# All Questions

99 views

### HSQLDB database webserver access

I need a database that runs its connection over http and not tcpip. The "HSQLDB (webserver)" jdbc driver should be able to do just that. The following code launces the webserver but the OpenSQLConnect ...
72 views

### Can I define a “total Curl” operator similar to a “total derivative (Dt)” operator? [duplicate]

I am trying to take the curl of a vector field. A={A1,A2,A3} B=Curl[A,{x,y,z}] This yields {0,0,0} because Mathematica ...
228 views

### Possible bug: Quantity[2,“meters”] returns 2 None meters

I'm using 10.0 for Linux. Trial 1: Quantity[2,"meters"] 2 None meters Trial 2: Quantity[2,"Meters"] 2 meters Trial 3: ...
117 views

### How do I get all the roots within a certain range for an equation? [duplicate]

I wish to find ALL the roots of the following equation $x \tan(ax) - c = 0$ within a range, where a and c are constants I control. I've been using ...
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When I plot ...
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### Export as Table with alignment?

I have a table in Mathematica as a list of lists. How to export the table, and force Mathematica to insert as many spaces as needed between columns so that columns are aligned? For example, ...
206 views

### NSolve fails to solve a nonlinear equation

Mathematica can not solve this: g = 9.82; ω = 0.5; h = 5; y0 = 1; v = 0; τ = 0; NSolve[h + v t - (g t^2)/2 == y0 Sin[ω t], t]; The error code is: ...
54 views

### BarLegend rasterized in EMF and EPS export

A while ago you guys gave me a splendid workaround to the rasterization bug in exported BarCharts. Now I noticed that the workaround is not working for BarLegends. My problem is, that ...
108 views

### Integrate over implicit 1D region: works for algebraic but not transcendental equation?

QUESTION How come this works: NIntegrate[1, {x, y} ∈ ImplicitRegion[{x == y^3, x <= 1, x >= 0}, {x, y}]] But this fails: ...
161 views

### Convert recursive RegularExpression to StringExpression?

Consider the following expression for matching balanced brackets: ...
117 views

### Export generated mesh

Say I have generated a mesh using ToElementMesh, following one of the examples here: http://reference.wolfram.com/language/FEMDocumentation/ref/ToElementMesh.html ...
122 views

### NSolve on bounded domain

I don't expect NSolve[] to be able to obtain all solutions in generalfor example. In principle there should be an algorithm that finds all solution to $f(x)=0$ for ...
65 views

### Transform List from {a,a,b,b,b,c} to {{a,2},{b,3},{c,1}} [closed]

The title pretty much says it. I want to map over the solutions returned by Solve but want to avoid calculating the same thing over and over again. e.g. ...
122 views

### Automatically zoom-out on ListPlot?

Mathematica chooses the PlotRange for a ListPlot such that the lowest x-value lies on the y-axis and vice versa. Because of this these points often are difficult to find. I could increase the dot ...
131 views

### Meshing of a cube

I want to mesh a cube and what I use is ToElementMesh[Cuboid[ {-1, -1, -1}, {1, 1, 1}]]. This creates a regular grid of the cube. Is there a way to specify that ...
103 views

### Packages for Semidefinite programming

This question has already been asked here. I am not sure, whether I should have asked this question as a comment of an old question or in the general programming forum of stackexchange. Moderators ...
139 views

### Numerical Integration different in Mathematica version 9 and 10 with same options

I have noted that the same function with the same settings gives me different results in Mathematica version 9 and 10. This involves integrating numerically interpolating functions and so on. Here a ...
130 views

### Manipulate of graphics + ParametricPlot [duplicate]

Edited at bottom - I think the problem is my unwise expectation to overlay Plot___ over Graphics objects and magically have them scale. I have an entry-level manipulate that shows how a cycloid is ...
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### How best to embed various cell groups into a latex project?

I'm an author and a coder. I want to reference various parts of my notebooks in my latex project. I've tried doing the following, using a post on the latex side of this problem. I'd like to solve it ...
101 views

### Creating an autokey cipher function

Can someone help me with putting what I can say in words into code. I want to create autokey encrypt and decrypt functions (just wanting help encrypting and then can figure out decrypting). Everything ...
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### How to solve this equation? or get the numbers of solutions of the function?

