# All Questions

264 views

### solve a stochastic partial differential equation [on hold]

Every example about solving a stochastic differential equation uses an ordinary differential equation (derivatives with respect to one variable), but ¿what about solving this when de function depends ...
23 views

I decided to give the SocialMediaData functionality of MMA10 a try but it does not seem to work for Twitter. The first time I call ...
64 views

### How to solve two non-linear equations in two variables [on hold]

I am a new user of Mathematica. I have the following non-linear equations in two variables: How can I solve this system with Mathematica?
112 views

### Fitting numerical model to experimental data

I have diffusion equation with the initial/boundary conditions: ...
135 views

### Plot a one-dimensional list of numbers as a column/row of labeled colored squares

I have a list of numbers and a matching list of labels. I want to plot a column of colored squares, with the color of each square matching (in some color scale) the value of the corresponding number. ...
90 views

### How determine The most possibility probable with programming

i have a scatter chart of probable of happen some thing like below chart link of google chart i what determine the probable The most point in below chart , can use a mathematic method to determine ...
66 views

### How to put the tensor product of two operators onto two variables?

I am trying to make an intuitive Mathemtaica program to show the principle of quantum walking. The idea of quantum walking is very simple and direct, but when I try to transfer it into Mathemitca ...
57 views

### How to implement something like NMaximize[ NMinimize [ f(x,y) , {x} ], {y} ]?

Title says it all, really. I want to find some set of values for which a function of those values can't be made larger than a certain number, when some other values (on which that function is also ...
110 views

### Passing a variable messages list to Quiet

I'm trying to build a Verbose option into some code but I'm having trouble passing to a Quiet statement a variable list of which messages I want to suppress. My ...
62 views

### GroupBy Dataset on two keys

I would like to group the elements of row c of the following dataset according to the values in the columns a and b. Go from here To here ...
270 views

### A topoplot function for Mathematica

Matlab's EEGlab toolbox has a topoplot function: http://sccn.ucsd.edu/eeglab/ A typical topographical plot of an EEG signal is given below: How can I reproduce this in Mathematica. I know that ...
32 views

### “There are no symbols matching \”\!$$\“Global*\”$$\“” [on hold]

"There are no symbols matching \"!(\"Global*\")\"" what's the probleme with this error and how to solve it?
196 views

### How to create a stacked-alphabet image efficiently?

By adopting the answers from Mr. Wizard to my previous question, I tried to create a stacked-alphabet image from a person's portrait, the alphabets were taken from the name of the portrait subject. ...
28 views

### Is “MaxMessageCount” broken or is its function counter-intuitive?

As noted by kguler the Front End option: MessageOptions -> "MaxMessageCount" does not appear to have any affect on the number of times a Message is repeated ...
81 views

### When exporting text, how can I set the line separator?

I want to export a string for a bash script. The terminal is naturally very picky when it comes down to the "\n\r" vs "\n", Windows vs. Linux, new line issue. How can I teach Mathematica to use "\n" ...
183 views

### How to create a 'shortest-path link matrix'?

I am currently struggling with a problem in Mathematica. I have a randomly generated weighted Barabasi-Albert graph and a corresponding demand matrix of the same size. I'm generating the graph with ...
40 views

### How to deal with matrices involved in system of SDEs?

This question is in continuation of the the previous posts Solving Stochastic differential equation and Fast Simulations with Compile. What I want to do is numerically solving the epidemic model which ...
63 views

### Animating a 2D Plot as a 3D Plot

This is a follow up question to the original question: Original Question The accepted solution (provided by @Mark McClure) can also be found in the original question. It is as follows. ...
140 views

### Numerical Integration with Variable Parameters

So I want to numerically compute the integral of a long complicated expression over a specified domain (in this case an ellipse). I know how to use a Boole function to sample within the ellipse, but I ...
56 views

### After editing a file Mathematica 10 interprets […]^2 as […(])^2

This is a very weird bug and I don't really know how to reproduce it, so I'll just copy-paste the whole code ...
19 views

### Disable alert message with internet connectivity off

I work in an environment that has mathematica's internet connectivity turned off under Help > Internet Connectivity. Recently, after installing mathematica 10.0, every time mathematica is loaded it ...
55 views

When I enter ...
102 views

### Plotting a Partially Filled Ellipse

I would like to plot a partially filled/shaded ellipse. The code below shades the whole ellipse. However, I only want to shade the part of the ellipse to the right of the vertical line where x > ...
24 views

### What are the upper bound and stability conditions for the following simple linear system [migrated]

Consider the following linear system $$\dot{x}=\sum\limits_{i=1}^{m}{{{\alpha }_{i}}}\left( t \right)\cdot {{A}_{i}}\cdot x \quad (1)$$ where, $x\in {{\mathbb{R}}^{n}}$ represents the state vector, ...
86 views

### Finding a root of a parameterized integral

I have a function given as a parameterized definite integral: f[a_] := Integrate[BesselJ[0, x - a] BesselJ[0, x + a], {x, -∞, ∞}] I suspect it has a root near ...
304 views

### Splitting strings at lower case characters and numbers

I'm trying to split the strings of chemicals into their elements and numbers. See this example "Fe3O4" will be split into ...
46 views

### How to convert a sparsearray to a graph?

s = Import["hello.mat"]; t = GraphEmbedding[Graph[s[[1]]], "GridEmbedding"]; I get the following error: GraphEmbedding::graph: A graph object is expected ...
176 views

### Converting structured data to a dataset

A Dataset seems perfect to represent structured data. Has anyone already thought about how to convert as efficiently/elegantly as possible an XML or JSON file to a Dataset in Mathematica 10 ?
168 views

### Plotting a region with polar axes

I want to plot the region of points who satisfy the following equation: 2 < r <= 5 && 3/4 π < θ <= 5/4 π I have been able to plot region in ...
33 views

### Speeding up ReplaceRepeated while truncating to desired order

I need to program in an algorithm that recursively makes algebraic replacements which leads to an utterly complicated algebraic function of $x$, but whose final result is only needed at fixed order in ...
40 views

### Bug when using Plot3D over an ImplicitRegion?

Evaluating this expression seems to cause Mathematica to beep and quit the kernel: ...
114 views

49 views

### InterplationOrder, ListPlot3D and using AbsoluteOption to find value used. Slow using InterpolationOrder

What lead to this, is when I noticed that ListPlot3D was much slower when adding a specific InterpolationOrder->n vs. not and ...
26 views

### NonlinearModelFit::nrlnum error using FindFit /NonlinearModelFit

My question is related to my previous post I'm trying to fit experimental data (after suggestion here by David) with Airy type function `data01 = Import["366.0000cm_660.0000nm.png"]; data02 = ...