# All Questions

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### 10.0.2 another Dataset type system (inference?) warning

The warning below seems unrelated to these issues: Did 10.0.2 break some forms for named slots? and 10.0.2 mapping Association to Dataset warning. First noticed w/ ...
20 views

### Trace two DateListPlots?

I currently have two DateListPlots in the same graph, with two different y-axes. I downloaded the package "TwoAxisDateListPlot" to accomplish this with ease. Now I want to be able to trace both of the ...
28 views

### Plotting CSV files with UTC Universal Time

So I have many CSV files in format like this: 2014-12-11T16:13:13.038337Z , 3.90092 2014-12-11T16:14:13.456558Z , 3.89734 2014-12-11T16:15:12.444318Z , 3.90092 I imported a CSV file ...
7 views

### What is the chances of a duplicate in this equation [migrated]

I'm not very good at math; However I have a scenario where I'm trying to find the chance of duplicate for randomly generated data. In a nuttshell I have a "bag" with 62 different items, lets say a ...
50 views

### Localised variable shows up as Global [duplicate]

Why does this local variable show up as Global? ?q Information::notfound: Symbol q not found. >> ...
36 views

### SmoothHistogram inside Show doesn't respect plot range clipping?

You can try this for yourself. Run the following code a couple of times: ...
130 views

### Listable vs Parallel

Are listability and being parallelized the same? In other words, Does parallelizing a listable function which has already a list as of its argument make the computation faster? In the documentation ...
87 views

### Real Numbers in the Wolfram Language

This is more of a request for advice and input than a solution to a programming challenge, but I thought it might be useful to raise here nonetheless. I am wondering if Mathematica and the Wolfram ...
32 views

### Finding periodicity of multidimensional data?

I have a data set consisting of measurements of an $n$-dimensional vector $\mathbf{x}(t)$, at $N$ distinct time points $t_i$. The time points $t_i$ are equally spaced. I need to find the dominant ...
61 views

### Print array with indices

Is there a single function that prints an array together with the indices? I know how to achieve this with Grid[{Range[n],array},Frame->All], but I vaguely ...
17 views

### How to stop a .sh script that calls multiple Mathematica scripts?

When I press Ctrl + C in a linux console running a Mathematica script, it doesn't stop. Instead it brings a console where I am supposed to type either quit, or ...
54 views

### Suspected bug in Integrate

In version 10.0: ...
36 views

### How to change the vertex shape

(Using V9 on Ubuntu) Consider the following code, to create a graph. ...
43 views

### Bspline weights

I change weigts of my points, but nothing has changed. What should i do to solve this problem? ...
37 views

### The change of precision doesn't work in ParallelDo. Is it a bug in Parallel?

Cross-post: http://zhidao.baidu.com/question/2075301703219376588.html Input: ...
67 views

I was just wondering, when I call the CopulaDistribution function in Mathematica, am I calling its cumulative function or its density function? I have looked up ...
14 views

### Find the largest ball where some conditions are true [migrated]

Given a set $\Omega\subseteq\mathbb{R}^n$ and $f:\Omega\to\mathbb{R}^n$, with $f\in C^0(\Omega)$, i need to find the largest ball, centered in $x_0\in \Omega$, where some condition on $f$ ...
36 views

### Help with calculation of the functions and the matrix element of the energy of a quantum dot using Mathematica

best regard I am an undergraduate student in physics, and I'm doing my undergraduate work, I am currently studying the electronic structure of quantum dots using the method discussed in the article ...
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### Cluster entities by a combination of values

I can plot the population of zip codes in NY with something like ...
44 views

### Is there a LogBeta function like the LogGamma?

In a computation, I need Log[Beta[alpha+j,beta-j+n]] of some kind. Is there a LogBeta function built-in to avoid any under/over ...
151 views

### Sum over multiple indices

I would like to be able to enter the following left hand side of an identity. I can write the right hand side (i think) but am not sure about the left. The Left hand side is ...
38 views

### Random Variate from a transformed Distribution

I would like to simulate random variates from a transformed distribution of a joint distribution and a constant. i.e. ...
28 views

### Trouble understanding NeumannValue and Inactive/Formal PDEs

I read all documentation about the Finite Element Method in Mathematica 10, and I read some questions here, but I'm still unable to properly understand how to use the ...
16 views