I have a function like this.. $$f[k]=\int_0^\infty Exp[-ax]x(Cos[bx])^{2}BesslJ[0,kx]dx$$ I want to know how many local maximuns this function has.. So I try to get the derivative of f[k]  ...
73 views

### Black Ovals appeared in my Mathematica notebook [duplicate]

I copied and pasted something from another Mathematic notebook and started getting the same black ovals seen in this question: Colored marks appearing in notebook input text? The suggestion to turn ...
76 views

### Is there a documentation generator for Mathematica?

I'm looking for a way to document the functions of my packages inline, preferably inside comments. There should be a Doxygen type tool for this that takes comments and that generates html from markup ...
30 views

### Changing cell style in V10.0.2 [duplicate]

In Mathematica 10.0.0 and 10.0.1 I used to change cell style by putting the cursor anywhere in the cell and then invoking one the short cuts (Alt + 1, 2, 3, 4, 5, 6, 7, 8, 9) to change cell style ...
123 views

### How to move a cell up or down with a keystroke?

It is very useful during refactoring to move lines around. All popular IDEs or text editors have this feature (PyCharm, Vim, Sublime, etc..) for example in Xcode you press: ⌥⌘[ or ⌥⌘] to move lines up ...
95 views

### Does FindFit use symbolic differentiation?

Does FindFit use symbolic differentiation when optimizing by least squares a non-linear function?
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### How to import (from a table file) only rows with a specific element in a given position using Import?

I have a large file containing a table. To be specific, the table columns are aligned by spaces, and the rows are terminated by newlines. I want to import only specific rows from this table. For ...
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### How to specify alignment of columns when exporting a table using Export, and how to use spaces instead of tabs?

I have a table in list representation. How can I export it, specifying that some columns must be right-aligned and others left-aligned? Morevoer, columns should be space-separated (with an appropriate ...
71 views

### How to list indices of list elements that meet a condition? [closed]

Is there a tidy way to create a list of the indices of elements of a list that meet specified conditions? This method gets the job done, but it's clumsy and not conducive to nesting: ...
127 views

### StreamPlot segmented lines

I am plotting this vector field: ...
69 views

### Derivative after numerical Integration

So I have a function that I want to numerically integrate with respect to temperature, so the integral changes depending on the value of temperature being used as it is one of the bounds. After ...
112 views

### Simplifying terms in a Sum expression

I have a sum in the form of pure function s = Sum[f[k], {k, 0, # - 1}] & of perhaps complicated terms f[k]. The terms ...
187 views

### FindFit “is not a real number” error when fitting a parametric function to the data

I am using Mathematica's FindFit function to fit a parametric solution to my data and I am getting the error ...
146 views

### Plotting an extremly large output

I'm trying to plot the solutions of this determinant: ...
77 views

### Strange extrapolation in ListContourPlot?

I have some Table of {x,y,z} values (energy as a function of radial and azimuthal frequencies in a galaxy if you care to know): ...
109 views

### Using a dataset of PredictorFunctions

I have been working with a dataset of predictor functions -- mainly so I can have more insight in to what the functions are doing and how they behave. Where I am struggling is using ...
74 views

### Sketch Probability density function [closed]

My question is : Suppose that the PDF of a random variable X is as follows: \begin{equation*} f(x) = \begin{cases} ce^{-2x} & \text {$x > 0$}\\ 0 & \text {otherwise}\\ ...
58 views

### Is there a way to combine VertexLabeling->True and VertexLabels/Tooltip in TreePlot?

Basically, I'm trying to make Mathematica give me a tree with names inside the rectangles like so: ...while also having the properties of VertexLabels or Tooltip, which lets me place my mouse over ...
119 views

### Best choice for an infix join operator?

I would love some advice for what symbol to use and best implement it? ...
185 views

### How can I improve NumberString?

I would like to test strings to see if they represent numbers. This should include number representations with precision marks and scientific notation. NumberString ...
74 views

### How to get only the directories (not the files) inside the current directory? [duplicate]

FileNames[] lists all the files and directories inside the current one. How can I list only the directories?
97 views

### How to implement a live-searchable table view? [closed]

Everyone with a mobile device is familiar with table views, searchable scrolling tables where rows have multiple elements like images and text, and are populated from some data source. Since a ...
177 views

### How to check whether elements of a list meet a condition without generating the whole list first?

I have to find the number of elements satisfying a given condition from the set: Tuples[Tuples[Tuples[{0,1},n],n],m] The condition for $n=3,m=3$ is: ...
89 views

### FinancialData[], what does “members” include?

I am doing some manipulation of historical stock prices on the NYSE. I want to go through each stock. To find the number of entities on NYSE, one can use: ...
710 views

### A better “VisibleSpectrum” function?

Since ColorData["VisibleSpectrum"] is wrong, I would like to have a more accurate function to use. Can this information be extracted from Mathematica itself?
141 views

### problem exporting eps figures since mathematica 10

I am having trouble when exporting eps figures since I have upgraded to mathematica 10.0 in linux. Basically the text in the frame label and in the frameticks come out bad. The letters are much to ...
40 views

### Custom function call does not return a value

I have written the following code to implement a PCA algorithm. It works on standalone basis, however when I put it into a function that is called the following ...