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Jul
30
answered Is there a quick way to find a built-in function by name search?
Jul
29
comment What is the difference between Set and SetDelayed?
@Mr.Wizard formal symbols it is, then :) in fact I was not familiar with these so thanks for pointing it out (I had seen you use them but had chalked it down to general perversity on your part)
Jul
29
revised What is the difference between Set and SetDelayed?
added 137 characters in body
Jul
29
comment What is the difference between Set and SetDelayed?
@Mr.Wizard I added a mention in the pitfalls (as it is indeed a likely tripping point).
Jul
29
revised What is the difference between Set and SetDelayed?
added 446 characters in body
Jul
29
comment What is the difference between Set and SetDelayed?
@Mr.Wizard I was explicitly trying to reduce complexity. As I mentioned nothing about localizing the symbols on the rhs earlier, I do not see how it is consistent to do it in the final section (as you know perfectly well x = 5; y[x_] = Sin[x] is a dangerous thing to do). But, you are correct: I should point out that the rhs is not localized.
Jul
29
revised What is the difference between Set and SetDelayed?
added 2024 characters in body
Jul
29
revised What is the difference between Set and SetDelayed?
added link to tutorial, added Set and SetDelayed names
Jul
29
comment What is the difference between Set and SetDelayed?
@FaysalAberkane I am not sure I understood, but y[x_]=Sin[x] re-evaluates (say) Sin[5.] no matter how many times you say y[5.]. It doesn't cache values at all in this sense, while y[x_]:=y[x]=Sin[x] remembers that y[5.] is whatever it is (ie it only evaluates Sin[5.] once).
Jul
29
revised What is the difference between Set and SetDelayed?
added 290 characters in body
Jul
29
comment What is the difference between Set and SetDelayed?
@Mr.Wizard good point, will fix it
Jul
29
answered What is the difference between Set and SetDelayed?
Jul
28
comment Image Processing: Isolating areas of an image with internal irregularity
Both belisarius and Vitaliy have answered your original question; if you feel they haven't, please try to clarify why. Your update is a different question (and probably way too general; is the white balance going to be correct? the colour of the nails always the same? their size always constant?). it's underspecified
Jul
28
comment Find subexpression to minimize leafcount after replacment with temporary variable
you could also use Experimental`OptimizeExpression[$expr]
Jul
27
comment Efficient Langevin Equation Solver
@Gabriel I suppose it can be guessed by analogy to Kibble-Zurek type arguments (well, they don't really apply since there's not actual transition, but maybe one could estimate the domain size like this--but maybe not).
Jul
27
comment Efficient Langevin Equation Solver
if I start at a high temperature and decrease it at a fixed rate, can I predict the characteristic size of the domains? is it related to the rate?
Jul
27
comment Efficient Langevin Equation Solver
@LeonidShifrin Yes, I think you pointed this out to me once before. I find it more readable though (small brain) so I'll leave it. thanks
Jul
26
comment Efficient Langevin Equation Solver
You mention that "A follow up would be to extend all this to systems of Langevin equations". What would you like that to look like? Clearly you know that you could just use vectors to obtain a solution for a single realization of the noise in the same way you are doing it now. What more would you want? To do it for many realizations with a single NestList?
Jul
26
revised Efficient Langevin Equation Solver
added 1255 characters in body
Jul
26
revised Efficient Langevin Equation Solver
added 80 characters in body; added 110 characters in body