# All Questions

39 views

This is a minor point but annoying. I have just upgraded to version 10.0.2.0 and discovered that you must select a bracket before doing Alt+1, or Alt +7 to make a cell a heading or text cell. This was ...
25 views

### How can I improve ContourPlot to get smooth curve?

I am working on the ContourPlot to creat contour line of a InterpolatingFunction recently. This is my data. This is my simple ...
16 views

### Normalize centrality measures

How I can normalise centrality measures? Can I use Normalize function? I give example of unnormalized measures ...
40 views

### Fitting higher order ARIMA models hangs, never completes

I'm working with some data that is 12 month seasonal. However, when I try to fit it to an ARIMA(12,1,3) for instance, my PC's CPU cranks up to 100% and the job never finishes. Here's some sample code. ...
113 views

### How can I use ContourPlot to creat streamline for a free surface domian: proper arrow orientation and correct domain?

I get into trouble when I use ContourPlot to draw streamlines in a free surface flow domain. This is my data.The data are a little bit big, please be patient. ...
48 views

### How to set the width of grid elements in pixels?

That is all: How can I set the width of columns in a Grid in terms of pixels instead of 'ems'? To be more precisely, I want to create a grid that is 330 pixels ...
33 views

### How to export a matrix (Mathematica 8)? [on hold]

I would like to export the object type: { {{"a", "n", "y"}, {"a", "s", "k"}}, {{"b", "y"}}, {{"d", "a", "t", "e"}, {"d", "a", "y"}, {"d", "r", "y"}} } and then ...
101 views

### Plot of Implicit Equations

I've read Cool Graphs of Implicit Equations recently. In the article, it mentioned a software GrafEq which can draw graphs of arbitrary implicit equations. For example, And I've tried several ...
43 views

### Can I define an axiomatic (Boolean algebra) system and prove theorems using Mathematica?

The general question is Can I define an axiomatic system and prove theorems using Mathematica? The more concrete one is about Boolean algebra. I consider this axiomatic Boolean algebra system ...
32 views

### MinorPlanetData position

In versions prior to 10, I can get the heliocentric position of an asteroid with AstronomicalData["Ceres","Position"] and get a simple array of the three ...
25 views

### How can I define a metric in xAct?

I'm using "xAct" package and I want to define a my metric, that is a non standard metric. For example, my metric is diagonal ...
442 views

### Buying a new computer (specifically for Mathematica)

My current computer is a MacBook Air, the mid-2011 version: 4 GB RAM, 1.7 GHz Intel dual core. It runs Mathematica 9 smoothly, but a bit too slowly for my taste. I use Mathematica almost exclusively ...
57 views

### Power[__] Pattern works like Level

I came across this case: ...
63 views

### Design matrix rank does not match

I'm attempting to fit a linear model and Mathematica returns the error message: "The rank of the design matrix 9 is less than the number of terms 10 in the model. The model and results based upon it ...
63 views

### How to check if Integrate solved the integral?

This seems something that must have been asked before, but I am not able to find something. Integrate does not return status nor throw error when it can't find antiderivative. It just returns the ...
92 views

### Specifying and solving a PDE on an L-shaped domain

I wish to solve Laplace's equation with Dirchlet boundary conditions on an L-shaped domain as described here http://www.inf.ethz.ch/personal/tulink/FEM14/Ch1_ElmanSyvesterWathen_Ox05.pdf I know how ...
43 views

### Shifting Columns in an Array Efficiently

I am trying to find a more efficient way to shift the columns of the partitions of an array according to a defined slope and fill in the shifted regions with zeros I have done it below but, I know it ...
12 views

### Remote Kernel configuration works in v9 but not in v10

I have both v9 and v10 currently installed on my computer (Windows 7). For reasons that are not entirely clear, if I create a new remote kernel in one version, it is accessible to the other; however, ...
32 views

### Ordinary Least Squares (OLS) with RLink

I need to calculate the parameters b0, b1 and b2 in: ...
108 views

### Define a Recurrence Table involving other tables

I'm relatively new to using Mathematica. Previously I used Matlab, but lately I noticed that the numbers i got in both of them do not match (mostly it seems that Matlab lacks precision...). The ...
31 views

### Inverse of function including hyperbolic cotangent

How can I create a numeric function for the inverse of $y(z) =\coth{z}-\frac{1}{z}$, over the range of $y\in [0, 1]$ and $z\in [0, \infty]$?
34 views

### What are the differences between these functions when used for NMaximize?

In short, the question is how to construct the function you want to optimize? ...
35 views

### Unit conversion is not simplifying units

I'm running into what looks like an error. ...
31 views

### Multicolumn sorting with ordering functions and precedence

I am aware that the question of "how do I sort on a column" has been asked in various forms, most notably this one. While some powerful solutions have been presented, as far as I can find no one ...
64 views

### Is there any function in Wolfram Mathematica simmilar to fft.fftfreq (Python)

Here is an explanation of fft.fftfreq I have data with random noise: ...
1k views

### Sorting a list with secondary criterion

Is there an easy way to sort a list on multiple levels of criteria? By this I mean, first the list should be sorted according by criteria A (the same as using the usual sort function, ...
364 views

### What is the real default CellEvaluationFunction?

The default CellEvaluationFunction is Identity but one can quickly see that this is handled specially as an equivalent function, ...
167 views

### Understand MeshFunctions with Intercepts

Bug introduced in 7.0.1 or earlier and persisting through 10.0.2 or later While I've been thinking about this question, I tried to visualize the Intercepts. I use three snippets, actually snippet ...
50 views

### How to define a two-variable sequence?

I would like to define the following function but I am having a problem. I would like Mathematica to "understand" what I mean by writing "+...+". For example, for large values for $n$ and $m$ it takes ...
30 views

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393 views

### Computing Many Slow I/O Operations

In working on a custom stock screener, I often need to run mathematica code like this: ...
97 views

### How to execute a notebook in background

I am developing an algorithm that take time to return results. I thought if I could run this notebook in background and continue to develop the rest of my work. It is possible to do that?
29 views

### Align axes in GraphicsGrid - with one rotated figure

I would like to align the axes of the three plots: g3, gPosteriorMarginalMu and gPosteriorMarginalSigma: ...