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May
31
answered Remove singularity at zero from $-((i^{-n} (-1 + i^n)^2)/(n^2 π^2))$
May
30
comment FindRoot for numerical function and how to search more than one root
By numerically looking for zero crossings of the ArcTan, you will get spurious results that don't correspond to zeros of the function, whenever the ArcTan goes to infinity and flips sign. I think you should look for zeros of the sine, which means replacing your definition f[T0_?NumericQ] := ArcTan @@ by Chop@Last@First@.
May
30
answered Adding plot legends in version 8
May
30
comment Adding plot legends in version 8
@tangshutao Glad you like it - I added the tag for version 8 to this question to make it clearer that you can't solve it by using version 9 commands.
May
30
revised Adding plot legends in version 8
Added version tag because solutions based on 9 won't work here.
May
30
comment Adding plot legends in version 8
It also works if you use the autoLegend function defined in the first code block of my answer here and write the Column like this: Column[{Show[autoLegend[Show[{JointDisplacement, JointVelocity, JointAccelaration}, AxesLabel -> {Style["t(s)", 15], ""}, AxesStyle -> Arrowheads[.04], PlotRange -> plotRange, GridLines -> {None, Automatic}], {"displacement", "velocity", "acceleration"}], ImageSize -> 450], opt}]
May
29
reviewed Approve How to simulate the true reflective movement of a particle bouncing around in an ellipse?
May
29
reviewed Approve Intersecting/Overlapping Image Elements Counts?
May
29
reviewed Close How can I get the time steps chosen by NDSolve when the Method -> “ExplicitRungeKutta” option is given?
May
29
comment How to make a smooth revolution surface plot
Why is it so important to avoid the small deviation between the actual data and approximate surface?
May
29
comment Having trouble saving a plot with legends
To get a contextual menu allowing you to save the entire contents of a cell, right-click the cell bracket on the right of the output. Then choose Save Selection As... In your case, this will save the graphic and legend together.
May
28
awarded  Enlightened
May
28
awarded  Nice Answer
May
28
answered Binarize turning image completely black?
May
28
comment How to flip texture?
Oh, it could (though very unlikely) be that you set some obsolete options like LightSources in some init.m file and they could still be affecting the assumed position of the Lighting. Not sure about that, but you could experiment by trying some of the more explicitly specified settings from the documentation for Lighting and see if the results look like the pictures in the examples...
May
28
comment How to flip texture?
@Sigur That's a bit mysterious, but if the standard steps of restarting the Kernel and copying verbatim from the answer don't help, then it must be a version-dependent problem. Anyway, I hope the Glow method will help avoid this issue.
May
28
comment How to flip texture?
It's true, I get the darker appearance in the bottom view, not the top view, when no Glow is added. I'm using Mathematica version 8, what are you using?
May
28
answered How to flip texture?
May
27
reviewed Close How to use results of Dsolve and get derivative of that?
May
27
reviewed Close Creating new functions using the names of existing ones