# All Questions

25 views

### Visualization of 3D data by Raster3D and Import

I would like to visualize data stored in an external .txt file. The data is a 3D array of real numbers. I would like to visualize the data by using Raster3D function, but I am not sure what is the ...
40 views

### How to use a symbol with subscript as a variable? [on hold]

I want to use as a whole variable. E means "Ekman",and y means "y direction", both are in literal meaning, not variables, not functions. So that I can write a equation which are calculable and ...
40 views

### How to plot graphs with vertices positioned as spread as possible? [on hold]

The following code, outputs the graph below: graphList = {{1, 2}, {1, 3}, {1, 4}, {2, 5}, {3, 6}, {4, 7}} Graph[UndirectedEdge @@@ graphList] Is there some way ...
388 views

### Colorful and eyecandy text by Mathematica

I want to present my work somewhere and thus I made a Powerpoint presentation. I am wondering if it is possible to make a colorful and stylish text by MMA. For example at the end of my presentation I ...
44 views

### BarChart3D Graph: why there are color and some lines in the xy yz planes? [on hold]

How to remove these odd lines and color in the background? thanks!
51 views

### Monitor progress of ZIP file extraction

Importing a ZIP file containing potentially many individual files in a (custom) format using Import[filename, {{"*"}, "Gaussian"}] takes quite a while. How can I ...
58 views

### Transforming a nested list for textual output

Hello I have a data structure based on lists, with items, subitems and subsubitems, and I want to display a textual output with a description. ...
129 views

### Add reference letters to multipanel figures

I want to create a multipanel figure like that and so I would like to add a letter "A", "B", etc to each of the panel I've created. I usually first create each panel with the letter and then ...
96 views

### Listable functions thread over Associations; is this documented?

Thanks to a somewhat misapplied use of MapThread I learned of this behavior: ...
17 views

### Need a recommendation for managing a database link

I want to make a package which needs to have a external database link. But it is hard for me to have an idea about how to manage the database link. I want the link to be connected as long as I use the ...
100 views

### How does MapThread work with Associations

According to the documentation, MapThread works on Association objects. But it doesn't seem to evaluate the passed function. For ...
28 views

### Tensor product of matrices [on hold]

I want to find an expression 〖 ∑_ij▒〖〖(σ〗_i⊗σ_i)M〗(σ〗_i⊗σ_i) sigma i's are pauli matrices and M is 4x4 matrix.To find this expression is there any program in mathematica?
57 views

### Numerical solution to two non-linear coupled differential equations [on hold]

I am trying to solve two differential equations representing the position of an object in space. I have specified arbitrary initial conditions. ...
127 views

### Integrate wrong for absolute value of trig function

I was trying to get $\int_0^1 \lvert \cos(2 \pi k x) \rvert \,\mathrm{d}x$ for $k \in \mathbb{Z}$, and was surprised by the result (using Mathematica 10.0.1.0): ...
39 views

### Simplify a series expansion including product and multiplication

I have a following expression $$f=\Pi_{i=1}^n \left[ 1 + \frac{1}{t} +\frac{ (m+i)}{t^2} +\frac{ (m+i)^2}{t^3} + \cdots \right]$$ here $m,n,t$ are positive integers. I want to obtain a series ...
81 views

### Getting errors when I try to evaluate code taken from Trott's Mathematica Guidebook for Graphics

I would like to learn how to make high quality images in Mathematica. In my pursuit, I have come across Michael Trott's Mathematica Guidebook for Graphics. I have been trying some of the examples, ...
34 views

### How do I generate a list of delayed rules? [duplicate]

I want a list like this: {x :> Print[1], x :> Print[2], x :> Print[3], x :> Print[4], x :> Print[5]} I tried: ...
65 views

### Providing wrong answer on integral $\int_{-\frac{2}{3}}^{\frac{2}{3}} \left(\text{Ln}\left(\cos ^4(x)\right)+1\right) \, dx$ [on hold]

I tried to evaluate the following in mathematica $\int_{-\frac{2}{3}}^{\frac{2}{3}}{1+\ln \left( \cos ^{4}\left( x \right) \right)}dx$ and got the answer as $0.91905 - 3.94746*10^{-16} I$. However, ...
37 views

### Transforming recursion formulas into a functional form [on hold]

I'm trying to learn what commands Mathematica makes available that allow us to rewrite some formulas that may be in recursive paradigm, and change them to functional paradigm. A reference to a guide, ...
119 views

### How to align rotated BarChart labels?

I'd like to use long text labels for a simple BarChart, but when I apply a rotation to label strings with different lengths the end of the text is no longer aligned ...
166 views

### Compose many Geometric Transformations for 3D Graphics

I'm struggling to understand what would be a good way to compose several geometrical transformations to create a single TransformationFunction to be applied to a ...
84 views

### Can you Plot over some range but apply the “Filling” option over a smaller range? [duplicate]

I would like to shade the area between a function, and a line, but only over a specific range. This range is smaller than the range of the entire plot. The example code and plot below make my goal ...
426 views

