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2d
revised Returning multiple results from a LibraryLink function
added 781 characters in body
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awarded  Nice Answer
2d
comment Why are some option values symbols, other strings?
@flip I haven't noticed that, but it's great news. Can you give an example?
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comment ArrayPlot: colours depend on image size?
I cannot reproduce the problem either with 10.2.0 OS X or 10.2.0 Linux (Ubuntu 15.04 in a VirtualBox).
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comment Replacing the Slot in an expression
Root does work even if the first argument is not a real function though. This works: N@Root[13 - #1^4 + #1^5, 1] (note there's no &!). And even this works: N@Root[13 - x^4 + x^5, 1]. These forms are undocumented and probably a bad idea, but I've seen them used a few times on online forums like this one. Maybe this has contributed to the confusion.
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comment LineLegend behaves differently in ListPlot in Mathematica Version10.0 or later
@Harry I have 10.0.2 installed and the date of December 4, 2014 (in $Version) matches with yours. If yours showed an earlier date, I couldn't tell if it was 10.0.0 or 10.0.1 as I don't have those versions any more.
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comment LineLegend behaves differently in ListPlot in Mathematica Version10.0 or later
@Harry You're right, see update.
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revised LineLegend behaves differently in ListPlot in Mathematica Version10.0 or later
added 500 characters in body
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comment LineLegend behaves differently in ListPlot in Mathematica Version10.0 or later
To check version, use Help -> About in the GUI or use both $Version and $ReleaseNumber. Unfortunately $Version and $VersionNumber will not contain the z part of an x.y.z form version number.
2d
revised LineLegend behaves differently in ListPlot in Mathematica Version10.0 or later
deleted 84 characters in body
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revised LineLegend behaves differently in ListPlot in Mathematica Version10.0 or later
added 210 characters in body
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answered LineLegend behaves differently in ListPlot in Mathematica Version10.0 or later
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comment Mixing Text and Formulas
And this is a 2 yr old question. I didn't realize that.
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comment Mixing Text and Formulas
This works for me: Alt+7, This is some text Ctrl-9 x RightArrow. On my keyboard layout Ctrl-9 creates an inline cell where I can type traditional form formulae. Pressing the right arrow key on the keyboard exists this inline cell. On non-English keyboard layouts the shortcut might be different. Go to Insert -> Typesetting and check what keyboard shortcut is listed next to "Start Inline Cell", or just use the menu item.
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comment Suppress Print[ ]s?
@JosephO'Rourke Block[{sym}, expr] evaluates expr with the definition of sym temporarily removed. This works even if sym is a builtin like Print. Block[{Print}, ...] makes Print behave like any undefined symbol while the body of the Block is evaluated.
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revised Suppress Print[ ]s?
added 333 characters in body
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comment Suppress Print[ ]s?
I think I first saw this style used by Brett Champion.
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answered Suppress Print[ ]s?
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revised Create a sum with the Do function and modules
added 12 characters in body
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answered Mathematica 10, Show, and PlotRange