# All Questions

2k views

### Is it possible to do vector calculus in Mathematica?

I am trying to rearrange and manipulate some vector differential equations in Mathematica. As far as I understand you have to tell Mathematica that a variable is a vector by specifying the components ...
278 views

### Summation of If statements

The following made me curious. Suppose you want to sum the if statement If[x[i] < 1., x[i]^2, 0.] over i=1,2, i.e. ...
259 views

### Directional derivative of SiegelTheta

I'm working on a problem where I have to integrate both the Mathematica function SiegelTheta and some of its second order directional derivatives. Using the function works well but something goes ...
530 views

### What is a good way to plot some difficult implicit equations?

Here are several equations, it seems that Mathematica couldn't plot them well, although I set PlotPoints>100 ...
361 views

### Improve performance and style of solution to Project Euler #32

Since I'm fairly new to Mathematica, I'm trying to learn better ways to improve my coding skills so I've turned to Project Euler and this site to speed up my learning pace. Anyways, I was trying to ...
278 views

### Create heat map from RMSD values

After looking through these forums for answers that could work for my problem, I could not find anything. I want to make a heat map comparing values that are in a nested list. That is, I have a ...
1k views

### How can I make a plot of the Higgs potential?

I was wondering, how would could I make a drawing of the Higgs potential aka "mexican hat potential". I am quite new to Mathematica and don't know where to look to learn how to implement such a ...
3k views

### What are the possible ways of visualizing a 4D function in Mathematica?

I have a function $F$ that maps the xyz space to a set of reals, more clearly: $c = F[x,y,z]$ Where $c$,$x$,$y$ and $z$ are reals. What are the possible ways of visualizing this 3d function in ...
137 views

### Get DownValues that do not involve patterns?

Say I have a function with a few definitions that also implements memoization: f[x_] := f[x] = x^2 f[x_, y_] := f[x, y] = x^2 + y^2 I then apply the function to ...
432 views

### Best way to modify values in a list of rules?

Recently I had to solve a problem similar to this: Let's say I have a list of list of rules ...
171 views

### Evaluation order of Button[]'s action

it looks like it should be well known issue but I haven't found answer anywhere. Please tell me why the result (after clicking) of this: ...
381 views

### Why use Column with Rows instead of Grid?

In general, what are the advantages of using Grid versus a combination of Column and Row? Is Grid better in some situations but not others? For example, is there any reason why one would do this: ...
550 views

### How to label the Vertex and, or Edge labels with their weight

I noticed that the Mathematica 9.0 documentation only mentions the usage of "Name" to label the vertexlabel or edgelabel in the Graph. Is there an option to use the Weights automatically just as ...
245 views

### Forming Cone with Tube fails to work in version 9.0.1

I use two different radii in a Tube expression to draw a cone. I know for a fact that this worked in Mathematica 8, but when I reevaluated my code in versio 9.0.1 ...
3k views

### Image processing: Floor plan - detecting rooms' borders (area) and room names' texts

Here is a simple building floor plan. I would like to derive the rooms as (rectangular) components and the names of the rooms. This is very common representation of building floor plans. The ...
2k views

### Compare C++ Standard Library's Mersenne Twister with Mathematica's Mersenne Twister

The C++ standard library does contain a set of random distribution classes, among other things a Mersenne Twister engine. What I'd like to do is to generate the same random number distribution, using ...
80 views

### Plot axes invisible when projected

When I save plots made in Mathematica in PDF format and then insert them in a presentation (e.g., in Powerpoint), the plot axes are invisible in the picture created by the projector. Is there a way to ...
707 views

### How to clear parts of a memoized function?

I have a function of two variables, e.g.: f[a_, b_] := f[a, b] = something f[a - 1, b - 1] etc With the above code I used the concept of memoization to speed up ...
216 views

### Is there a way to teach integrate new solutions?

I have an integral which I can solve, but integrate cannot: ...
144 views

### An issue with formulas typesetting in Grid & Column

I tried to construct a small sheet with text and equations presented in a convenient publishing form, using Column: ...
236 views

### How do I get a list of allowed values for an option?

When using Mathematica how can I get a list of the allowed values of an option? As an example I can use the Options command as follows - ...
249 views

### EventHandler {“MouseDown”, 1} with PassEventsDown -> True not working as expected

I want my EventHandler to respond only to left mouse clicks and pass the right mouse click to the built in event handler. I have tried ...
633 views

### How to play microtonal music using Mathematica?

I am trying to model microtonal music using Play. I have only partial success because it takes such a long time to make some sound. Could you please have a look ...
347 views

### Integrating hat functions

I am trying to integrate a hat function for a project that I am doing and have found a method to do so but I find it sloppy. Currently I have the basis function ...
271 views

