# All Questions

242 views

### Is this a bug in NIntegrate?

Fixed in 10.1 Bug is present as of version 10.0.2 checked on windows 7, 64 bit Is this a bug or I missed something? NIntegrate seems to give a different ...
200 views

### Finding real roots for an eigth-degree polynomial

The context for this problem is identical to my first question. Unfortunately my previous result for $L$ was inexact since it was a relatively simple approximation. This time I have managed to produce ...
120 views

### Pulling powers to the outside of expressions (inverting PowerExpand)

Is there something like an inverse of PowerExpand that pulls powers to the outside of expressions: $$x^2 y^2 \leadsto (x y)^2 \\ x^2/y^2 \leadsto (x/y)^2$$ I ...
205 views

### Pick with nested list

I have a list of pairs of values. Some of those pairs are invalid based on another list. I would like to select only the valid pairs. ...
51 views

213 views

### Efficient Dyson series implementation

I'm trying to implement a Dyson series \begin{array}{lcl} U(x,x_0) & = & 1 + \int_{x_0}^{x}{dy_1V(y_1)}+\int_{x_0}^x{dy_1\int_{x_0}^{y_1}{dy_2V(y_1)V(y_2)}}+\cdots \\ & &{} + ...
595 views

### Find intersecting rectangles groups

I've a list of rectangles in the form {index, {centerX, centerY}, {width, height}} I want to find intersecting rectangles list. I want to obtain a list on the ...
94 views

### Faster way to extract partial data from AdjacencyMatrix

I am dealing with a lot of Graph objects. One task is to obtain an Id for each of them. So I first used ...
97 views

### Known restrictions for WolframAlpha in CDF Player and PlayerPro

Are there any known (documented?) restrictions for the use of the WolframAlpha function in CDF-Player and PlayerPro? I only found this answer which mentions upper values for various license version, ...
323 views

### Why does Mathematica not give simple solutions to simple system of equations with powers

I trt to get Mathematica getting me the simple solutions for x and y from this system of two power equations: $$\text{Eq. 1: } z=x^{m}y^{n}$$ $$\text{Eq. 2: }z=\tau x^{m-1}y^{1-n},$$ The simple ...
240 views

### How to understand the process of ListCorrelate when it in two-dimensional condition?

Toady,I learn a function ListCorrelate,and I can understand process of execution his result in one-dimensional. However,the ...
222 views

### Get domain for a given function (including e.g. singularities)

I am new to Mathematica and this is probably a simple question, but I can't figure it out at the moment... f[x_]:=1/(x-3) Clearly the vertical asymptote is at ...
94 views

### How to obtain a complete list of WordData's “Properties”?

Command WordData["Word", "Properties"] seems to return an endless list of properties, such as: "Definitions", ...
132 views

### LogLikelihood function with Multivariate State Space Models

I load the packadge TimeSeries. Depending on the running Mathematica release, one should preliminary remove some built-in function with the same name, e.g.KalmanFilter, I used the following commands: ...
122 views

### How to make functions from datasets

I have a csv that encodes the results of plugging certain parameters (say, A and B) into certain functions (say, ...
84 views

### Mathematica 10 loads too long time [duplicate]

After starting Mathematica 10 it hangs for about a minute before becoming operational. Internet connectivity is disabled. Start screen is disabled. What should I do? P.S. Opening any help page ...
214 views

### Why does Mathematica not simplify this expression?

Consider this simple example: ...
327 views

### ContourPlot is slow and unwieldy and generates a large-data graphic

I'm constructing a single contour showing the points in a plane that satisfy a function. The general form is ContourPlot[f[x, y] == 0, {x, 0, .5}, {y, 0.2, .5}] ...
72 views

### Manipulating lists with uneven amounts of entries

So I have a list like so list={{a},{b,c},{d,e,f},{g,h}} and the basic logic I want is to be able to manipulate each of the nested lists individually. So If I ...
173 views

### Double helices inside an ellipsoidal cavity

This question may be related to a previous query at Plotting a contour on a torus My question is how do you enclose double helix structures (see demonstrations.wolfram.com/DoubleHelix ) inside an ...
153 views

I stumbled (here, in the expression for the block diagram) upon a version of Graph that I don't see in the documentation over here. That documentation admits three overloads (the following are in my ...
76 views

### numerical precision in output file

I want to write the numerical results of a computation to a file which is to be read in Fortran. The data looks like: ...
318 views

### Extracting values with multiple keys

I want to extract sorted data from a huge database based upon two (or more) keys in a very timely manner. Here is a reproducible toy example for two keys only: ...
204 views

### Numerically solving systems of (first order) linear delay differential equations

I was wondering, how to solve such a system with mathematica? I found the NDsolve function, but in the reference is not mentioned if it is possible to solve a system of equations.
261 views

### Find solutions of equation involving Bessel functions

I'm new in Mathematica and I'm trying to find the solutions of this equation involving Bessel functions $$\eta \frac{ J_{n+1}(\eta a)}{J_n(\eta a)}+\chi \frac{ I_{n+1}(\chi a)}{I_n(\chi a)}=0$$ ...
191 views

### How to color objects from a single .obj file?

How to paint the dolphin, shark and the box with different colors after loading the .obj file into Mathematica? ...
1k views

### Changing the x-axis data range

I have a series of data and Ive ploted them by mathematica.how can I change the x-axis scale?for example instead of "x" being between 0-300, I want to plot my data between 0-2 scale. this is my code: ...
66 views

### Make a table of changes in US coinage

I thought of an innovative use of Mathematica/Alpha that I think Stephen Wolfram would really love, but I can't figure out how to get it to work. The idea is to make a table that would chart the ...
263 views

### How to draw block diagrams as Graph objects?

In the documentation ClosedLoopResponsesWithAPIDController, There is a very nice block diagram. I want to create my own block diagrams similar to this. I clicked on the diagram and pressed ...
229 views

### Dynamic panel crashes Mathematica 10.0.0.0

This answer by @paw have revealed a bug that causes Mathematica v 10.0.0.0 to crash the GUI and kernel. So far the offending code is this: ...
289 views

### Get name of hidden inbuilt functions (like Ticks drawing)

how do I get the name and definition of a builtin Mathematica functions? For instance, I would like to see how default Tick plotting function is implemented. However, it is not clear where it is and ...
353 views

### How to round tick line ends in the plots

I would like to have rounded ticks in my Mathematica plots. They look much better for thick frames ...
368 views

### Using Manipulate to dynamically correct the baseline of a signal

i have data with a baseline and will correct it with a polynomial fit using Manipulate to see immediatly the changes in the resulting spectrum. It works so far, but ...
131 views

### Building Reusable Custom Controls?

I would like to build an application using Mathematica 10. I would very much like to structure the application for maximum maintainability. To this end I would like to segregate controls and user ...