================================== Top new questions this week: ==================================
[Exponential fitting - isn’t actually a BUG there?] http://mathematica.stackexchange.com/questions/105002/exponential-fitting-isnt-actually-a-bug-there
There are many questions on this site about wrong exponential fitting in Mathematica but no one considers this well-known problem as a potential bug. Usually people suggest well-known workarounds ...
- asked by Alexey Popkov (20 votes), answered by Sjoerd C. de Vries (6 votes)
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[Detecting components in timeseries] http://mathematica.stackexchange.com/questions/104950/detecting-components-in-timeseries
I’m looking at this sequence of values:
I’d like to detect the points where the center of the time-series shifts (around x=1000 and x=2000). Many of the transforms and smoothing methods I have ...
- asked by M.R. (17 votes), answered by blochwave (22 votes)
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[Generating Tuples with restrictions] http://mathematica.stackexchange.com/questions/105139/generating-tuples-with-restrictions
I am interested in a certain subset of all tuples. Generating all with Tuples and then filtering is wasteful, and will "blow up" very quickly.
For a concrete example, let’s say I want to find all ...
- asked by Kiro (13 votes), answered by Kuba (12 votes)
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[Grid cuts my images] http://mathematica.stackexchange.com/questions/105061/grid-cuts-my-images
Bug introduced in V9.0 or earlier
and persisting through V10.3.1 or later
pic2 = ImageResize[ ImageCrop@Rasterize@Graphics@Disk[], {Automatic, 40}] Grid[{{pic2}}]
This is just ...
- asked by Kuba (11 votes), answered by Coolwater (7 votes)
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[Non Standard Eigenfunction Plots of the Laplacian Over the Unit Square] http://mathematica.stackexchange.com/questions/105264/non-standard-eigenfunction-plots-of-the-laplacian-over-the-unit-square
I have recently been plotting eigenfunctions of the laplacian over the unit square using the NDEigensystem command. However, I have noticed something in the plots which puzzles me.
Below is an image ...
- asked by Mr S 100 (11 votes), answered by Jens (12 votes)
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[How to count the number of the tube] http://mathematica.stackexchange.com/questions/105229/how-to-count-the-number-of-the-tube
There is a picture Get the binary image
binimg = ColorSeparate[img][[2]] // Binarize[#, 0.25] & // Thinning Visulize the result of regconization lines = ImageLines[binimg, 0.074]; ...
- asked by yode (11 votes), answered by nikie (7 votes)
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[Detecting X or O in a small image] http://mathematica.stackexchange.com/questions/105327/detecting-x-or-o-in-a-small-image
I am making a robot that plays Tic Tac Toe
Currently, I have code that will parse the board and separate it into an array of 9 images, each space on the board. How can I detect if the image ...
- asked by Jenny (10 votes), answered by John Conor Cosnett (17 votes)
================================== Greatest hits from previous weeks: ==================================
[Is there a syntax for single-line comments for notebooks?] http://mathematica.stackexchange.com/questions/1496/is-there-a-syntax-for-single-line-comments-for-notebooks
I’m aware that I can use (* ... *) to comment out stuff in a notebook. Many languages have a syntax for single-line comments, such as
// in C, C++, Java, C#, ... # in shell, Python, ...
For ...
- asked by Peeter Joot (37 votes), answered by Szabolcs (43 votes)
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[Advice for Mathematica as Mathematician’s Aid] http://mathematica.stackexchange.com/questions/92686/advice-for-mathematica-as-mathematicians-aid
I use Mathematica mainly as an aid in symbolic attacks on problems, usually intermediate or harder and often number theoretic. While Reduce, Simplify, et al. are remarkably powerful, they of course ...
- asked by CarlEdman (56 votes), answered by MarcoB (39 votes)
================================== Can you answer these? ==================================
[What are the time and space complexities of Classify/Predict?] http://mathematica.stackexchange.com/questions/105366/what-are-the-time-and-space-complexities-of-classify-predict
Does anyone have knowledge of the O(n) time and space complexities for various model types supported by Classify[] and Predict[] during training and evaluation?
Here are a list of supported model ...
- asked by M.R. (4 votes)
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[Finding eigenvalues in Mathematica: why so slow?] http://mathematica.stackexchange.com/questions/105224/finding-eigenvalues-in-mathematica-why-so-slow
I am trying to find the eigensystem of a large sparse real symmetric matrix, and I only need the lowest 40 or so eigenstates. The relevant code is as follows:
TheModel[V0_, V1_, V2_, index_, ...
- asked by Xiao (3 votes)
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[Notebook created in cloud has odd errors in Mathematica 10.3.1] http://mathematica.stackexchange.com/questions/105019/notebook-created-in-cloud-has-odd-errors-in-mathematica-10-3-1
I’ve downloaded a notebook from develop.wolframcloud.com and opened it in 10.3.1 (running on Win 10). When I evaluate some cells I get syntax errors along the lines of...
Syntax::sntxf: "\"Clear[\" ...
- asked by Ymareth (2 votes)