# All Questions

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95 views

### What does that output of Sum mean?

I made the computation ClearAll["Global*"]; r = Sum[1/2^(k*n/(k + n)), {k, 1, 2*n}, Assumptions -> n ∈ Integers && n > 0] and got ...
136 views

### Mathematica lexer: Symbols and UTF-8

Did you ever wonder why here on our site, there is a highlighting difference between f[argX_] := 1; and f[argα_] := 1; ...
624 views

### What algorithm is Mathematica using to find the smallest eigenvalue so quickly?

My question is what kind of black magic is Mathematica doing to obtain the correct answer so quickly compared to other programming languages? Details: I've written a Mathematica notebook to find the ...
156 views

### How can I disable system updates only?

Suppose I'm quite happy with my current Mathematica installation and wish to keep the system in its current form just reliably working. Since there were already at least two cases[1,2] when a lot of ...
131 views

### Clarify when to use Style vs Directive vs List

I am confused about when to use a simple list of style options, the Directive function or the Style function. As shown below, ...
133 views

### Code request: Make “copy formatted code” bulletproof

With the GeneralUtilitiesPrintDefinitions functions comes a usable code formatting engine. On this site, most of the time we share code. I believe it would be ...
158 views

### Alternatives and the Flat attribute

When a head has the attribute Flat then the pattern matcher is able to pick out a sublist of its arguments, even though the structure doesn't match: ...
376 views

### How to wrap a crumpled paper over a surface?

My initial question was about the making of a crumpled paper. After reading this article suggested by J.M. and little more browsing (kind of random walk you do on a Saturday) I thought about expanding ...
169 views

### Unix-like reference to parent and root Association?

Is there a syntax or function to reference parent and root when querying nested Associations similar to Unix' ".." and "/", eg "cd ../../mydir". ? Here's a typical application of the root construct....
477 views

### How to speed up calculations on big symbolic matrices?

this is my first time posting something on a community of the StackExchange platform, so please feel free to correct me if I'm doing something wrong. :) Additionally you should probably know that I'm ...
224 views

### Find sequence of sequences?

There is a function FindSequenceFunction in Mathematica, that can identify a sequence of integers based on a few first elements. But what if I have a set of finite ...
393 views

### How to read and write data to open socket?

I am trying to open connection with socket. I am using this: ...
297 views

### Customized StepSize control in unconstrained gradient-descent optimization

I have a type of minimization problem I frequently solve that involves warping a large 2D triangle-mesh (~25,000 vertices) to fit a model. In the mesh, vertices carry the empirical measurements (each ...
736 views

### How to bundle JLink with Java application using apache maven

The context: I am planning to visualize some results from my MMA code using D3.js. So I wanted to make a simple REST api using the light weight SparkJava framework. Given my fairly nonexistent ...
802 views

### DSolve returns an answer that is not a solution

Investigating DSolve misses a solution of a differential equation, I came across this odd behavior of DSolve. The following DSolve command returns an answer to the ...
160 views

### Mathematica is getting slow when repeatedly calling an external program

I found a strange phenomenon that Mathematica is getting slow when I repeatedly called an external program by using ReadList. For example, the following code will display a significant increase of CPU ...
334 views

### Mathematica and POV-Ray workflow: ListContourPlot3D

I have the following function describing a molecular electronic Orbital. ...
322 views

### Efficient image stacking

I have a list of lists of images that I would like to stack and create mean images for each list of images. Images are .jpg files 2592x1944 pixels large. Each list ...
278 views

### How to make Graphics3D with multiple lighting sources being rendered faster

I have a very "precise"(through setting "SpherePoints") Sphere illuminated by hundreds of random color lighting sources. The ...
337 views

### Setting non-standard ImageResolution for EMF export as default

Mathematica has a bug in that BarCharts and ListPlots with Filling will export as a ...
534 views

### How to style and position VerticalCallouts and RadialCallouts

Here is a pie chart with a labels placed with a "VerticalCallout" ...
161 views

### Workaround for DSolve in V 12 when it gives undefined as solution to 1D heat PDE?

Reported to WRI CASE: 4278450 Comparing the following, all done from clean kernel The strange thing is that V 12 can solve this same PDE without the assumptions ...
154 views

### How to link C++ code through the new compiler in V12?

The Advanced Compilation Topics talk in the WTC 2018 shows that one can easily link C++ code through the new compiler technology. This feature seems very useful as one can easily load existing C++ ...
203 views

### Mathematica 12 crashes upon taking the Log of a double series

I recently upgraded from Mathematica 10.4 to 12.0. Unfortunately, I am now experiencing crashes with code that was stable in 10.4. The code involves extensive manipulation of the Series function ...
96 views

### What's the difference between these formats?

Unfortunately, the documentation does not give a substantive explanation of the differences between these formats: WDF vs WXF WLNET vs WMLF M vs WL - was answered here: What is the difference between ...
508 views

