9
votes
2answers
99 views

Detect Messages within an expression without losing the return value?

I know that Check[expr,failexpr] is a mechanism to catch messages. The problem with it is that if a message is generated within ...
8
votes
2answers
372 views

Association and rudimentary object-oriented programming

Doesn't Association provide us rudimentary object oriented programming via constructs like ...
1
vote
2answers
99 views

Change of basis for a rank 3 Cartesian tensor

I have a Cartesian tensor $\chi_{ijk}$ and I want to express the elements in terms of a new basis to get $\chi_{ijk}^\prime$. The transformation is represented using $a_{ij}$. The tensor transforms ...
2
votes
0answers
37 views

Visualise sets giving some relations on those sets

I'm not very experienced with wolfram, but I'm searching for a function that can basicly do the following. Giving some sets $A,B,C$ and some relations for example $B \subset A$,$C\subset B$. I would ...
1
vote
0answers
91 views

Understanding the use of GradientOrientationFilter to achieve a “brushed” effect

I'm trying to recreate in Javascript a piece of code that appeared here on Mathematica, specifically in this answer. The user Simon Woods suggested an amazingly efficient way of drawing lines over ...
4
votes
3answers
347 views

Changing the x-axis for ListLinePlot with more Lists

I'm fighting with a seemingly very simple problem: I have two lists of data, and want to plot them with ListLinePlot. The two lists are only data-points, therefore ...
4
votes
4answers
193 views

Finding relevant parts in XML document

My question is about a XML document and finding parts of strings. test = Import["C:\\Users\\filename.xml", "XMLObject"] This gives the following output: ...
3
votes
2answers
122 views

How to plot multivariate tabular data

Suppose I have tabular data usual for numeric packages: T = Table[{x, Sin[x], Cos[x]}, {x, 0, 1, 0.1}]; T // TableForm Now I want to plot ...
2
votes
1answer
130 views

defining Associated Stirling numbers of the Second Kind

First, I'm new to Mathematica. Spent my undergraduate programming with Maple and my computer crashed and I lost it. Fortunately, my university offers free Mathematica downloads to students, so here ...
4
votes
4answers
153 views

RegionMember with some tolerance?

Can I specify some tolerance for the new geometric-computation function? RegionMember[Line[{{0, 0}, {1, 0}}], {.5, 0}] (* True *) While: ...
0
votes
1answer
59 views

Shortcut to erase the line one writes on, equivalent to Ctrl+k for pico? [duplicate]

Every time I make a mistake (and I mess up quite often, since I'm new here), I loose time having to use the mouse to delete the traces of my mistakes: the blue vertical lines with the following ...
2
votes
1answer
41 views

Disable locator-removal in LocatorPane

is there a way to DISABLE the ability to remove points with ALT-click (APPLE-click) from a locator pane? I'm writing a code that allows users to manually label objects in an image by connecting two ...
1
vote
0answers
93 views

Request for clarification of Eigensystem::eivn message

What causes the problem of "two eigenvectors associated to one single multiplicity eigenvalue" that I am experiencing? After several transformations to simplify an unwieldy matrix, I end up with the ...
11
votes
3answers
308 views

What is the best way to flatten a linked list with lists as values?

By following the advice on this site I have ended up with a linked list like the following: acc = {{1, 2}, {{2, 3}, {{3, 4}, {{4, 5}, {{5, 6}, {}}}}}}; This was ...
3
votes
1answer
166 views

Recognizing Matching Colors in a Game Grid from a Camera Image

I am relatively new to Mathematica, having taken my first serious dive into it this week. As a fun project to teach myself some of the basics, I've come up with a goal of optimally solving a game ...
1
vote
0answers
40 views

How i can extract a single layer from a SHP file? [closed]

I just import a SHP file that have a series of layers, how can i get just one if i know the name of it?
5
votes
3answers
316 views

Not able to get a solution to a Lagrange Multiplier Equation

I assigned several constrained optimization problems to my calc IV students to solve with Mathematica, but this one is being stubborn. The function to optimize is: f(x,y,z) = y Exp[x-z] with the ...
5
votes
2answers
206 views

Getting the Cumulative Distribution Function of f(x) from a dataset of x

I've a data set $\mathcal{X}$ which consists of randomly generated numbers. Let's say for example data = RandomVariate[ExponentialDistribution[1], 10^4]; My aim ...
6
votes
2answers
160 views

MatrixPlot provides wildly inaccurate PlotLegend?

