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geek, nerd, physicist.


1d
answered DensityPlot and KroneckerDelta
Mar
25
comment How to find out where an error occurs?
@Alireza Before evaluating.
Mar
24
awarded  Yearling
Mar
24
comment How to find out where an error occurs?
@Szabolcs Thanks for the tip!
Mar
24
comment How to find out where an error occurs?
Try the built-in debugger: Evaluation>Debugger with Break at messages checked.
Mar
24
answered How to find out where an error occurs?
Mar
23
comment Using lists for creating another list
By the way, if Sqrt in the example is a complex user-defined function foo, you may need to use SetAttributes[foo, Listable].
Mar
23
answered Delete data were y = “NS” in a list with elements {x, y}
Mar
23
comment plotting a box in Mathematica
Manipulate[ Plot[h*UnitBox[x], {x, -0.6, 0.6}, PlotStyle -> {Red, Thickness[.004]}], {h, 0, 10}]
Mar
23
comment How could I add the WorldMap skin to this parametricPlot3d?
also the example here
Mar
23
comment How could I add the WorldMap skin to this parametricPlot3d?
refer to this post
Mar
23
comment Is there a bug in MatrixExp in Mathematica v10?
Confirmed the issue in ver.10. For your example specifically, since the matrix can be exactly diagonalized using Eigensystem, you can get a nice analytic expression--I'm assuming it's used in quantum mechanics where the matrix is the Hamiltonian (easily diagonalized in your example) and you want the unitary propagator with MatrixExp.
Mar
20
revised ReadList and ToExpression
added 154 characters in body
Mar
20
revised ReadList and ToExpression
added 80 characters in body
Mar
20
answered ReadList and ToExpression
Mar
20
comment Selective update of mySQL database column
The code you posted has mismatching quotes after # to begin with.
Mar
20
comment ReadList and ToExpression
The underscore _ as a pattern matching mechanism is reserved for mathematica.
Mar
18
comment Numerical integration and plotting
The OP wants to plot fC as a function fP, maybe like ParametricPlot[{fC[a],fP[a]},{a,0,5}]?
Mar
18
answered Null before each element in a list
Mar
15
awarded  Yearling