### From where to learn finite element method?

Can anyone reccomend me a book or site for learning finite element method with mathematica, besides wolfram language official site, https://reference.wolfram.com/language/FEMDocumentation/tutorial/...
211 views

### How to segment rectangular photographs on a table?

Given an image of a table with photographs (take from any angle), I'm trying to extract the photographs and correctly align them into perfect rectangles. There are four steps to the algorithm: Detect ...
113 views

### 'Visibility' of Dynamics in TabView with respect to SynchronousUpdating

Bug introduced in 11 or earlier and persisting through 12.0.0 CASE:4076464 Example 1 ...
147 views

### PatternSequence, Optional and _Symbol

Bug introduced in 9.0 or earlier, partially fixed in 10.1 and persisting through 11.3 [CASE: 4075992] confirmed Note: See (72290) for the fixed part of the bug. Consider the following example: <...
98 views

### Why does the kernel quit if I want to use minus a sum that I converted from a list?

Using Mathematica 11 when I define a list yy = {x*43, 32*y}; and then convert it to a sum yy[[0]] = Plus; yy I get, as ...
431 views

### How to plug holes in an Image (with partial convolutions)?

NVIDIA recently published a new way to reconstruct images with holes. They use a new type of convolutional layer which is described in the paper Image Inpainting for Irregular Holes Using Partial ...
95 views

### LibraryLink: How to read from a Mathematica stream in C?

Mathematica has a flexible streams interface. Functions like Read can read from a "stream" that may be backed by a file, pipe, string, network resource, etc. We can ...
283 views

### Create vtk file of ParaView from Mathematica [FEM post-processing]

I'm doing FEM in Mathematica and want to visualize the results in Paraview (e.g., create a video of the displacement field). Now I have the element mesh, the displacement and stress fields. How can I ...
267 views

### Possible Symbolic Integration Bug

Bug introduced between 5 and 8 and persisting through 12.0. I think I may have found a bug, and want to verify is this reproducible in other versions and platforms and not a mistake of mine. I ...
112 views

### Compile M11.1-compatible LibraryLink libraries using M11.2

WolframLibraryVersion, defined in WolframLibrary.h, was bumped from 3 to 4 in Mathematica 11.2. This causes libraries compiled ...
173 views

### What's the Wolfram Cloud missing?

So I was building myself a quick little home page in Mathematica today and I'm hosting it in the Wolfram Cloud because that's a nice easy thing to do. One thing I was wondering about what standard web ...
104 views

### URL functions overload

All these functions seem capable of doing the same things: Import, URLFetch, URLSave, ...
164 views

### FindVertexCut & FindEdgeCut

Bug introduced in 9.0 and persisting through 12.0 FindVertexCut is new in 9.0. Note: Before 10.3, the bug can be reproduced by wrapping the first argument in <...
247 views

### Creating compiled search TRIE file for argument string completion

I'd like to generate a compiled search TRIE file (like those found in \$InstallationDirectory\SystemFiles\FrontEnd\SystemResources\FunctionalFrequency\) to help ...
178 views

### Why is 13 the smaller height dimension of a Graphics?

It seems that you cannot get a Graphics image with a height dimension less than 13. Trying to draw something and then asking for ...
121 views

### Autocomplete is too greedy with the mouse

I have a frustrating user experience problem in Linux; a common occurrence when using the notebook might go like: I have, for some reason, used the mouse (e.g. to place the cursor) and then move the ...
195 views

### Possible Bug with Options in DelaunayMesh

Bug introduced in 10.2 and persisting through 11.1 Update: It turns out after some testing, none of the Options work in ...
286 views

### Wrapping text around pasted graphic

I would like to use Mathematica to create all my documents for my high school math class. I cannot, however, find a way to copy and paste a diagram (let's say from Geogebra) and then place it where I ...
891 views

### Which IDE do you use for Mathematica development?

After more than a year I revisited the IntelliJIDEA plugin but that still seems to be 'just' an editor, of course there is the Mathematica Workbench but why are there so few improvements? Version 10. ...
596 views

### How to generate a random flow graph?

A flow graph is a rooted directed graph that the root reaches all other vertices. I need to generate a random flow graph in Mathematica. My idea is to use ...
206 views

### RuntimeTools insight?

Does anyone happen to have some more complete insight into the RuntimeTools package that is used by Debug and Workbench? I ask ...
569 views

### J/Link doesn't work with Java 8?

I have some code that successfully uses J/Link (well... until today when something I was doing something with it that crashed the JVM, so), and I recently tried running it under Java 8. I then get a ...
773 views

### Dataset in Mathematica 10.0.1

Wolfram pages "Mathematica Quick Revision History" in Mathematica 10.0.1 release says: "New operators and compositions of operators enabled for associations functions such as Dataset and Query" ...