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Apr
9
comment Removing zero values from ordered pairs
@Mr.Wizard Just a sidenote: I'm not sure Equal is the best case for zero-testing, as it does not return a boolean for nonnumeric input. Therefore Equal could pose a problem when e.g. picking out nontrivial solutions of Solve, e.g. Cases[{x -> 0, x -> k - h/r}, _?(Last@# != 0 &)] vs. Cases[{x -> 0, x -> k - h/r}, _?(Not@PossibleZeroQ@Last@# &)].
Apr
9
comment How to control dependent PopupMenus?
@Subbu I've greatly simplified your question: most of it was just styling and sugar. You would get much faster and better answers if you were to put more effort into disassembling your problems to the core. In this case, it could even have been reduced to a two-interrelated-controller problem using the second argument of Dynamic of which here and here are a few answers. (yes I am aware of the date)
Apr
9
answered How to control dependent PopupMenus?
Apr
9
revised How to control dependent PopupMenus?
Rewritten, simplified, cleared up, etc.
Apr
9
awarded  list-manipulation
Apr
8
comment Should Read[] not close its Stream?
ReadList reads the whole content of a file, so it makes sense to close it afterwards, while Read only reads the next entry in the file (be it a number, line, record, whatever). This is by design.
Apr
8
revised Match and replace subexpression
deleted 4 characters in body; edited tags; edited title
Apr
8
reviewed Reviewed Is there any way to force Mathematica to collect a symbol in a polynomial?
Apr
8
revised Is there any way to force Mathematica to collect a symbol in a polynomial?
added 12 characters in body; edited title
Apr
8
revised functions wiki description
added 442 characters in body
Apr
8
suggested approved edit on functions tag wiki
Apr
8
revised Speeding up trigonometric integral
deleted 1 characters in body; edited tags
Apr
8
revised How to find the period of an arbitrary mathematical function?
added 2 characters in body; edited tags; edited title
Apr
8
revised Parentheses in pure functions: # & vs. ( # &)
deleted 4 characters in body; edited tags; edited title
Apr
8
revised How to create a button that colors a selected piece of text in a cell?
added 65 characters in body; edited tags; edited title
Apr
8
comment Removing zero values from ordered pairs
@Mr.W Please see edit. I wonder why MatchQ[0.0000000000000000000, 0.] does not fall back to use SameQ. What exactly MatchQ uses if it is not SameQ in such cases?
Apr
8
revised Removing zero values from ordered pairs
added 766 characters in body
Apr
8
comment Removing zero values from ordered pairs
@Mr.W True that, thanks.
Apr
8
revised Removing zero values from ordered pairs
added 86 characters in body
Apr
8
comment How to create a button that colors a selected piece of text in a cell?
+1, works perfectly in v9.