I noticed something weird with MatrixPlot's PlotLegends -> Automatic behavior- here's a minimal example: ...
2
votes
1answer
67 views

Error with comments inside and expression

I found this strange parsing error with comments inside of an expression in Version 7. And example is {{1, x}, {1, y} (* {1, z (= 5+6)} *)}; It occurs depending ...
4
votes
5answers
233 views

Extracting Coefficients from a List of Sines

I want to extract the coefficients from the following list: list={16.2219 Sin[16.2219 t], 6.60924 Sin[6.60924 t], 13.927 Sin[ 13.927 t], 2.91309 Sin[2.91309 t]} ...
2
votes
2answers
253 views

Legend placement explanation

Could anybody explain, how the coordinates in Placed influence each other? ...
6
votes
2answers
242 views

How to write complex function definitions at run time?

(Posting as a self-answered question to share a technique I discovered) In a certain project, I have many function definitions in which all parameters should be optional and come with default values. ...
2
votes
1answer
200 views

Problems with NDSolve and partial differential equations of several variables

Suppose we have the following partial differential equation: $$ 0 = \frac{ \partial w }{ \partial \tau } + \left( w + \sqrt{ h + \beta } \right) \frac{ \partial h }{ \partial \chi } $$ where $w$ = ...
0
votes
1answer
172 views

Why is my Fourier transformed matrix rotated?

After Fourier transforming and shifting the zero frequency of a matrix, my outcome is rotated by 45 degrees from what it should be. Can anybody spot why? ...
0
votes
1answer
51 views

Error messages from NIntegrate [closed]

I've been trying to work on some integrals (Actuarial Science, for those interested) but somehow this always returns an error for me. ...
0
votes
0answers
78 views

Undocumented options for NSolve

There are many undocumented options in Mathematica's official documentation. Is there a tutorial, or a reference somewhere, that explains in detail the undocumented uses of ...
0
votes
0answers
35 views

How to plot morphological stripe near the mouse-clicked position in an image? [duplicate]

I tried to use EdgeDetect and MorphologicalComponents to get the image edge elements. When I clicked on an image, I want the edge element nearby to be highlighted or plotted. Here is my code. Two ...
8
votes
2answers
729 views

What is special about 70.329862 and InputField and Number and Dynamic?

Is this a bug (happening in V9 and V10 Windows, Linux) or not? It only happens for certain numbers and you need Number in InputField. ...
2
votes
3answers
132 views

Can you compute more terms in this sequence?

I am trying to identify a sequence related to the von Mangoldt function matrix. Since I believe/conjecture that the columns in the matrix have period lengths as in this sequence b: ...
3
votes
0answers
113 views

StyleSheet for custom application

I'm working on a package that needs to be installed into an arbitrary, "non standard" path (i.e., not $BaseDirectory or ...
1
vote
1answer
137 views

How to Use Mathematica as a C/C++ compiler [closed]

I am learning C/C++ programming, but I don't wannna install new software for compiling C/C++, so, is there any possibility to compile C/C++ code using Mathematica? Here is the first program I want to ...
0
votes
0answers
84 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 ...
1
vote
1answer
78 views

How to plot graphs with vertices positioned as spread as possible? [closed]

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 ...
1
vote
2answers
433 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 ...
3
votes
0answers
87 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 ...
1
vote
1answer
76 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. ...
9
votes
2answers
204 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 ...
12
votes
2answers
179 views

Listable functions thread over Associations; is this documented?

Thanks to a somewhat misapplied use of MapThread I learned of this behavior: ...
1
vote
0answers
35 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 ...
7
votes
3answers
155 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 ...
1
vote
0answers
106 views

Numerical solution to two non-linear coupled differential equations [closed]

I am trying to solve two differential equations representing the position of an object in space. I have specified arbitrary initial conditions. ...
5
votes
0answers
228 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): ...
1
vote
1answer
137 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 ...
2
votes
1answer
141 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, ...
0
votes
2answers
49 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: ...
2
votes
2answers
96 views

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

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, ...
9
votes
0answers
174 views

How to align rotated BarChart labels? [duplicate]

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 ...
10
votes
1answer
286 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 ...
2
votes
3answers
179 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 ...

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