, y} -> {0, 0}]. Or also Through[Through[{Derivative[1,0],Derivative[0,1]}[f]][x,y]].
Jan
28
comment My code of plotting a two-variable function is too slow
First check if the slow part is already contained in Table[F[x, p], {p, {10^7, 10^8, 10^9, 10^10, 10^11}}, {x, 0.01, 0.9901, 0.01}]]. Then narrow it down by reducing the list.
Jan
27
answered Series expansion of large expression
Jan
26
comment TensorReduce not simplifying transpose for symmetric matrix?
If you aren't really interested in tensor algebra, then you may as well just go the simple route: Transpose[G] ^= G. With this, G.G-G.Transpose[G] directly evaluates to 0.
Jan
26
awarded  Yearling
Jan
26
comment How to render a 3d image of the galaxy?
Here you go: ExampleData[{"Geometry3D", "Phobos"}]. This is "some galactic body." If you want something else, you have to be more specific and show what you have tried, to pinpoint where your Mathematica problem is.
Jan
25
answered Polynomial expansion of operator
Jan
22
comment Bug in associated Legendre Polynomials?
Actually, I think there is something wrong here. The answer is correct if taken by itself, but it is inconsistent with the definition of SphericalHarmonicY because there you do get 0 for {l,m} = {1,-1}.
Jan
19
reviewed Close ListPlot3D with the color choosen from another list
Jan
19
reviewed Close DSolve versus DSolveValue
Jan
19
reviewed Close How to display grids in separate cells?
Jan
19
reviewed Close What to do when you encounter SystemException[“MemoryAllocationFailure” during an Optimization
Jan
19
comment Embed 3D objects from Mathematica, in a pdf
Looks like u3d export is really hard to come by, except for jReality. You might try that...
Jan
19
comment Embed 3D objects from Mathematica, in a pdf
Oh, you can also google latex package media9. I just mention texdoc because that's the standard way to get documentation about TeX packages. That package I refer to allows you embed 3D objects in PDF. But it's a bunch of steps that need to be done external to Mathematica. In fact, the main obstacle is that you need u3d format, and Mathematica doesn't export that directly.