Description:
Mathematica discussion group. (Moderated)
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I broke the sum into pieces
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...Alexander Povolotsky, No I haven't reported this. Since the Mathematica guys ( Trott and Wolfram himself) put up my Beta cube fractal without giving me any credit for it, they are on my list, ha, ha... In trying to get a 5th term I tried: $MaxExtraPrecision = 200 b[5] = Sum[(1/(64^n))*(1/(32*n + 3*1097)), {n, 0, Infinity}];... more »
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Clustering algorithm Mathematica 7
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Hi all, Currently, I'm using the built-in clustering algorithm of Mathematica 7, though it isn't clear for me which algorithm it actually is since this is not mentioned in the extended help pages. Presumably, it's the normal K-means clustering but I'm not sure. As such, I'd like know whether someone knows which implementation is... more »
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Mathematica 7.0 - Wrong Documentation on StudentTCI
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Hi all, Summary: StudentTCI function's second parameter expects standard error, rather than standard deviation as stated in the document. The document has an error. I just want to report an error in the documentation of StudentTCI function in Mathematica 7.0. The document for StudentTCI function reads... more »
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PolarPlot goes upto 1.2 on axis, not 1?
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Hi guys, I am trying to polarplot a function like Sin[2 x]^2, from -Pi/2 to Pi/ 2, with polar ticks and gridlines enabled. Every time I do this, the vertical axis goes up to 1.2, not 1 --- is there any way to have this only go upto 1? (The function I'm plotting goes upto 1 only.) Cheers!
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MatchQ, silly question
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MatchQ[3 x^2, #] & /@ {3 x_^2, 3 x_^_, _ x_^_, _ _^_, _ (_^_), _ * (_^_)} dives False in the last cases. Why? The FullForm Power[Blank[ ],Plus[1,Blank[ ]]] contains Plus, why? Thank you. J=E1nos
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Setting global InputAutoReplacements
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Dear Mathgroup, I am trying to create a few custom InputAutoReplacements that would apply to all input cells by default. I am trying to follow John Fultz's instructions on [link], but running into difficulties: the style for the input cell seems to... more »
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Help with algorithm to find rational roots of a bivariate equation?
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Hello all, Does anyone know an efficient algorithm using Mathematica that can find _rational_ roots of a non-homogenous eqn in two variables with deg > 4? For ex, you want to find rational {x,y} such that, F(x,y) = x^n + (P_1)x^(n-1) + (P_2)x^(n-2) + .... = 0 where the P_i are polynomials in y. I _always_ come across this situation in the course of experimental... more »
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More Efficient Method
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I have a couple of functions designed to poke a single hole, and to poke multiple holes, in a one-level list: We define a function which, given the imported pressure data, finds the subset of that pressure data excluding the pressure data points between "targetL " and "targetU". In[5]:= findsubset[data_?VectorQ,targe tL_?NumericQ,targetU_?... more »
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Solve and the order of variables to solve for (v7.0)
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Hi, consider the following problem: costsHome[yh_, yht_] := w (yh^2 + 10/100 yh yht + 110/100 yht^2); costsFor[yf_, yft_] := wt (110/100 yf^2 + 10/100 yf yft + yft^2); profitHome[\[Epsilon]_, pht_, ph_] := \[Epsilon] pht yht + ph yh - costsHome[yh, yht]; profitFor[\[Epsilon]_, pf_, pft_] := 1/\[Epsilon] pf yf + pft yft - costsFor[yf, yft];... more »
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