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 Yearling
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15h
awarded  Yearling
21h
revised An recurrence equation that can be solved in version 7 but not in version 8
added 6 characters in body; edited tags
21h
comment An recurrence equation that can be solved in version 7 but not in version 8
@Mr.Wizard It's already solved in v9. Well, I remember this has already been mentioned in a comment but it no longer exists, strange…BTW I think it's better to mark this as a "backslide" nowadays :)
21h
revised An recurrence equation that can be solved in version 7 but not in version 8
added 26 characters in body
Jul
18
comment What will happen if I set ExclusionsStyle for points in 2D plot?
@Mr.Wizard I think this story told me that while it's important to be friendly to the new comers, it's equally important to place answers under appropriate questions :D
Jul
18
comment What will happen if I set ExclusionsStyle for points in 2D plot?
So the behavior of ExclusionsStyle is more subtle than I thought. It's worth mentioning that actually there're 8 red points on the graph.
Jul
18
comment What will happen if I set ExclusionsStyle for points in 2D plot?
@Guesswhoitis. Some more analyses added. (A little busy yesterday :) )
Jul
18
revised What will happen if I set ExclusionsStyle for points in 2D plot?
add some more analyses
Jul
17
awarded  Nice Question
Jul
17
awarded  Nice Answer
Jul
17
asked What will happen if I set ExclusionsStyle for points in 2D plot?
Jul
17
answered What will happen if I set ExclusionsStyle for points in 2D plot?
Jul
7
comment Infinite Expression Error NDSolve
Just for curiosity, how is this kind of problem solved in matlab?
Jul
5
comment List of compilable functions
With all due respect, I think the first example given by the engineer is meaningless. Power is in the list of Compile`CompilerFunctions[] !
Jul
5
comment Why Function is compiled?
@Pickett To be honest, I was about to add Function to my answer below that question yesterday, but was confused because I felt it strange that as a frequently used function (I think) inside Compile, no one has ever mentioned Function there hitherto, so I was guessing there might be some deeper reason and asked this question. Well… now that this question gets no answer and 1 downvote, maybe I should delete it and just add Function to the list?
Jul
4
asked Why Function is compiled?
Jun
30
awarded  Nice Question
Jun
23
comment How can I get Mathematica to produce better Fortran code?
Come on, not every one can spend another $2,495.00 without hesitation. BTW, the discount of MathCode for students is really stingy compared to Mathematica: Mathematica student version only sells for 140 dollars (50.00 dollars in China, at least when I bought it), while MathCode sells for $1,095.00 even in education store!
Jun
21
comment Smoothing a unit step function
After a second look I think your question is a little unclear. What do you really want? Smoothen n with NDSolve or find a smooth approximation of n which is to be used in NDSolve?
Jun
21
comment How to use NDSolve with discontinuities at internal boundaries?
@Dr.Know To deal with discontinuities of derivatives, you can try changing the independent variable, for example $f′(0+)/f′(0−)=\lambda$ can be "eliminated" by $ζ=c z$ where $c$ is a piecewise coefficient.