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awarded  Good Question
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awarded  Popular Question
Nov
27
comment What kind of series / recursion is this?
Thanks for this detailed answer! It really did answer all my questions both in math and with algorithm-theory. Sorry, I wasn't clear with the series in the question, what I've calculated is the following elements of the sum, not the actual values in the recursion. I've update it with +, to make it easier to understand.
Nov
27
revised What kind of series / recursion is this?
added 29 characters in body
Nov
27
comment What kind of series / recursion is this?
You are right! I can apply the Master Theorem, and from it it's clear that e = 0, thus T(n) = Th(n^k). I guess that here n*log2(n) works kind of like an n^k. So I believe that the solution is Th(n lg n).
Nov
27
revised What kind of series / recursion is this?
edited tags
Nov
27
comment What kind of series / recursion is this?
Yes, you're right! But I don't know if I can apply the big-O rules earlier, or just in the last step. I'd guess that for the recursion I cannot apply the big-O rules, since it'd strongly modify the result.
Nov
27
asked What kind of series / recursion is this?
Aug
16
revised How to find a random axis or unit vector in 3D?
edited tags
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13
awarded  Yearling
Oct
25
comment Questions about interpolating translated points from a grid
OK, in the meantime I kind of understood how to solve the problem. It only works with affine transform, not with any random dots. I have to calculate the inverse of the affine transform and then I can do interpolation. I found it explained here: imagemagick.org/Usage/distorts/#mapping
Oct
22
comment Questions about interpolating translated points from a grid
Sorry, I looked up Affine Transformation better, yes, I am only using Affine Tranformations.
Oct
22
asked Questions about interpolating translated points from a grid
Oct
17
accepted Representation of Fourier Transform's vectors
Oct
17
comment Representation of Fourier Transform's vectors
Thanks for the explanation, now it's more clear. I found out that in Mathematica you can set it to work like in "paper", you have to set FourierParameters to 1, 1.
Oct
17
revised Representation of Fourier Transform's vectors
edited title
Oct
17
revised Representation of Fourier Transform's vectors
added 449 characters in body; edited title
Oct
17
asked Representation of Fourier Transform's vectors
Jul
12
comment help with old Mathematica file
Sorry, it tells me an error that "Encountered a gradient that is effectively zero." I've got help here: groups.google.com/d/topic/comp.soft-sys.math.mathematica/… that I should use FindMinimum[z, {t, 0.01, 0, b trif}]. Maybe this is the problem?