### Importing sobj sage objects?

I have a sage-math object . It used to be sage could send data to Mathematica directly but the function appears to have broken with Mathematica 9 (http://trac.sagemath.org/ticket/13892). How can I get ...
43 views

### Centering histogram bars over axis values

I'd like to center the bars in my histograms over the correct values of the x-axis. Here is a simplified example: The most common value in the dataset is zero, but glancing at the histogram this ...
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### version 5 & OS X 10.9

Can I use V. 5 mathematica on my MacBook Air with OS X 10.9?I have this old version of Mathematica which I bought when I was using OS X 10.4. I cannot now afford to upgrade to V. 10. I have not ...
88 views

### InverseFourierTransform of simple function takes forever

i'm quite new to Mathematica. I'm trying to do something along the lines of: ...
72 views

### Coefficients of a polynomial in powers of 10

Can I express a polynomial function in Mathematica in power (ScientificForm) ? I was trying: ...
49 views

### Return the incomming expression on false

when I have an expression, that is unknown to mathematica, it is returned exactly the same, as it was called. For example SeeFlyingPigs[1,2] called on the line ...
54 views

### RegionPlot of a function determined from NDSolve solution

I am trying to make use of RegionPlot for the numerical solution obtained via NDSolve. I have seven coupled equations(RG equation) where I want to vary the initial condition for ...
120 views

### Find Unconnected Subregions

If I have a region, how can I identify sub regions that may be disconnected, if any exist? region defines a rectangular region given two diagonally opposed ...
46 views

### solving singular matrix [duplicate]

Hello I have a matrix that is singular, and i wanted to use linear solve to solve it but that doesn't work with mathematica. The matrix given as a list looks like this: ...
34 views

### parsed matrix not deleting elements in adjusted matrix

I have a matrix that has been parsed to delete certain rows and columns, as well as delete certain elements on the diagonal on the matrix. The problem is that it does this in theory when i take the ...
60 views

### How to select a list from a list?

I have a list contains three vertices of a triangle. ...
43 views

### Prevent Simplify from using cot

I have the following problem. I got a huge equation to simplify and in there are numerous $\cos(x)$ and $\sin(x)$ terms and now it happens that Simplify changes terms like $(...+\cos(x)*a+...)$ to ...
55 views

### import from Excel adds a point to each number …How to get rid of it? [duplicate]

I import an excel file ...
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### Get rid of Error Function: How to get rid of sequential appearances of error function?

We have a function as e[t_] :=(E^(-t^2)) Cos[0.1 t] and we must evaluate below integration (However I used the variable x ...
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### BSplineSurface problem

Why does the result of this function is straight line.If problem is in the order of my points, what order is correct? ...
72 views

### Find $\phi$ as function of $\theta$ for Villarceau circle in a torus

May I request for your indulgence, to enable Villarceau circles visualization made by the tip of a line rotating inside a circular torus if possible based on unification of parameters. EDIT2: ...
110 views

### Write Integer powers as products

I need to wirte all occasions of (a+b)^3,Ftp^2, Sin[th]^2, ...etc as (a+b)*(a+b)*(a+b), Ftp*Ftp, Sin[th]*Sin[th], ...etc ...
57 views

### Help to numerically solve ODE

http://math.stackexchange.com/questions/912076/time-period-of-ode Trying to numerically compute and compare the time period of an oscillation with the analytical solution suggested by Robert Israel. ...
27 views

### Using assumptions when calling Simplify from Collect

I am quite new to Mathematica, so please be patient ;) I have a very long equation that I have to sort for powers of a variable called e and that I want to ...
58 views

### Polar Plot Confusion [on hold]

Make a Manipulate that places a green point on the rose r=a+Sin[θ] at the point {r[t] Cos[t],r [t]Sin[t]}. You do this by using ...
70 views

### MathematicaPolarPlot Question [on hold]

Using this as an example PolarPlot[{1,Sin[3 θ]},{θ, 0, 2 π}] Now consider the family of polar curves r=a+Sin[3 θ] as we vary ...
66 views

### Compiling If statement

I have this code: ...
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### Method options for DensityPlot and ContourPlot

What Method options are allowed for DensityPlot and ContourPlot? I am unable to find this ...
34 views

### Background color does not display in InputField unless Appearance option is also specified

I get the same behavior for v.10.0.2 and v.9 with OS X (10.9.5) : No background color is displayed in InputField if I just set properly the option. For example, ...