### How can I evaluate only a single step of a recursive function?

Let's say have a simple recursive function for the Fibonacci sequence f[0] := 1 f[1] := 1 f[n_] := f[n - 1] + f[n - 2] but I want to see how it will expand in a ...
14 views

### How does this integration make sense? [migrated]

I simply don't understand how integration can lead from: $ds^2 = a^2(t) \frac{dr^2}{1 - kr^2}$ to $s(r) = \frac{\sin^{-1}(\sqrt{k}r)}{\sqrt{k}}$ I appologize, I've never been quite capable of ...
46 views

Here it is: ...
72 views

### Using NDSolve to solve a system of coupled PDEs

I am trying to solve the Gross-Neveu model in one dimension for a specific soliton initial condition. I am trying ...
109 views

### Display full path of current notebook on title bar?

Is there a setting in Mathematica notebook interface to get the title bar to display the full path to the current notebook?
102 views

### How to combine ListPlot and ListPlot3D

Suppose I have a plane drawn by ListPlot3D and I have one intersection of that 3D image drawn by ListPlot. How can I combine ...
69 views

### Connecting to Microsoft SQL with version 10

After upgrading to version 10, functions relying on a connection to a Microsoft SQL database no longer work. When I attempt to open a connection with something like: ...
68 views

### Upload a file using a WolframCloud WebForm

I tried to create a Webform in WolframCloud that asks/browses for a file and then uploads it to a specific folder. The following are the directions I investigated but it does not work: ...
54 views

### Equivalent command to the Maple indets command

This carries on the discussion here and here. I had mistaken Variable[] to give you ALL variables in an expression, but apparently, it is not meant for that. ...
34 views

### Creating a matrix from a list of simultaneous equations

I have a list of n simultaneous equations of the form, w A[n] = (K[n,n+1]+K[n-1,n])A[n] - K[n,n+1]A[n+1] - K[n-1,n]A[n-1] ...
64 views

### Pattern for finding matches that are different [duplicate]

I am trying to solve the following problem. I have tuples of size 3 {{a, b, c}, {a, b, c}, {a, b, c}} I would like to find cases where all the elements in a ...
43 views

### Automating constructor definitions (OptionValue eval time)? [duplicate]

I'm settling in on a programming pattern for "constructors." I can illustrate the pattern with the following example, which defines a constructor newBar for ...
83 views

### 2D smoothing spline interpolation

Does Mathematica have 2D smoothing spline interpolation built in? I requires an interpolation method with smooth first derivatives and cubic bivariate splines fulfill this nicely. In python I would ...
150 views

### Simplifying general solutions of differential equations (driven harmonic oscillator)

Solving general differential equations in Mathematica usually leads to somewhat unsightly results. As an example, consider the solution of the driven, damped harmonic oscillator: ...
87 views

### How can I connect the local minimum-value points between a series of curves by dotted lines?

I have a set of data obtained by NDSolve. After I plot it, I want to indicate some feature of the curves. For example, I want to link the local minimum-value points between these curves by dotted line ...
64 views

### Using expressions in Text

I want to use Text to add some labels to a graph and was wondering if it is possible to use expressions inside Text? Here is a MWE of what I am trying. ...
32 views

### Subsitute symbolic function

I have a have two functions, two recurrance function $x(k+1) = A x(k) + B \tilde{u}(k)$ and $\tilde{u}(k) = (I - \Gamma)\tilde{u}(k-1) + \Gamma u(k)$ Which I have defined as the ...
150 views

### Total much slower in version 10

Compilation nowadays may give very fast functions. Here is an example for finding the sum of a list of machine numbers, just as the built-in function Total: ...
106 views

### How to remove recursion, and write it functional and efficient way?

I wish to implement the following recursion efficiently. ...
59 views

### Conditional replace of a column

Im trying to replace the value in the Nth column of a list if a condition is true, returning the modified list. I've tried modifying the answer from 61219 and been through most of related questions ...
110 views

### Difference between double quotes

I have a notebook and I enter something like PlotLabel->"my label with dynamic number "<>ToString[strange] and I get errors like However, the double ...
70 views

### Find extreme values in a polynomial expression

I have been hunting down and could not find an answer to my question. As I've now been struggling for quite a while and believe it is a simple trick that's preventing me from getting over this ...
51 views

### What does this Append expression do? [closed]

I have to understand some code. A part of it is written below. Can someone explain to me what it does: ...
160 views

### Help recreating a gif

For my math class I am trying to recreate a mathematical gif. Here is the gif I wish to make, http://www.wired.com/wp-content/uploads/2014/09/hexwave.gif. At this point I think I have a 3D function ...
51 views

### Cluster a time series by labels

I have a time series, tab delimited dataset with the following format ...
313 views

### How to calculate position from 3 dimensional acceleration data?

I discussed this problem yesterday with Pickett here. We concluded that the best solution may be just Interpolate and then ...