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visits member for 2 years, 2 months
seen 19 hours ago

Oct
12
revised Printing Block Matrices
added example
Oct
10
asked Printing Block Matrices
Aug
23
accepted Determine whether some expression contains a given symbol
Aug
23
comment Determine whether some expression contains a given symbol
-1? Sure the answer is obvious once you know it, but I spent a very long time looking for an answer, and even longer trying to code my own answer. It's not like FreeQ is a terrible descriptive function name, and it's not listed in the 'Patterns' Guide, or the 'Testing Expressions' guide, or a bunch of other guides that might seem relevant to a newish user.
Aug
23
asked Determine whether some expression contains a given symbol
Aug
19
awarded  Commentator
Aug
19
comment Implementation of builtin function Fold
That's great, thanks!
Aug
19
comment Implementation of builtin function Fold
@NasserM.Abbasi: Sure, but I asked the question because in this case a piece of the internal implementation does matter; if it were done in one way, I would run out of RAM, and if it were done in another, I wouldn't.
Aug
19
accepted Implementation of builtin function Fold
Aug
19
comment Implementation of builtin function Fold
Thanks for the implementation example R.M, but I was more looking for a test than an example.
Aug
19
asked Implementation of builtin function Fold
Jun
22
accepted Outline around sphere
Jun
22
comment Outline around sphere
@jVincent, that looks really good, thanks!
Jun
22
comment Outline around sphere
@J.M., Yeah, I may end up settling for this. There are just a lot of spheres in a 3D array (diamond lattice, actually), and I wouldn't mind something a bit more striking.
Jun
22
asked Outline around sphere
Jun
19
awarded  Nice Question
Jun
18
awarded  Student
Jun
18
accepted The difference between 0. and 0
Jun
18
comment The difference between 0. and 0
@Jens, @Pillsy, thanks. I arbitrarily choose this as the correct answer. I have chosen to add the line F[A___, a_?(Equal[#, 0] &), B___] to be safe: I do not want to cut off at less than 10^-10.
Jun
18
awarded  Editor