Mathematica Weekly Newsletter - Monday, June 30, 2014

Top new questions this week: Fitting points to tilted, off-center ellipse I have 24 x-y points that are supposed to form an ellipse. … plotting equation-solving parametric-equations   asked by seismatica 15 votes answered by ubpdqn 17 votes What is the relationship between Mathematica and Wolfram Desktop? I'm confused about the differences among various Wolfram products. In particular what is the relationship among Mathematica, Mathematica Online, Wolfram Programming Cloud, and Wolfram Desktop? Are … license wolfram-desktop wolfram-programming-cloud mathematica-online   asked by raxacoricofallapatorius 15 votes answered by mfvonh 13 votes How to implement Donald Knuth's up-arrow notation How does one enter very large numbers in up-arrow notation? Up-arrow notation was created by Donald Knuth to write very large numbers in it iterated exponentiation form, for example 6↑↑3 = 6^6^6. custom-notation number-representation   asked by user4401 12 votes answered by Szabolcs 20 votes Combining BarChart and Grid - IPCC style I would like to combine a plot with a table. Something like this famous plot/table from IPCC: So after reading Combining graphics & lists / tables I tried an approach using Grid. Pretty … plotting grid-layouts   asked by gogoolplex 11 votes answered by Öskå 4 votes Is there a way to increase the smoothness of a cylinder? I am using Cylinder to produce wide flat disks (in Mathematica 8). This works just fine except that the circular base of such a cylinder turns out to be really just a 40-gon which is simply too coarse … graphics3d   asked by Burkard Polster 11 votes answered by Mr.Wizard 13 votes Finding maximum or minimum of implicit functions is there any built in function that can be used to find maximum or minimum of implicit functions? For example, if we have the equation $$x^2 + y^2 = (2 x^2 + 2 y^2 - x)^2,$$ then we can visualize the … functions calculus-and-analysis mathematical-optimization   asked by Algohi 7 votes answered by Kuba 13 votes How can I add a column into a existing Dataset? I'm very excited about the brand new Dataset function. I have played with it in Wolfram Cloud, and haven't figured out how can I add a new column into an existing Dataset. Here is an example: … data-structures dataset   asked by Murta 7 votes answered by WReach 12 votes Greatest hits from previous weeks: Even Fibonacci numbers Today, I found the Euler Project. Problem #2 is Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be: 1, … project-euler   asked by Tangshutao 22 votes answered by rcollyer 29 votes Get a "step by step" evaluation in Mathematica Is it possible in Mathematica to get a step-by-step evaluation of some functions; that's to say, outputting not only the result but all the stages that have led to it? Example : Let's say I want to … evaluation interactive   asked by Skydreamer 53 votes answered by Ｊ. Ｍ. 44 votes Can you answer these? Smooth out contour in RegionPlot/ContourPlot I would like to smooth out the jagged edges in the outermost contours in the following plot: I have data of values as a function of variables (x,y) in the form data = … plotting regionplot   asked by Philo 1 vote Processing Collada file I have this [collada file][1]. Answer: Thanks to : Yves Klett http://stackoverflow.com/questions/6246392/importing-google-sketchup-models-in-mathematica graphics graphics3d xml   asked by Being Human 1 vote Bug in PositiveDefiniteMatrixQ? This seems like a bug in PositiveDefiniteMatrixQ to me: m = { { 2, -1}, {-3, 2} }; PositiveDefiniteMatrixQ[m] (* => False *) PositiveDefiniteMatrixQ @ SparseArray[m] (* => True *) This … matrix bugs   asked by Teake Nutma 3 votes

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