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 1h answered For a given expression: if it appears, remove it, but if it is absent, add it 4h revised Function for a series of joined slopes edited tags 5h revised How does Mathematica calculate its AdjacencyMatrix[ ] and VertexDegree[ ] edited tags 7h revised Arbitrary precision spline interpolation added 8 characters in body 7h revised What is the best way to write a polynomial in the Bernstein basis? added 2 characters in body 8h comment How to use Table to assign values to variables in a list? Hello Gustavo, you'll want to avoid assigning things to capital letters. That being said, try Scan[(# = RandomInteger[{0, 30}]) &, R]. 8h revised NSolve can not handle a PolyGamma equation edited tags 9h revised Interpolation of a NURBS curve edited tags 9h revised How can I implement the method of Lagrange multipliers to find constrained extrema? edited tags 9h revised Perturbation theory with Mathematica: Definite integral of polynomial times exponential times hypergeometric function of imaginary argument edited tags 10h revised Recursive Euclidean algorithm in Mathematica added 1 character in body; edited title 10h comment Spectral Clustering Looks okay. At first blush, I'd merge two lines myself: Walk = DiagonalMatrix[1/(Total /@ Similarity)].Similarity;. 10h revised Plotting triple data points while xy data are not regular edited tags 15h comment Mathematica's steps towards the result of a definite integral To add an example close to my heart: the usual result of Mathematica's evaluation of an elliptic integral is something that is correct, but somewhat useless (too complicated, involves complex numbers when the result is supposed to be real); on the other hand, someone with sufficient stamina and a copy of Byrd/Friedman close by will likely be able to produce a cleaner elliptic integral expression. So, with things like these, I'm not optimistic about getting Mathematica to show its nasty guts. 15h comment Mathematica's steps towards the result of a definite integral Well, internally, Mathematica uses a heavily modified (and proprietary!) version of the Risch algorithm, expanded to include things like exponential integrals and polylogarithms. That approach will certainly not be the way a human might go about it. I'm not even sure if Mathematica knows things like Landen's identity… 16h comment Does Mathematica have an equivalent of C's nextafter? @kirma, sometimes floating point arithmetic is fun; most of the time, it's a PITA to worry about. ;) 16h comment Mathematica's steps towards the result of a definite integral Maybe you can look at Rubi, but I am not sure that thing knows about zeta functions or polylogarithms, which will more than likely pop up in the evaluation of this integral. 16h awarded Necromancer 16h comment Print all numbers from a sequence which don't contain the digit 7 Thanks for the kindness. :) For now, I must decline; writing on a smartphone is making my thumbs muscular already. I'll save the programming for when I'm using a real computer. :) 16h comment Print all numbers from a sequence which don't contain the digit 7 Nope, my current occupation involves no computers at all; for the past few weeks, I have only been writing from a borrowed smartphone (except for the answers I wrote a few hours ago).