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Aug
27
comment How to detect loops in a vector field?
@nikie I was just trying to get as much info as possible before going in the wrong direction. I see you've already answered based on an assumption such as what I was asking for... There could be different assumptions - it could bee the curl of a vector, or you could be thinking of limit cycles in a nonlinear system, etc.
Aug
27
comment How to detect loops in a vector field?
But the example you're using is not a physical system, and is in fact just not even a vector field because it is a discrete set of data points. So We first have to construct an interpolation. Are there any physical properties of the vector field that have to be satisfied in the interpolation? Whether lines will be closed for a given starting point will in general depend sensitively on the interpolation.
Aug
27
comment How to detect loops in a vector field?
Do you have any particular application for this? Usually, whether flow lines are closed or not isn't really of practical importance, but one can sometimes make up special interpretations for them, see here.
Aug
26
reviewed Leave Open How can I evaluate untrusted Mathematica code in a sandbox?
Aug
26
reviewed Close Fitting Data using GeometricBrownianMotionProcess
Aug
26
comment How can I evaluate untrusted Mathematica code in a sandbox?
Somewhat related: Automatically check student answers in tests
Aug
26
comment How to get the meaning of a Mathematica symbol you don't know ?
possible duplicate of What are the most common pitfalls awaiting new users?
Aug
26
answered 2D Fourier transform
Aug
25
comment 2D Fourier transform
The reason why NFourierTransform gives you an empty box is that it can only handle one-dimensional integrals. For a more robust numerical approach, you may want to look at 2D Fourier transform of a few (4) disjoint discs on a plane
Aug
25
answered Modifying the elements of a list according to a given probability
Aug
25
reviewed Close NDSolveValue returns NDSolveValue::ndnum
Aug
25
reviewed Leave Open Curl expression does not evaluate
Aug
25
reviewed Close Using precision in Mathematica code
Aug
25
reviewed Close Solving an ODE using shooting method
Aug
25
reviewed Close How can I number an equation associated with its section information automatically?
Aug
24
comment Curl expression does not evaluate
Paste VectorAnalysis/tutorial/VectorAnalysis into the Help browser and go to the bottom of the page. The three cylindrical components of the function are called f, g, and h there. See also my answer here.
Aug
24
comment Curl expression does not evaluate
@Willinski Although you are correct, I don't think the question needs to be closed, because the pertinent version-8 syntax is hard to find.
Aug
24
answered Curl expression does not evaluate
Aug
24
awarded  Good Answer
Aug
24
reviewed Close Constructing a grid of individual plots for data imported from a list of files