### How can I get WhenEvent to recognize criterion I specify?

Using NDSolve I want to solve a differential equation till a quantity which is a function of the dependent variables reaches a certain value. My functions and criteria are complicated, but I am able ...
393 views

### Can I customize a TradingChart?

What I would like to do is generate a chart similar to the TradingChart but to have two lines on it instead of the candlestick. The lines I want to plot will look something like this; And what I ...
815 views

### Load a Mathematica Package via .Net code

I'm using C# to pass data to Mathematica and return graphs: ...
921 views

### Exporting interpolating functions to excel

I have a question about exporting an InterpolatingFunction to excel. I checked the forum, but I still couldn't completely understand how to solve my problem. Could someone help me with this problem? ...
495 views

### Projecting image or contour plot on xy-plane of Histogram3D? [duplicate]

I've generated a simple 3D histogram, where the x-y coordinates corresponding to the "location" of an event defined on a simple 160x160 grid, and the z-axis height is simply the count of events that ...
521 views

### How do I solve N simultaneous equations for N variables?

I have a function: f[x_] := x + 31 x^3 + 5 x^25 Which I want to find an expansion for: ...
506 views

### Function argument to default under certain condition

Inspired by this and this question (and how I handle this in practice), what is the best way to default a function value when a certain condition is met? For example, if a function is defined as: ...
188 views

### Integer partitions in all orderings

I want to partition an integer into $k$ integers all possible orderings. This can be done in the following way ...
113 views

### Strange behaviour of variables in Table

I'm trying to work with some vectors and have run into a strange problem. An obvious way to define a difference of two vectors would be dif[x_,y_] := x-y I ...
388 views

### Finding all points of period n in an iterated map

I'm trying to implement an algorithm of Jenkinson and Pollicott to calculate the Hausdorff dimension of a Julia set for the map $f_c : z\mapsto z^2 + c$. It's described on page 40 of their paper, ...
430 views

### Exporting 2D graphics to DXF

I have a design that I've produced in Mathematica, consisting of two sets of Rectangle objects. The second set is a mirror image of the first and was produced with ...
74 views

### Accessing files in different directories [duplicate]

I have a problem that I am trying to work on. My Folder structure is like this. Application(MainDirectory) AppData( Secondary directory where files are Design.m, Layout.m, and Evaluation.m) ...
86 views

### Get unique values for integration limits

For an multidimensional integration I want to build up the integration limits with the following code. (the length of vars is also variable) ...
470 views

### Why is Mathematica limiting the execution time of my calculation? [duplicate]

Is there a Front End option (or programming option) in Mathematica 9 that limits the amount of time that functions take to execute? I have a function (as part of a Mathematica Application) that shows ...
573 views

### Styling individual bars in a BarChart with grouped data

Consider the following: ...
423 views

### How can I decimal-align tick labels at the left?

I use the CustomTicks package, because the built-in tick labeling leaves a lot to be desired. Even just putting the tick marks on the right instead of the left is ...
412 views

### Symbolic derivative of $n$-term product

I want to determine the relationship that must exist between the $x_i$ and $y_i$ such that $$\frac{\partial}{\partial\theta} \prod_{i=1}^n \frac{f(x_i,\theta)}{f(y_i,\theta)} = 0,$$ where  ...
1k views

### Finding the likeliest path in a Markov process

With Mathematica 9, we have the addition of various processes, among which the discrete Markov process. Given a transition probability matrix m, such a process is ...
170 views

### Cell output controlled by CellFrameLabel Checkbox?

The following generates a Cell that returns the state of the checkbox when evaluated: ...
499 views

### Behavior of expression evaluation in Plot

I'm confused with Mathematica's way of parsing expressions. I've been struggling with this for a while and never found an exhaustive answer, sometimes things don't parse the way I think they would ...
848 views

### Passing large list by reference

I have the following problem: I would like to control evaluation of a variable that points to a list. For example, frequently in the code I have functions of the form that are supposed to work on ...
291 views

### Is there a way to programmatically set global preferences?

Can I set global preferences that are accessible via "Edit"->"Preferences" programmatically from within a notebook? As learned from this question, turning off anti-aliasing can make a huge difference ...
337 views

### Why do Mathematica and MathKernel need “incoming connections”?

My firewall (the "Application Firewall" in OS X 10.8.2) detects that Mathematica (9.0.1.0) and "MathKernel" both request incoming connections. My configuration expects all incoming connections to be ...
570 views

### Find Roots in Do loop

Task: Finding roots in loop t = List[1, 2, 3, 4, 5] fx[x_] := a*x^2 - 5 List[Do[Print[FindRoot[fx[k] == 1, {a, 1}]], {k, 0, 5}]] Output: Currently the output is ...